I.Nalbantis@itia.ntua.gr
+30-210 7722713
Evaluation of Management of the Water Resources of Sterea Hellas - Phases 1, 2, 3
Duration: December 1990–December 2000
Commissioned by: Directorate of Water Supply and Sewage
Contractor: Department of Water Resources, Hydraulic and Maritime Engineering
Project directors: D. Koutsoyiannis, Th. Xanthopoulos
Principal investigators: P. Marinos, I. Nalbantis
The main objectives of the research project are the evaluation and management of the water resources, both surface and subsurface, of the Sterea Hellas region, and the systematic study of all parameters related to the rational development and management of the water resources of this region. Another objective of the project, considered as an infrastructure work, is the development of software for the hydrological, hydrogeological and operational simulation of the combined catchments of the study area. The development of the software and, at the same time, the development of methodologies suitable for the Greek conditions will assist in decision-making concerning the water resources management of Sterea Hellas and of other Greek regions. The project also aims at the improving of the cooperation between the National Technical University of Athens and the Ministry of Environment, Planning and Public Works. This is considered as a necessary condition for the continuous updating of the project results as well as for the rational analysis of the water resource problems of the Sterea Hellas region. The whole project is implemented in three phases. The objective of Phase 1 (December 1990 - November 1992) is the collection and the organising of the surface water data and the development of hydrological simulation programs. The themes of Phase 2 (November 1993 - October 1995) are: (a) the conversion of the databases of the previous phase into the new computer environment based on Unix and Windows workstations; (b) the conversion of the computer programs for statistical processing of hydrologic data into the new computer environment; (c) the development of software for hydrologic data processing and the processing of the Sterea Hellas data; (d) the development of a geographical information system for hydrological and hydrogeological information; (e) the review of existing studies regarding water uses; (f) the collection, evaluation and organising of hydrogeological data; and (g) the hydrogeological study of selected watersheds. Finally, the themes of Phase 3 (November 1996 - December 2000) are: (a) the completion of the information systems of the previous phases, which concerned hydrological and hydrogeological information, by including two additional levels of information related to the water uses and the water resources development works; (b) the development of methodologies for optimising the hydrosystems operation and the construction of integrated simulation and optimisation models for the two major hydrosystems of the study area (Western and Eastern Sterea Hellas); and (c) the integration of all computer systems (databases, geographical information systems, application models) into a unified system with collaborating components.
Systematisation of the raw data archive of surface and subsurface waters of the Ministry of Agriculture in Thessalia
Duration: February 1997–January 1999
Commissioned by: Department of Hydrogeology, Boreholes and Mathematical Models
Contractor: Department of Water Resources, Hydraulic and Maritime Engineering
Project director: D. Koutsoyiannis
Principal investigator: I. Nalbantis
The project aims at the modernisation of the archive of surface and subsurface water related data of the Ministry of Agriculture in the Thessalia region (mainly data on quantities of the drafts from both surface waters and groundwater pumped from public or private boreholes). It also includes the data organisation into a geographical information system and the data evaluation and processing, from which the evapotranspiration of the area is estimated using semi-empirical methods.
Upgrading and updating of hydrological information of Thessalia
Duration: May 1996–March 1997
Commissioned by: Directorate for Acheloos Diversion Works
Contractor: Department of Water Resources, Hydraulic and Maritime Engineering
Project director: D. Koutsoyiannis
Principal investigator: I. Nalbantis
The project includes the updating of existing archives of hydrometeorological data with the new measurements, and the upgrading of the databases using the new computational environment of the Hydroscope project. It also includes data processing and analysis in order to obtain a reliable and consistent hydrometeorological data set. The databases are linked to a geographical information system that is used for the processing and the visualisation of information. Based on this processing, the basic parameters of the water potential of the area are estimated and their geographical distribution is studied with emphasis on the recent persistent drought.
A pilot study for the water resources management of the Epirus water district
Duration: September 1991–September 1993
Commissioned by: Directorate of Water and Natural Resources
Contractor: Department of Water Resources, Hydraulic and Maritime Engineering
Collaborators:
Project director: Th. Xanthopoulos
Principal investigator: I. Nalbantis
The main objective is to obtain an insight of the interrelation of the water balance components of the Epirus water district. The methodology is based on an earlier project regarding the water resources of the Louros and Arachthos watersheds. The role of the research team of the National Technical University of Athens is to supervise the project and evaluate its results at each stage of the project.
Development of a Geographical Information System and an Internet application for the supervision of Kephisos protected areas
Duration: April 2008–March 2009
Budget: €30 000
Contractor: Department of Water Resources and Environmental Engineering
Project director: N. Mamassis
Principal investigator: N. Mamassis
The main purpose of the system is the supervision of the protected areas in Kephisos river basin. Using the applications that will be developed, the staff of Kephisos Institution will achieve the real time recording of various activities that are built up inside the limits of protection belts. Specifically, three main applications will be developed: (a) A Geographical Information System (GIS) (b) An General Positioning System Application (GPS) (c) An Internet application
Investigation of management scenarios for the Smokovo reservoir
Duration: November 2005–December 2006
Budget: €60 000
Commissioned by: Special Directorate for the Management of Corporate Programs of Thessaly
Contractor: Department of Water Resources, Hydraulic and Maritime Engineering
Project director: D. Koutsoyiannis
Principal investigator: N. Mamassis
Programme: Επιχειρησιακά Σχέδια Διαχείρισης Δικτύων Σμοκόβου
Integrated Management of Hydrosystems in Conjunction with an Advanced Information System (ODYSSEUS)
Duration: July 2003–June 2006
Budget: €779 656
Commissioned by: General Secretariat of Research and Technology
Contractor: NAMA
Collaborators:
Project director: D. Koutsoyiannis
Principal investigator: A. Andreadakis
Programme: ΕΠΑΝ, Φυσικό Περιβάλλον και Βιώσιμη Ανάπτυξη
The project aims at providing support to decision-making processes within the direction of integrated management of water resource systems at a variety of scales. Several methodologies and computing tools are developed, which are incorporated into an integrated information system. The main deliverable is an operational software package of general use, which is evaluated and tested on two pilot case studies, concerning hydrosystems in Greece with varying characteristics (Karditsa, Dodecanesus). The end-product of the project is a software system for simulation and optimisation of hydrosystem operation, as well as a series of separate software applications for solving specific problems, aiming at producing input data to the central system or post-processing of the results. The project includes eleven work packages, eight for basic research, two for industrial research and one for the pilot applications.
Classification of quantitative and qualitative parameters of the water resources of Greece - Phases 1 and 2
Duration: February 1996–April 2003
Budget: €216 000
Commissioned by: Directorate of Water and Natural Resources
Contractor: Department of Water Resources, Hydraulic and Maritime Engineering
Project director: D. Koutsoyiannis
Principal investigators: A. Andreadakis, D. Mamais
The scope of the project is the classification of the existing information related to water quantity and quality in the water districts of Greece, using geographical information systems. The project part related to water quantity aims at the development of a methodology for establishing a water balance between supply and demand and extracting the most important summary characteristics that are then entered into a geographical information system. The methodology is applied at a water district scale, using information based on existing studies. The project part related to water quality aims at the characterisation of the rivers, lakes and aquifers based on the water quality characteristics, and the water uses and requirements. The characterisation is based on the classification of critical quantity parameters that have been measured and includes the use of a geographical information system. The project was elaborated in two phases. The first phase was implemented in 1996, and its objective was the development of methodologies, the analysis of the 10 water districts and their relationships and the creation of maps. In collaboration with other authorities (Ministry of Development, Institute of Geology and Mineral Exploitation, Centre for Research and Planning), the institutional and administrative status, the international environment and the water policies, were investigated. Finally a first approach towards the integrated management of the water resources of the country was attempted. The second phase was implemented in 2002-2003, and aims at the completion of the study, by incorporating the 4 remaining water districts, a more analytical approach regarding the water management at a country scale and the update of results of the first phase.
Evaluation of Management of the Water Resources of Sterea Hellas - Phase 3
Duration: November 1996–December 2000
Commissioned by: Directorate of Water Supply and Sewage
Contractor: Department of Water Resources, Hydraulic and Maritime Engineering
Project director: D. Koutsoyiannis
Principal investigator: D. Koutsoyiannis
The main objectives of the research project are the evaluation and management of the water resources, both surface and subsurface, of the Sterea Hellas region, and the systematic study of all parameters related to the rational development and management of the water resources of this region. Another objective of the project, considered as an infrastructure work, is the development of software for the hydrological, hydrogeological and operational simulation of the combined catchments of the study area. The development of the software and, at the same time, the development of methodologies suitable for the Greek conditions will assist in decision-making concerning the water resources management of Sterea Hellas and of other Greek regions. The project also aims at the improving of the cooperation between the National Technical University of Athens and the Ministry of Environment, Planning and Public Works. This is considered as a necessary condition for the continuous updating of the project results as well as for the rational analysis of the water resource problems of the Sterea Hellas region. The specific themes of Phase 3 are: (a) the completion of the information systems of the previous phases, which concerned hydrological and hydrogeological information, by including two additional levels of information related to the water uses and the water resources development works; (b) the development of methodologies for optimising the hydrosystems operation and the construction of integrated simulation and optimisation models for the two major hydrosystems of the study area (Western and Eastern Sterea Hellas); and (c) the integration of all computer systems (databases, geographical information systems, application models) into a unified system with collaborating components.
Classification of quantitative and qualitative parameters of the water resources of Greece using geographical information systems
Duration: February 1996–September 1996
Commissioned by: Directorate of Water and Natural Resources
Contractor: Department of Water Resources, Hydraulic and Maritime Engineering
Collaborators:
Project director: D. Koutsoyiannis
Principal investigator: A. Andreadakis
The project part related to water quantity aims at the development of a methodology for establishing a water balance between supply and demand and extracting the most important summary characteristics that are then entered into a geographical information system. The methodology is applied to characteristic areas (water districts) of Greece with adequacy of information (based on existing studies). The project part related to water quality aims at the characterisation of the rivers, lakes and aquifers based on the water quality characteristics, and the water uses and requirements. The characterisation is based on the classification of critical quantity parameters that have been measured and includes the use of a geographical information system.
AFORISM: A comprehensive forecasting system for flood risk mitigation and control
Duration: June 1991–May 1994
Budget: 17 300 000 DRS (about €83 900)
Commissioned by: DGXII / FP6-SUSTDEV-2005-3.II.1.2
Contractor: University of Bologna
Collaborators:
Project director: Th. Xanthopoulos
Principal investigator: D. Koutsoyiannis
Programme: EPOCH
The aim of this project is the development of a comprehensive flood forecasting system and the study of alternative management policies intending to flood risk mitigation. The Greek research team contributes to AFORISM in the following tasks: (a) the analysis of intense rainfall events and their classification by weather type as well as the modelling of intense rainfall and the production of alternative hyetographs of temporal evolution of rainfall; (b) the comparison of the alternative rainfall-runoff models, using multiple time steps in modelling rainfall-runoff and applying it to Greek hydrological basins. The contribution of the other research teams deal with: (a) the forecasting of spatial-temporal evolution of rainfall using limited area models; (b) the development of optimisation models in order to mitigate flood risks; (c) the development of an expert system for flood management; (d) the development of a geographical information system for visualisation of the evaluation of flood and its consequences; and (e) the integration of the forecast and control system in the Reno basin (Italy).
Hydroscope: Creation of a National Databank for Hydrological and Meteorological Information
Duration: January 1992–December 1993
Budget: 394 238 400 DRS (about €1 600 000)
Commissioned by:
Contractor: Department of Water Resources, Hydraulic and Maritime Engineering
Collaborators:
Project director: D. Koutsoyiannis
Principal investigators: M. Aftias, D. Koutsoyiannis
Programme: STRIDE
The main objective of HYDROSCOPE is the creation of a modern information infrastructure for the hydrological cycle in Greece. Specifically, it aims at organising and systematising the hydrological, hydrogeological and meteorological information using the capacities that are provided by the modern methods and techniques of computer science and telecommunications. The database, which will be built, will contribute to the reliable programming, planning and management of the water resources of the country, the mitigation of phenomena like flood and drought, the evaluation of hydroclimatic parameters and their effects to the natural and biological environment, the diagnosis of climatic changes as well as the prediction and the control of the air pollution and the groundwater and surface water pollution. The development of a unified synergistic network, the information exchange and the co-ordination of the activities of the participating organisations, which are involved with the components of the hydrological cycle (Universities, Research Centres, Ministries and Services) as well as the reorganisation and standardisation of the hydrometeorological networks' function are considered as indirect but essential benefits. The programme includes: (a) hardware equipment, to install a network with 13 major nodes (RISC Workstations with Unix operation system) in Athens and Thessaloniki, local networks of PCs in each node, private high speed wide area network using routers and leased telephone lines, (b) infrastructure software, and specifically, distributed relational data base and graphic environment for applications' development, and (c) application software, and specifically, a distributed database system and applications concerning the input, the supervision and the processing of data in a graphic environment. This distributed database system provides firstly, the autonomy of each participant in managing data and secondly, a transparent, relatively to the data position, access. In addition, the project includes the locating of the available hydrological, hydrogeological and meteorological data that is maintained by the participants and the determination of the volume, the form and the reliability of measurements. Finally, a significant part of HYDROSCOPE deals with the development and the standardisation of methodologies regarding the processing as well as the pilot data entry of a part of the hydrological, hydrogeological and meteorological information aiming at the testing of the methodologies and systems.
Engineering consultant for the project "Water supply of Heracleio and Agios Nicolaos from the Aposelemis dam"
Duration: October 2000–December 2002
Budget: €1 782 000
Commissioned by: Ministry of Environment, Planning and Public Works
Contractor: Aposelemis Joint Venture
Estimation of losses from DXX canal in the irrigation network of Lower Acheloos
Duration: January 1999–December 1999
Commissioned by: Division of Land Reclamation Works
Contractor: NAMA
Concerted actions for the sector of environment in Santorine and Therasia islands
Duration: November 1998–December 1998
Commissioned by: Cohesion Fund EU
Contractors:
Engineering study of the hydraulic project of old and new river bed of Peneios in Larisa
Duration: January 1997–December 1997
Commissioned by: Ministry of Environment, Planning and Public Works
Contractors:
Water resources management of the Evinos river basin and hydrogeological study of the Evinos karstic system
Duration: January 1996–December 1996
Commissioned by: Directorate of Water Supply and Sewage
Contractors:
Integrated study of the environmental impacts from Acheloos diversion
Duration: September 1995–December 1995
Contractor: Directorate for Acheloos Diversion Works
Collaborators: Ydroexigiantiki
Engineering study for improving the water supply of Athens with the construction of a dam at the Evinos River
Duration: January 1991–December 1991
Commissioned by: Directorate of Water Supply and Sewage
Contractors:
K. Risva, D. Nikolopoulos, A. Efstratiadis, and I. Nalbantis, A framework for dry period low flow forecasting in Mediterranean streams, Water Resources Management, 32 (15), 4911–1432, doi:10.1007/s11269-018-2060-z, 2018.
The objective of this article is to provide a simple and effective tool for low flow forecasting up to six months ahead, with minimal data requirements, i.e. flow observations retrieved at the end of wet period (first half of April, for the Mediterranean region). The core of the methodological framework is the exponential decay function, while the typical split-sample approach for model calibration, which is known to suffer from the dependence on the selection of the calibration data set, is enhanced by introducing the so-called Randomly Selected Multiple Subsets (RSMS) calibration procedure. Moreover, we introduce and employ a modified efficiency metric, since in this modelling context the classical Nash-Sutcliffe efficiency yields unrealistically high performance. The proposed framework is evaluated at 25 Mediterranean rivers of different scales and flow dynamics, including streams with intermittent regime. Initially, signal processing and data smoothing techniques are applied to the raw hydrograph, in order to cut-off high flows that are due to flood events occurring in dry periods, and allow for keeping the decaying form of the baseflow component. We then employ the linear reservoir model to extract the annually varying recession coefficient, and, then, attempt to explain its median value (over a number of years) on the basis of typical hydrological indices and the catchment area. Next, we run the model in forecasting mode, by considering that the recession coefficient of each dry period ahead is a linear function of the observed flow at the end of the wet period. In most of the examined catchments, the model exhibits very satisfactory predictive capacity and is also robust, as indicated by the limited variability of the optimized model parameters across randomly selected calibration sets.
Full text: http://www.itia.ntua.gr/en/getfile/1861/2/documents/Risva2018_Article_AFrameworkForDryPeriodLowFlowF.pdf (2268 KB)
Other works that reference this work (this list might be obsolete):
| 1. | Tsihrintzis, V. A., and H. Vangelis, Water resources and environment, Water Resources Management, 32(15), 4813-4817, doi:10.1007/s11269-018-2164-5, 2018. |
| 2. | Kapetas, L., N. Kazakis, K. Voudouris, and D. McNicholl, Water allocation and governance in multi-stakeholder environments: Insight from Axios Delta, Greece, Science of The Total Environment, 695, 133831, doi:10.1016/j.scitotenv.2019.133831, 2019. |
| 3. | Azarnivand, A., M. Camporese, S. Alaghmand, and E. Dal, Simulated response of an intermittent stream to rainfall frequency patterns, Hydrological Processes, 34(3), 615-632, doi:10.1002/hyp.13610, 2020. |
| 4. | Lee, D., H. Kim, I. Jung, and J. Yoon, Monthly reservoir inflow forecasting for dry period using teleconnection indices: A statistical ensemble approach, Applied Sciences, 10(10), 3470, doi:10.3390/app10103470, 2020. |
| 5. | Nicolle, P., F. Besson, O. Delaigue, P. Etchevers, D. François, M. Le Lay, C. Perrin, F. Rousset, D. Thiéry, F. Tilmant, C. Magand, T. Leurent, and É. Jacob, PREMHYCE: An operational tool for low-flow forecasting, Proceedings of the International Association of Hydrological Sciences, 383, 381-389, doi:10.5194/piahs-383-381-2020, 2020. |
| 6. | Tilmant, F., P. Nicolle, F. Bourgin, F. Besson, O. Delaigue, P. Etchevers, D. François, M. Le Lay, C. Perrin, F. Rousset, D. Thiéry, C. Magand, T. Leurent, et É. Jacob, PREMHYCE : un outil opérationnel pour la prévision des étiages, La Houille Blanche, 5, 37-44, doi:10.1051/lhb/2020043, 2020. |
| 7. | Singh, S. K., and G. A. Griffiths, Prediction of streamflow recession curves in gauged and ungauged basins, Water Resources Research, 57(11), e2021WR030618, doi:10.1029/2021WR030618, 2021. |
| 8. | Orta, S., and H. Aksoy, Development of low flow duration-frequency curves by hybrid frequency analysis, Water Resources Management, 36, 1521-1534, doi:10.1007/s11269-022-03095-3, 2022. |
| 9. | Kadu, A., and B. Biswal, A model combination approach for improving streamflow prediction, Water Resources Management, 36, 5945-5959, doi:10.1007/s11269-022-03336-5, 2022. |
| 10. | Wang, F., R. Men, S. Yan, Z. Wang, H. Lai, K. Feng, S. Gao, Y. Li, W. Guo, and Q. Tian, Identification of the runoff evolutions and driving forces during the dry season in the Xijiang river basin, Water, 16(16), 2317, doi:10.3390/w16162317, 2024. |
| 11. | Bertels, D., L. Breugelmans, and P. Willems, Real-time integrated water availability – Salt intrusion modelling and management during droughts, Journal of Hydrology, 642, 131894, doi:10.1016/j.jhydrol.2024.131894, 2024. |
K. Risva, D. Nikolopoulos, A. Efstratiadis, and I. Nalbantis, A simple model for low flow forecasting in Mediterranean streams, European Water, 57, 337–343, 2017.
Low flows commonly occur in rivers during dry seasons within each year. They often concur with increased water demand which creates numerous water resources management problems. This paper seeks for simple yet efficient tools for low-flow forecasting, which are easy to implement, based on the adoption of an exponential decay model for the flow recession curve. A statistical attribute of flows preceding the start of the dry period is used as the starting flow. On the other hand, the decay rate (recession parameter) is assumed as a linear function of the starting flow. The two parameters of that function are time-invariant, and they are optimized over a reference time series representing the low flow component of the observed hydrographs. The methodology is tested in the basins of Achelous, Greece, Xeros and Peristerona, Cyprus, and Salso, Italy. Raw data are filtered by signal processing techniques which remove the effect of flood events occurring in dry periods, thus allow-ing the preservation of the decaying form of the flow recession curve. Results indicate that satisfac-tory low flow forecasts are possible for Mediterranean basins of different hydrological behaviour.
Remarks:
Conference paper published in Special Issue of European Water: "10th Word Congress on Water Resources and Environment".
Full text: http://www.itia.ntua.gr/en/getfile/1753/1/documents/EW_2017_57_47.pdf (859 KB)
A. Efstratiadis, I. Nalbantis, and D. Koutsoyiannis, Hydrological modelling of temporally-varying catchments: Facets of change and the value of information, Hydrological Sciences Journal, 60 (7-8), 1438–1461, doi:10.1080/02626667.2014.982123, 2015.
River basins are by definition temporally varying systems: changes are apparent at every temporal scale, in terms of changing meteorological inputs and catchment characteristics, respectively due to inherently uncertain natural processes and anthropogenic interventions. In an operational context, the ultimate goal of hydrological modelling is predicting responses of the basin under conditions that are similar or different from those observed in the past. Since water management studies require that anthropogenic effects are considered known and a long hypothetical period is simulated, the combined use of stochastic models, for generating the inputs, and deterministic models that also represent the human interventions in modified basins, is found to be a powerful approach for providing realistic and statistically consistent simulations (in terms of product moments and correlations, at multiple time scales, and long-term persistence). The proposed framework is investigated on the Ferson Creek basin (USA) that exhibits significantly growing urbanization during the last 30 years. Alternative deterministic modelling options include a lumped water balance model with one time-varying parameter and a semi-distributed scheme based on the concept of hydrological response units. Model inputs and errors are respectively represented through linear and non-linear stochastic models. The resulting nonlinear stochastic framework maximizes the exploitation of the existing information, by taking advantage of the calibration protocol used in this issue.
Additional material:
See also: http://dx.doi.org/10.1080/02626667.2014.982123
Works that cite this document: View on Google Scholar or ResearchGate
Other works that reference this work (this list might be obsolete):
| 1. | Thirel, G., V. Andréassian, and C. Perrin, On the need to test hydrological models under changing conditions, Hydrological Sciences Journal, 60(7-8), 1165-1173, doi:10.1080/02626667.2015.1050027, 2015. |
| 2. | Biao, I. E., S. Gaba, A. E. Alamou, and A. Afouda, Influence of the uncertainties related to the random component of rainfall inflow in the Ouémé River Basin (Benin, West Africa), International Journal of Current Engineering and Technology, 5(3), 1618-1629, 2015. |
| 3. | #Christelis, V., and A. Mantoglou, Pumping optimization of coastal aquifers using radial basis function metamodels, Proceedings of 9th World Congress EWRA “Water Resources Management in a Changing World: Challenges and Opportunities”, Istanbul, 2015. |
| 4. | Christelis, V., and A. Mantoglou, Coastal aquifer management based on the joint use of density-dependent and sharp interface models, Water Resources Management, 30(2), 861-876, doi:10.1007/s11269-015-1195-4, 2016. |
| 5. | McMillan, H., A. Montanari, C. Cudennec, H. Savenjie, H. Kreibich, T. Krüger, J. Liu, A. Meija, A. van Loon, H. Aksoy, G. Di Baldassarre, Y. Huang, D. Mazvimavi, M. Rogger, S. Bellie, T. Bibikova, A. Castellarin, Y. Chen, D. Finger, A. Gelfan, D. Hannah, A. Hoekstra, H. Li, S. Maskey, T. Mathevet, A. Mijic, A. Pedrozo Acuña, M. J. Polo, V. Rosales, P. Smith, A. Viglione, V. Srinivasan, E. Toth, R. van Nooyen, and J. Xia, Panta Rhei 2013-2015: Global perspectives on hydrology, society and change, Hydrological Sciences Journal, 61(7), 1174-1191, doi:10.1080/02626667.2016.1159308, 2016. |
| 6. | Biao, I. E., A. E. Alamou, and A. Afouda, Improving rainfall–runoff modelling through the control of uncertainties under increasing climate variability in the Ouémé River basin (Benin, West Africa), Hydrological Sciences Journal, 61(16), 2902-2915, doi:10.1080/02626667.2016.1164315, 2016. |
| 7. | Pathiraja, S., L. Marshall, A. Sharma, and H. Moradkhani, Detecting non-stationary hydrologic model parameters in a paired catchment system using data assimilation, Advances in Water Resources, 94, 103–119, doi:10.1016/j.advwatres.2016.04.021, 2016. |
| 8. | Christelis, V., and A. Mantoglou, Pumping optimization of coastal aquifers assisted by adaptive metamodelling methods and radial basis functions, Water Resources Management, 30(15), 5845–5859, doi:10.1007/s11269-016-1337-3, 2016. |
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| 13. | Sophocleous C., and I. Nalbantis, Effect of land use change on flood extent in the inflow stream of lake Paralimni, Cyprus, European Water, 60, 147-153, 2017. |
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| 15. | Pathiraja, S., D. Anghileri, P. Burlando, A. Sharma, L. Marshall, and H. Moradkhani, Insights on the impact of systematic model errors on data assimilation performance in changing catchments, Advances in Water Resources, 113, 202-222, doi:10.1016/j.advwatres.2017.12.006, 2018. |
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| 17. | Pathiraja, S., D. Anghileri, P. Burlando, A. Sharma, L. Marshall, and H. Moradkhani, Time varying parameter models for catchments with land use change: the importance of model structure, Hydrology and Earth System Sciences, 22, 2903-2919, doi:10.5194/hess-2017-382, 2018. |
| 18. | Varouchakis, E. A., K. Yetilmezsoy, and G. P. Karatzas, A decision-making framework for sustainable management of groundwater resources under uncertainty: combination of Bayesian risk approach and statistical tools, Water Policy, 21(3), 602-622, doi:10.2166/wp.2019.128, 2019. |
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I. Nalbantis, A. Efstratiadis, E. Rozos, M. Kopsiafti, and D. Koutsoyiannis, Holistic versus monomeric strategies for hydrological modelling of human-modified hydrosystems, Hydrology and Earth System Sciences, 15, 743–758, doi:10.5194/hess-15-743-2011, 2011.
The modelling of human-modified basins that are inadequately measured constitutes a challenge for hydrological science. Often, models for such systems are detailed and hydraulics-based for only one part of the system while for other parts oversimplified models or rough assumptions are used. This is typically a bottom-up approach, which seeks to exploit knowledge of hydrological processes at the micro-scale at some components of the system. Also, it is a monomeric approach in two ways: first, essential interactions among system components may be poorly represented or even omitted; second, differences in the level of detail of process representation can lead to uncontrolled errors. Additionally, the calibration procedure merely accounts for the reproduction of the observed responses using typical fitting criteria. The paper aims to raise some critical issues, regarding the entire modelling approach for such hydrosystems. For this, two alternative modelling strategies are examined that reflect two modelling approaches or philosophies: a dominant bottom-up approach, which is also monomeric and, very often, based on output information, and a top-down and holistic approach based on generalized information. Critical options are examined, which codify the differences between the two strategies: the representation of surface, groundwater and water management processes, the schematization and parameterization concepts and the parameter estimation methodology. The first strategy is based on stand-alone models for surface and groundwater processes and for water management, which are employed sequentially. For each model, a different (detailed or coarse) parameterization is used, which is dictated by the hydrosystem schematization. The second strategy involves model integration for all processes, parsimonious parameterization and hybrid manual-automatic parameter optimization based on multiple objectives. A test case is examined in a hydrosystem in Greece with high complexities, such as extended surface-groundwater interactions, ill-defined boundaries, sinks to the sea and anthropogenic intervention with unmeasured abstractions both from surface water and aquifers. Criteria for comparison are the physical consistency of parameters, the reproduction of runoff hydrographs at multiple sites within the studied basin, the likelihood of uncontrolled model outputs, the required amount of computational effort and the performance within a stochastic simulation setting. Our work allows for investigating the deterioration of model performance in cases where no balanced attention is paid to all components of human-modified hydrosystems and the related information. Also, sources of errors are identified and their combined effect are evaluated.
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A. Efstratiadis, I. Nalbantis, A. Koukouvinos, E. Rozos, and D. Koutsoyiannis, HYDROGEIOS: A semi-distributed GIS-based hydrological model for modified river basins, Hydrology and Earth System Sciences, 12, 989–1006, doi:10.5194/hess-12-989-2008, 2008.
The HYDROGEIOS modelling framework represents the main processes of the hydrological cycle in heavily modified catchments, with decision-depended abstractions and interactions between surface and groundwater flows. A semi-distributed approach and a monthly simulation time step are adopted, which are sufficient for water resources management studies. The modelling philosophy aims to ensure consistency with the physical characteristics of the system, while keeping the number of parameters as low as possible. Therefore, multiple levels of schematisation and parameterisation are adopted, by combining multiple levels of geographical data. To optimally allocate human abstractions from the hydrosystem during a planning horizon or even to mimic the allocation occurred in a past period (e.g. the calibration period), in the absence of measured data, a linear programming problem is formulated and solved within each time step. With this technique the fluxes across the hydrosystem are estimated, and the satisfaction of physical and operational constraints is ensured. The model framework includes a parameter estimation module that involves various goodness-of-fit measures and state-of-the-art evolutionary algorithms for global and multiobjective optimisation. By means of a challenging case study, the paper discusses appropriate modelling strategies which take advantage of the above framework, with the purpose to ensure a robust calibration and reproduce natural and human induced processes in the catchment as faithfully as possible.
Remarks:
Permission is granted to reproduce and modify this paper under the terms of the Creative Commons NonCommercial ShareAlike 2.5 license. The discussion paper and its reviews are shown in the HESSD site.
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Works that cite this document: View on Google Scholar or ResearchGate
Other works that reference this work (this list might be obsolete):
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A hydrological simulation model was developed for conjunctive representation of surface and groundwater processes. It comprises a conceptual soil moisture accounting module, based on an enhanced version of the Thornthwaite model for the soil moisture reservoir, a Darcian multi-cell groundwater flow module and a module for partitioning water abstractions among water resources. The resulting integrated scheme is highly flexible in the choice of time (i.e. monthly to daily) and space scales (catchment scale, aquifer scale). Model calibration involved successive phases of manual and automatic sessions. For the latter, an innovative optimization method called evolutionary annealing-simplex algorithm is devised. The objective function involves weighted goodness-of-fit criteria for multiple variables with different observation periods, as well as penalty terms for restricting unrealistic water storage trends and deviations from observed intermittency of spring flows. Checks of the unmeasured catchment responses through manually changing parameter bounds guided choosing final parameter sets. The model is applied to the particularly complex Boeoticos Kephisos basin, Greece, where it accurately reproduced the main basin response, i.e. the runoff at its outlet, and also other important components. Emphasis is put on the principle of parsimony which resulted in a computationally effective modelling. This is crucial since the model is to be integrated within a stochastic simulation framework.
Full text: http://www.itia.ntua.gr/en/getfile/630/1/documents/2004HSJCalibrSemiDistrModel.pdf (445 KB)
Additional material:
See also: http://dx.doi.org/10.1623/hysj.49.5.819.55130
Works that cite this document: View on Google Scholar or ResearchGate
Other works that reference this work (this list might be obsolete):
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I. Nalbantis, and D. Koutsoyiannis, A parametric rule for planning and management of multiple reservoir systems, Water Resources Research, 33 (9), 2165–2177, doi:10.1029/97WR01034, 1997.
A parametric rule for multireservoir system operation is formulated and tested. It is a generalization of the well-known space rule to simultaneously account for various system operating goals in addition to the standard goal of avoiding unnecessary spills, including: avoidance of leakage losses, avoidance of conveyance problems, taking into account the impacts of the reservoir system topology, and assuring satisfaction of secondary uses. Theoretical values of the rule's parameters for each one of these isolated goals are derived. In practice, parameters are evaluated to optimize one or more objective functions selected by the user. The rule is embedded in a simulation model so that optimization requires repeated simulations of the system operation with specific values of the parameters each time. The rule is tested on the case of the multireservoir water supply system of the city of Athens, Greece, which is driven by all of the operating goals listed above. Two problems at the system design level are tackled. First, the total release from the system is maximized for a selected level of failure probability. Second, the annual operating cost is minimized for given levels of water demand and failure probability. A detailed simulation model is used in the case study. Sensitivity analysis to the rule's parameters revealed a subset of insensitive parameters that allowed for rule simplification. Finally, the rule is validated through comparison with a number of heuristic rules also applied to the test case.
Full text: http://www.itia.ntua.gr/en/getfile/41/1/documents/1997WR01034.pdf (452 KB)
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See also: http://dx.doi.org/10.1029/97WR01034
Works that cite this document: View on Google Scholar or ResearchGate
Other works that reference this work (this list might be obsolete):
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| 60. | Salazar, J. Z., P. M. Reed, J. D. Herman, M. Giuliani, and A. Castelletti, A diagnostic assessment of evolutionary algorithms for multi-objective surface water reservoir control, Advances in Water Resources, 92, 172-185, doi:10.1016/j.advwatres.2016.04.006, 2016. |
| 61. | Lei, X., Q. Tan, X. Wang, H. Wang, X. Wen, C. Wang, and Z.-W. Zhang, Stochastic optimal operation of reservoirs based on copula functions, Journal of Hydrology, doi:10.1016/j.jhydrol.2017.12.038, 2017. |
| 62. | Stamou, A. T., and P. Rutschmann, Pareto optimization of water resources using the nexus approach, Water Resources Management, doi:10.1007/s11269-018-2127-x, 2018. |
| 63. | Bayesteh, M., and A. Azari, Stochastic optimization of reservoir operation by applying hedging rules, Journal of Water Resources Planning and Management, 147(2), doi:10.1061/(ASCE)WR.1943-5452.0001312, 2021. |
I. Nalbantis, D. Koutsoyiannis, and Th. Xanthopoulos, Modelling the Athens water supply system, Water Resources Management, 6, 57–67, doi:10.1007/BF00872188, 1992.
This paper presents an investigation of a real-world water-resources problem involving both planning and management aspects. The Athens water supply system is studied in order to assist its future operation and the design of alternative system improving works. The yield of the existing system is first assessed via simulation. Then the risk of system failure to meet the water demand is evaluated for various water demand scenarios and operation policies, with emphasis on the 1989-90 critical situation. Alternative future reservoirs in the Evinos River Basin are studied by testing large number of technical solutions. Uncertainties on hydrology, leakage losses, water demand, and possible damages are taken into account. Finally, a computer programme is developed to assist the water supply policy design for the existing Mornos-Iliki system.
See also: http://dx.doi.org/10.1007/BF00872188
Works that cite this document: View on Google Scholar or ResearchGate
Other works that reference this work (this list might be obsolete):
| 1. | Giakoumakis, S.G., and G. Baloutsos, Investigation of trend in hydrological time series of the Evinos river basin, Hydrological Sciences Journal, 42(1), 81-88, 1997. |
| 2. | McMahon, T. A., A. S. Kiem, M. C. Peel, P. W. Jordan, and G. G. S. Pegram, A New Approach to Stochastically Generating Six-Monthly Rainfall Sequences Based on Empirical Mode Decomposition, Journal of Hydrometeorology, 9(6), 1377-1389, 2008. |
K. Risva, D. Nikolopoulos, A. Efstratiadis, and I. Nalbantis, A simple model for low flow forecasting in Mediterranean streams, 10th World Congress on Water Resources and Environment "Panta Rhei", Athens, European Water Resources Association, 2017.
Low flows commonly occur in rivers during dry seasons within each year. They often concur with increased water demand which creates numerous water resources management problems. This paper seeks for simple yet efficient tools for low-flow forecasting, which are easy to implement, based on the adoption of an exponential decay model for the flow recession curve. A statistical attribute of flows preceding the start of the dry period is used as the starting flow, as for example the minimum flow of early April. On the other hand, the decay rate (recession parameter) is assumed as a linear function of the starting flow. The two parameters of that function are time-invariant, and they are optimised over a reference time series representing the low flow component of the observed hydrographs. The methodology is tested in the basins of Achelous, Greece, Xeros and Peristerona, Cyprus, and Salso, Italy. Raw data are filtered by simple signal processing techniques which remove the effect of flood events occurring in dry periods, thus allowing the preservation of the decaying form of the flow recession curve. Results indicate that satisfactory low flow forecasts are possible for Mediterranean basins of different hydrological behaviour.
Additional material:
I. Nalbantis, E. Rozos, G. M. T. Tentes, A. Efstratiadis, and D. Koutsoyiannis, Integrating groundwater models within a decision support system, Proceedings of the 5th International Conference of European Water Resources Association: "Water Resources Management in the Era of Transition", edited by G. Tsakiris, Athens, 279–286, European Water Resources Association, 2002.
An attempt is made to integrate groundwater models within a decision support system (DSS) called Hydronomeas, which is designed to assist large multi-reservoir system (MRS) management. This will help managing conjunctive use schemes. The DSS is currently used for the water supply of Athens, Greece. The simulated system is the Boeoticos Kephisos River Basin and its underlying karst. The karst supplies irrigation water locally as well as drinking water to Athens. Furthermore, the basin's surface outflows account for most of the inflow into Lake Yliki, one of the three main reservoirs of the Athens MRS. Three models of different levels of complexity are tested. The first model is a multi-cell model that simulates surface flows within the basin coupled to subsurface flows. The second model is a conceptually-based lumped model while the third model is a pre-existing distributed groundwater model based on the MODFLOW package. Tests with various management scenarios allow drawing conclusions regarding model efficiency and suitability for use within a DSS.
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Other works that reference this work (this list might be obsolete):
| 1. | #Dentinho, T.P., R. Minciardi, M. Robba, R. Sacile & V. Silva, Impacts of agriculture and dairy farming on groundwater quality: an optimization problem. In: Voinov, A. et al. (eds.), Proceedings of the iEMSs 3rd Biennial Meeting, Burlington, USA, 2006. |
| 2. | #Giupponi, C., Sustainable Management of Water Resources: An Integrated Approach, 361 pages, Edward Elgar Publishing (ISBN 1845427459), 2006. |
| 3. | #Barlebo, H.C. (ed.), State-of-the-art report with users’ requirements for new IWRM tools, NeWater, www.newater.info, 2006. |
| 4. | #Dentinho, T. et al, The architecture of a decision support system (DSS) for groundwater quality preservation in Terceira Island (Azores), Integrated Water Management: Practical Experiences and Case Studies, P. Meire et al. (eds.), Springer, 2007. |
| 5. | #Lowry, T. S., S. A. Pierce, V. C. Tidwell, and W. O. Cain, Merging spatially variant physical process models under an optimized systems dynamics framework, Technical Report, Sandia National Laboratories, 67 p., 2007. |
| 6. | Bandani, E. and M. A. Moghadam, Application of groundwater mathematical model for assessing the effects of Galoogah dam on the Shooro aquifer, Iran, European Journal of Scientific Research, 54 (4), 499-511, 2011. |
| 7. | Golchin, I., M. A. Moghaddam and N. Asadi, Numerical study of groundwater flow in Iranshahr plain aquifer, Iran, Middle-East Journal of Scientific Research, 8 (5), 975-983, 2011. |
| 8. | #Minciardi, R., M. Robba, and R. Sacile, Environmental Decision Support Systems for soil pollution control and prevention, Soil Remediation, L. Aachen and P. Eichmann (eds.), Chapter 2, 45-85, Nova Science Publishers, 2011. |
| 9. | #Pierce, S. a., J. M. Sharp Jr, and D. J. Eaton, Decision support systems and processes for groundwater, Integrated Groundwater Management: Concepts, Approaches and Challenges, A. J. Jakeman, O. Barreteau, R. J. Hunt, J.-D. Rinaudo, A. Ross (editors), 639-665, Springer, doi:10.1007/978-3-319-23576-9_25, 2016. |
N. Papakostas, I. Nalbantis, and D. Koutsoyiannis, Modern computer technologies in hydrologic data management, Proceedings of the 2nd European Conference on Advances in Water Resources Technology and Management, edited by G. Tsakiris and M. A. Santos, Lisbon, 285–293, doi:10.13140/RG.2.1.4167.9604, Balkema, Rotterdam, 1994.
Advanced water resources management is facilitated by hydrologic data management using modem computer technologies. By means of such technologies, a distributed data management system for hydrologic, meteorologic and hydrogeologic historical information has been built. In this paper, we present the fundamental design and implementation principles and features of the system. Information classification, local and distributed database design and network architecture are described.
Full text: http://www.itia.ntua.gr/en/getfile/32/3/documents/1994EWRAModernCompTechn-ocr.pdf (1225 KB)
Additional material:
I. Nalbantis, N. Mamassis, et D. Koutsoyiannis, Le phénomène recent de sécheresse persistante et l' alimentation en eau de la cité d' Athènes, Publications de l'Association Internationale de Climatologie, 6eme Colloque International de Climatologie, edité par P. Maheras, Thessaloniki, 6, 123–132, doi:10.13140/RG.2.1.4430.1041, Association Internationale de Climatologie, Aix-en-Provence Cedex, France, 1993.
We analyse statistically the historic hydrologic samples of the water basins of Mornos and B. Kifissos-Yliki. A decreasing trend on the precipitation and runoff for the B. Kifissos basin was found. Moreover, a significant reduction of the annual inflows was found for the period of the recent six-year drought for both basins. The analysis of precipitation did not reveal any significant reduction on their annual values, but it is rather their within-year distribution that has been substantially modified. More specifically, the precipitation of January during the last six years is significantly less than that of the previous period, a fact that explains the significant reduction of the inflows to the reservoirs of Mornos and Yliki.
Full text: http://www.itia.ntua.gr/en/getfile/38/2/documents/1993AICSecheresse-ocr.pdf (1102 KB)
Additional material:
See also: http://dx.doi.org/10.13140/RG.2.1.4430.1041
Works that cite this document: View on Google Scholar or ResearchGate
Other works that reference this work (this list might be obsolete):
| 1. | Giakoumakis, S.G., and G. Baloutsos, Investigation of trend in hydrological time series of the Evinos river basin, Hydrological Sciences Journal, 42(1), 81-88, 1997. |
| 2. | Leroux, M., Global Warming: Myth or reality? The actual evolution of the weather, Annales de Geographie, (624), 115-137, 2002. |
| 3. | Leroux, M., Global Warming: Myth or reality? The actual evolution of the weather, Energy and Environment, 14(2-3), 297-322, 2003. |
| 4. | #Leroux, M., Global Warming: Myth Or Reality?: The Erring Ways of Climatology, Springer, 510 pp., 2005. |
| 5. | Sardou, S. F., and A. Bahremand, Hydrological drought analysis using SDI Index in Halilrud basin of Iran, The International Journal of Environmental Resources Research, 1(3), 279-288, 2013. |
K. Risva, D. Nikolopoulos, A. Efstratiadis, and I. Nalbantis, Low-flow analysis in Mediterranean basins, European Geosciences Union General Assembly 2018, Geophysical Research Abstracts, Vol. 20, Vienna, EGU2018-18880, European Geosciences Union, 2018.
In this work we examine the low flow characteristics of Mediterranean basins during the dry season. For convenience, we consider a six-month period, from mid-April to mid-October, which is generally characterized by limited precipitation and increased water demands. Our emphasis is given to the baseflow component, represented through a linear reservoir approach, key component of which is the recession rate. Classic indices, such as flow quantiles, are calculated along a simple exponential recession model. Our analysis aims to explain the significant variability of the recession rate across hydrological years and across river basins with different characteristics, in terms of extent, elevation, physiographical properties and runoff production. Results show that the recession rate is strongly correlated to characteristic hydrological signatures, and it is also a function of the basin area. The study applies to 25 Mediterranean basins across France, Spain, Cyprus, Italy and Greece, including some small catchments with intermittent flow regime.
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A. Efstratiadis, I. Nalbantis, and D. Koutsoyiannis, Effective combination of stochastic and deterministic hydrological models in a changing environment, European Geosciences Union General Assembly 2018, Geophysical Research Abstracts, Vol. 20, Vienna, EGU2018-11989, European Geosciences Union, 2018.
Water resource systems are subject to continuous changes, at all temporal scales. Changes are induced due to the inherently varying meteorological processes, anthropogenic interventions of all kinds, as well as other exogenous factors modifying the system characteristics. Traditionally, stochastic models, for generating synthetic input data, and deterministic hydrological models, for representing anticipated or hypothesized environmental changes, have been regarded as alternative approaches to provide future projections of the system responses. Given that both approaches are driven by historical data, they are restricted by the limited, and sometimes misinterpreted, information of past observations. Using examples from real-world hydrosystems, we propose a nonlinear stochastic framework, by coupling stochastic and deterministic models, which aims to take full advantage of the existing data and understanding. A central assumption is that all key uncertain aspects of the overall simulation procedure are expressed in stochastic terms (including model parameters and water demands, among others), while major uncertainties with respect to changing processes that cannot be captured by past data are consistently represented through the Hurst-Kolmogorov paradigm.
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A. Efstratiadis, I. Nalbantis, and D. Koutsoyiannis, Hydrological modelling in presence of non-stationarity induced by urbanisation: an assessment of the value of information, “Knowledge for the future”, IAHS - IAPSO – IASPEI Joint Assembly 2013, Gothenburg, doi:10.13140/RG.2.2.13178.49607, International Association of Hydrological Sciences, 2013.
The proposed protocol of the workshop is followed, which regards the investigation of the effect of non-stationarity due to urbanisation on the performance of a hydrological model. In particular, the rainfall-runoff component of HYDROGEIOS modelling framework (Efstratiadis et al., 2008) is used. This is a parsimonious model of the conceptual type, based on the idea of Hydrological Response Unit (HRU). It is parameterised per HRU with seven parameters in each. Both a lumped and a semi-distributed version are employed. In the latter, two HRUs are assumed, representing the urban and rural areas of the basin. The Evolutionary Annealing Simplex method is used to obtain the best parameter set along with a large number of other retained parameter sets. Levels 1 and 2 of the proposed protocol provide the necessary information for analysis of Level 3, where a stochastic framework is considered inspired by the ideas proposed by Montanari & Koutsoyiannis (2012). This takes into account external information on urbanised fraction of the studied basin. A relationship is established between data on fraction of urbanised area and one of more parameters of the lumped model, while the semi-distributed one takes into account the fraction of urbanised area explicitly. Comparison of prediction intervals with and without exploiting such relationship allows the assessment of the value of information regarding the factor that induces nonstationarity. The methodology as a whole is applied to one of the two drainage basins that show growing urbanisation (Ferson Creek at St. Charles, USA).
Full text: http://www.itia.ntua.gr/en/getfile/1377/1/documents/2013_IAHS_poster.pdf (602 KB)
A. Efstratiadis, I. Nalbantis, E. Rozos, and D. Koutsoyiannis, Accounting for water management issues within hydrological simulation: Alternative modelling options and a network optimization approach, European Geosciences Union General Assembly 2010, Geophysical Research Abstracts, Vol. 12, Vienna, 10085, doi:10.13140/RG.2.2.22189.69603, European Geosciences Union, 2010.
In mixed natural and artificialized river basins, many complexities arise due to anthropogenic interventions in the hydrological cycle, including abstractions from surface water bodies, groundwater pumping or recharge and water returns through drainage systems. Typical engineering approaches adopt a multi-stage modelling procedure, with the aim to handle the complexity of process interactions and the lack of measured abstractions. In such context, the entire hydrosystem is separated into natural and artificial sub-systems or components; the natural ones are modelled individually, and their predictions (i.e. hydrological fluxes) are transferred to the artificial components as inputs to a water management scheme. To account for the interactions between the various components, an iterative procedure is essential, whereby the outputs of the artificial sub-systems (i.e. abstractions) become inputs to the natural ones. However, this strategy suffers from multiple shortcomings, since it presupposes that pure natural sub-systems can be located and that sufficient information is available for each sub-system modelled, including suitable, i.e. “unmodified”, data for calibrating the hydrological component. In addition, implementing such strategy is ineffective when the entire scheme runs in stochastic simulation mode. To cope with the above drawbacks, we developed a generalized modelling framework, following a network optimization approach. This originates from the graph theory, which has been successfully implemented within some advanced computer packages for water resource systems analysis. The user formulates a unified system which is comprised of the hydrographical network and the typical components of a water management network (aqueducts, pumps, junctions, demand nodes etc.). Input data for the later include hydraulic properties, constraints, targets, priorities and operation costs. The real-world system is described through a conceptual graph, whose dummy properties are the conveyance capacity and the unit cost of each link. Unit costs are either real or artificial, and positive or negative. Positive costs are set to prohibit undesirable fluxes and negative ones to force fulfilling water demands for various uses. The assignment of costs is based on a recursive algorithm that implements the physical constraints and the user-specified hierarchy for the water uses. Referring to the desired management policy, an optimal allocation is achieved regarding the unknown fluxes within the hydrosystem (flows, abstractions, water losses) by minimizing the total transportation cost through the graph. The mathematical structure of the problem enables use of accurate and exceptionally fast solvers. The proposed methodology is effective, efficient and easy to implement, in order to link on-line multiple modelling components, thus ensuring a comprehensive overview of the process interactions in complex and heavily modified hydrosystems. It is applicable to hydrological simulators of the semi-distributed type, in which it allows integrating groundwater models and flood routing schemes within decision support modules. The methodology is implemented within the HYGROGEIOS computer package, which is illustrated by example applications in modified river basins in Greece.
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I. Nalbantis, A. Efstratiadis, and D. Koutsoyiannis, On the use and misuse of semi-distributed rainfall-runoff models, XXIV General Assembly of the International Union of Geodesy and Geophysics, Perugia, doi:10.13140/RG.2.2.14351.59044, International Union of Geodesy and Geophysics, International Association of Hydrological Sciences, 2007.
Recent advances in hydrological modelling have led to a variety of complex, distributed or semi-distributed schemes, aiming to describe the heterogeneity of physical processes across a river basin. These are useful for operational purposes, such as design of large hydraulic structures, sustainable management of water resources and flood forecasting. However, due to the large number of parameters involved and the need for extended measurements, a robust calibration, which ensures a satisfactory predictive capacity as well as a physical interpretation of parameters, is a very difficult task. Hence, the applicability of such models in real-world studies, employed by practitioners with moderate hydrological knowledge, is at least questionable. The paper aims to reveal some critical issues, regarding the entire procedure of selecting, configuring and fitting a hydrological model. These are discussed on the basis of four classification criteria: the expertise level of the user, the representation of processes, the parameterization concept and the calibration strategy. An inexperienced user focuses on just finding a good fitting between model outputs and observations, usually by activating more parameters than are supported by the data. In contrast, an expert hydrologist wishes to explain the entire spectrum of model results, giving emphasis on the reasonable representation of the processes and the consistency of the all output variables, even those not controlled by the calibration (e.g. real evapotranspiration, soil moisture and groundwater storage fluctuation, etc.). In terms of the processes representation, modelling approaches that are devised for uniform, undisturbed basins are misused if applied on complex systems, with multiple human interventions. The next criterion refers to the parameterization procedure. Some approaches assign parameter values on the basis of the schemati zation, i.e. the spatial discretization of the system under study (e.g. the sub-basins), thus leading to schemes with too many degrees of freedom, suffering from the well-known "curse of dimensionality". On the other hand, more intelligent models assume different levels of parameterization and schematization, employing the concept of a hydrological response unit. Thus, they significantly reduce the number of control parameters, also ensuring consistency with the physical characteristics of the system under study. Finally, one may classify the calibration strategies from manual, one-criterion fitting to sophisticated automatic optimization methods, using evolutionary algorithms and multiple fitting criteria, both statistical (based on measurements) and empirical (based on the hydrological experience). The above spectrum of modelling options is explored by selecting representative cases which reveal problems of everyday hydrological practice. The test area is the Boeoticos Kephisos basin, Greece, where a conjunctive simulation model is employed to describe the surface and groundwater hydrological processes as well as the water management practices.
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A. Efstratiadis, A. Koukouvinos, E. Rozos, I. Nalbantis, and D. Koutsoyiannis, Control of uncertainty in complex hydrological models via appropriate schematization, parameterization and calibration, European Geosciences Union General Assembly 2006, Geophysical Research Abstracts, Vol. 8, Vienna, 02181, doi:10.13140/RG.2.2.28297.65124, European Geosciences Union, 2006.
The recent expansion of complex, distributed modelling schemes results in significant increase of computational effort, thus making the traditional parameter estimation problem extremely difficult to handle. Recent advances provide a variety of mathematical techniques to quantify the uncertainty of model predictions. Despite their different theoretical background, such approaches aim to discover "promising" trajectories of the model outputs that correspond to multiple, "behavioural" parameter sets, rather than a single "global optimal" one. Yet, their application indicates that it is not unusual the case where model predictive uncertainty is comparable to the typical statistical uncertainty of the measured outputs, thus making the model validity at least questionable. Uncertainty is due to multiple sources that are interacted in a chaotic manner. Some of them are "inherent" and therefore unavoidable, as they are related to the complexity of physical processes, necessarily represented through simplified hypotheses about the watershed behaviour. Other sources are though controllable via appropriate schematization, parameterization and calibration. This involves adaptation of the principle of parsimony, appropriate distributed models and incorporation of hydrological experience within the parameter estimation procedure. The above issues are discussed on the basis of a conjunctive modelling scheme, fitted to two complex hydrosystems of Greece. A parsimonious structure is made possible by spatial analysis that is consistent with the available data and the operational requirements regarding water management, and the correspondence of model parameters to the "broad" physical characteristics of each system. Within the calibration strategy, the key concept is to exploit any type of knowledge, including systematic measurements as well as additional information about non-measured model outputs, in a multi-response optimization framework. The entire approach contributes to a significant reduction of uncertainties, as indicated by successful validation results.
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A. Efstratiadis, G. Karavokiros, S. Kozanis, A. Christofides, A. Koukouvinos, E. Rozos, N. Mamassis, I. Nalbantis, K. Noutsopoulos, E. Romas, L. Kaliakatsos, A. Andreadakis, and D. Koutsoyiannis, The ODYSSEUS project: Developing an advanced software system for the analysis and management of water resource systems, European Geosciences Union General Assembly 2006, Geophysical Research Abstracts, Vol. 8, Vienna, 03910, doi:10.13140/RG.2.2.24942.20805, European Geosciences Union, 2006.
The ODYSSEUS project (from the Greek acronym of its full title "Integrated Management of Hydrosystems in Conjunction with an Advanced Information System") aims at providing support to decision-makers towards integrated water resource management. The end-product comprises a system of co-operating software applications, suitable to handle a wide spectrum of water resources problems. The key methodological concepts are the holistic modelling approach, through the conjunctive representation of processes regarding water quantity and quality, man-made interventions, the parsimony of both input data requirements and system parameterization, the assessment of uncertainties and risks, and the extended use of optimization both for modelling (within various scales) and derivation of management policies. The core of the system is a relational database, named HYDRIA, for storing hydrosystem information; this includes geographical data, raw and processed time series, characteristics of measuring stations and facilities, and a variety of economic, environmental and water quality issues. The software architecture comprises various modules. HYDROGNOMON supports data retrieval, processing and visualization, and performs a variety of time series analysis tasks. HYDROGEIOS integrates a conjunctive hydrological model within a systems-oriented water management scheme, which estimates the available water resources at characteristic sites of the river basin and at the underlying aquifer. HYDRONOMEAS is the hydrosystem control module and locates optimal operation policies that minimize the risk and cost of decision-making. Additional modules are employed to prepare input data. DIPSOS estimates water needs for various uses (water supply, irrigation, industry, etc.), whereas RYPOS estimates pollutant loads from point and non-point sources, at a river basin scale. A last category comprises post-processing modules, for evaluating the proposed management policies by means of economical efficiency and water quality requirements. The latter include sophisticated models that estimate the space and time variation of specific pollutants within rivers (HERIDANOS) and lakes (LERNE), as well as simplified versions of them to be used within the hydrosystem simulation scheme. An interactive framework enables the exchange of data between the various modules, either off-line (through the database) or on-line, via appropriate design of common information structures. The whole system is in the final phase of its development and parts of it have been already tested in operational applications, by water authorities, organizations and consulting companies.
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Additional material:
A. Efstratiadis, A. Tegos, I. Nalbantis, E. Rozos, A. Koukouvinos, N. Mamassis, S.M. Papalexiou, and D. Koutsoyiannis, Hydrogeios, an integrated model for simulating complex hydrographic networks - A case study to West Thessaly region, 7th Plinius Conference on Mediterranean Storms, Rethymnon, Crete, doi:10.13140/RG.2.2.25781.06881, European Geosciences Union, 2005.
An integrated scheme, comprising a conjunctive hydrological model and a systems oriented management model, was developed, based on a semi-distributed approach. Geographical input data include the river network, the sub-basins upstream of each river node and the aquifer dicretization in the form of groundwater cells of arbitrary geometry. Additional layers of distributed geographical information, such as geology, land cover and terrain slope, are used to define the hydrological response units. Various modules are combined to represent the main processes at the water basin such as, soil moisture, groundwater, flood routing and water management models. Model outputs include river discharges, spring flows, groundwater levels and water abstractions. The model can be implemented in daily and monthly basis. A case study to the West Thessaly region performed. The discharges of five hydrometric stations and the water levels of eight boreholes were used simultaneously for model calibration. The implementation of the model to the certain region demonstrated satisfactory agreement between the observed and the simulated data.
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A. Efstratiadis, E. Rozos, A. Koukouvinos, I. Nalbantis, G. Karavokiros, and D. Koutsoyiannis, An integrated model for conjunctive simulation of hydrological processes and water resources management in river basins, European Geosciences Union General Assembly 2005, Geophysical Research Abstracts, Vol. 7, Vienna, 03560, doi:10.13140/RG.2.2.27930.64960, European Geosciences Union, 2005.
In complex hydrosystems, where natural processes are significantly affected by human interventions, a holistic modelling concept is required, to ensure a more faithful representation of mechanisms and hence a rational water resource management. An integrated scheme, comprising a conjunctive (i.e., surface and groundwater) hydrological model and a systems-oriented management model, was developed, based on a semi-distributed approach. Geographical input data include the river network, the sub-basins upstream of each river node and the aquifer discretization in the form of groundwater cells of arbitrary geometry. Additional layers of distributed geographical information, such as geology, land cover and terrain slope, are used to define the hydrological response units (HRUs); the latter are spatial components that correspond to areas of homogenous hydrological characteristics. On the other hand, input data for artificial components include reservoirs, water abstraction facilities, aqueducts and demand points. Dynamic input data consist of precipitation and potential evapotranspiration series, given at a sub-basin scale, and target demand series. Targets refer not only to water needs but also to various water management constraints, such as the preservation of minimum flows across the river network. Various modules are combined to represent the key processes in the watershed, i.e. (a) a conceptual soil moisture accounting model, with different parameters assigned to each HRU; (b) a groundwater model, based on a modified finite-volume numerical method; (c) a routing model, that implements the water movement across the river network; and (d) a water management model, inspired from the graph theory, which estimates the optimal hydrosystem fluxes, satisfying both physical constraints and target priorities and simultaneously minimising costs. Model outputs include discharges through the river network, spring flows, groundwater levels and water abstractions. The calibration employs an automatic procedure, based on multiple error criteria and a robust global optimisation algorithm. The model was applied to a meso-scale (~2000 km2) watershed in Greece, characterised by a complex physical system (a karstified background, with extended losses to the sea) and conflicting water uses. 10-year monthly discharge series from seven gauging stations were used to evaluate the model performance. Extended analysis proved that the exploitation of spatially distributed input information, in addition to the usage of a reasonable number of control variables that are fitted to multiple observed responses, ensures more realistic model parameters, also reducing prediction uncertainty, in comparison to earlier (both fully conceptual and fully distributed) approaches. Moreover, the incorporation of the water resource management scheme within the hydrological simulator makes the model suitable for operational use.
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A. Efstratiadis, D. Koutsoyiannis, E. Rozos, and I. Nalbantis, Calibration of a conjunctive surface-groundwater simulation model using multiple responses, EGS-AGU-EUG Joint Assembly, Geophysical Research Abstracts, Vol. 5, Nice, doi:10.13140/RG.2.2.23002.34246, European Geophysical Society, 2003.
A multi-cell semi-distributed model was developed to simulate the hydrological processes of the Boeoticos Kephisos river basin and its underlying karst. The whole system (surface and underground) provides water for local irrigation use as well as for the supply of Athens. Moreover, the basin outflow, a significant part of which comes from karstic springs, feeds Lake Yliki, one of the three main supply reservoirs of Athens. The model consists of a set of interconnected cells. Each cell is further divided into a surface and a ground water sub-cell. The former is modelled as a soil moisture reservoir, with precipitation and potential evapotranspiration as inputs, and surface runoff, actual evapotranspiration and deep percolation as outputs. The groundwater sub-cell operates according to Darcy's law; it accepts percolation and lateral flow as inputs, and yields lateral outflow to adjacent cells or the sea, spring runoff and water abstractions as outputs. A heuristic evolutionary optimisation algorithm, where a generalised downhill simplex scheme is coupled with a simulated annealing strategy, is applied to calibrate the model. The model calibration is based on a multi-objective approach, aiming at fitting the historical hydrographs, which are available at the basin outlet and the main spring sites, to the simulated ones. Extended analysis illustrated that the uncertainty of parameters is much larger for the groundwater subsystem, mainly due to the existence of non-measurable outflows to the sea. Hence, the selection of the best-compromise parameter set is based on empirical estimations of the location and magnitude of losses to the sea.
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N. Mamassis, D. Koutsoyiannis, and I. Nalbantis, Intense rainfall and flood event classification by weather type, 19th General Assembly of the European Geophysical Society, Annales Geophysicae, Vol. 12, Supplement II, Part II, Grenoble, 440, doi:10.13140/RG.2.1.4124.9520, European Geophysical Society, 1994.
The influence of different weather types on intense rainfall and flood discharge is studied. Data from Western Greece are analysed, through a weather type classification that has been widely used in Greece. The probability of occurrence of intense rainfall events and flood events, conditional on the prevailing weather type, are calculated. Also, the statistics of the event characteristics are extracted and analysed through statistical tests and analysis of variance. The analyses show that there exist statistically significant differences in the probability of occurrence of an intense rainfall and flood event. However, the weather type concept does not explain significant portion of the variance of the event characteristics, such as rainfall duration, total depth, intensity, and discharge volume.
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Additional material:
I. Nalbantis, D. Koutsoyiannis, and Th. Xanthopoulos, Modelling the Athens water supply system, 1st European Conference on Advances in Water Resources Technology, Athens, European Water Resources Association, 1991.
An investigation of a real-world water-resources problem involving both planning and management aspects is presented. The Athens water supply system is studied in order to assist its future operation and the design of alternative system improving works. The yield of the existing system is first assessed via simulation. Then the risk of system failure to meet the water demand is evaluated for various water demand scenarios and operation policies, with emphasis on the 1989-90 critical situation. Alternative future reservoirs in the Evinos River Basin are studied by testing large number of technical solutions. Uncertainties on hydrology, leakage losses, water demand, and possible damages are taken into account. Finally, a computer programme is developed to assist the water supply policy design for the existing Mornos-Iliki system.
Related works:
I. Nalbantis, D. Koutsoyiannis, C. Tsolakidis, and Th. Xanthopoulos, Planning and operating of the hydrosystem of Athens, Workshop for the perspectives of resolving the water supply problem of Athens, edited by D. Koutsoyiannis, 101–108, doi:10.13140/RG.2.1.3952.9207, G. Fountas, 1990.
Full text: http://www.itia.ntua.gr/en/getfile/80/1/documents/1992EEDYPSxediasmos.pdf (400 KB)
K. Risva, D. Nikolopoulos, A. Efstratiadis, and I. Nalbantis, A simple model for low flow forecasting in Mediterranean streams, 5th Hellenic Conference of Surveying Enginners, Athens, 2017.
Low flows commonly occur in rivers during dry seasons within each year. They often concur with increased water demand which creates numerous water resources management problems. This paper seeks for simple yet efficient tools for low-flow forecasting, which are easy to implement, based on the adoption of an exponential decay model for the flow recession curve. A statistical attribute of flows preceding the start of the dry period is used as the starting flow. On the other hand, the decay rate (recession parameter) is assumed as a linear function of the starting flow. The two parameters of that function are time-invariant, and they are optimized over a reference time series representing the low flow component of the observed hydrographs. The methodology is tested in the basins of Achelous, Greece, Xeros and Peristerona, Cyprus, and Salso, Italy. Raw data are filtered by signal processing techniques which remove the effect of flood events occurring in dry periods, thus allow-ing the preservation of the decaying form of the flow recession curve. Results indicate that satisfac-tory low flow forecasts are possible for Mediterranean basins of different hydrological behaviour.
Related works:
Full text: http://www.itia.ntua.gr/en/getfile/1752/1/documents/PSDATM_low_flows_article.pdf (1015 KB)
Additional material:
D. Koutsoyiannis, G. Tsakalias, A. Christofides, A. Manetas, A. Sakellariou, R. Mavrodimou, N. Papakostas, N. Mamassis, I. Nalbantis, and Th. Xanthopoulos, HYDROSCOPE: Creation of a national data bank of hydrological and meteorological information, Research and Technology Days '95, National Technical University of Athens, 1995.
Full text: http://www.itia.ntua.gr/en/getfile/94/1/documents/1995EMPhydroscopeXanth.pdf (435 KB)
I. Nalbantis, N. Mamassis, D. Koutsoyiannis, E. Baltas, M. Aftias, M. Mimikou, and Th. Xanthopoulos, Hydrologic characteristics of the water shortage, The water supply problem of Athens, 13–28, Department of Water Resources, Hydraulic and Maritime Engineering – National Technical University of Athens, 1994.
Full text: http://www.itia.ntua.gr/en/getfile/100/1/documents/1994TomeasLeipsydria.pdf (1030 KB)
Other works that reference this work (this list might be obsolete):
| 1. | #Schilling, W. and A. Mantoglou, Sustainable water management in an urban context, Drought management planning in water supply systems, E. Cabrera and J. Garcia-Serra (Ed.), Kluwer, 93-215, 1999. |
I. Nalbantis, and D. Koutsoyiannis, Assessment of the risk for inadequacy of the water supply system of Athens, Water Supply of Athens, Association of Civil Engineers of Greece, Greek Union of Chemical Engineers, Association of the Greek Consulting Companies, 1992.
Full text: http://www.itia.ntua.gr/en/getfile/111/1/documents/1992SPMEAthensWSS.pdf (879 KB)
N. Mamassis, I. Nalbantis, and D. Koutsoyiannis, Investigation of hydrological characteristics of Mornos, Boeoticos Kephisos and Yliki basins, Water Supply of Athens, Association of Civil Engineers of Greece, Greek Union of Chemical Engineers, Association of the Greek Consulting Companies, 1992.
Full text: http://www.itia.ntua.gr/en/getfile/110/1/documents/1992SPMELekanes.pdf (884 KB)
D. Koutsoyiannis, I. Nalbantis, and N. Mamassis, Assessment of the risk for inadequacy of the water supply system of Athens in case of persistent drought, Likelihood of persistent drought and water supply of Athens, doi:10.13140/RG.2.2.13244.03207, Water Supply and Sewerage Company of Athens, 1992.
Full text: http://www.itia.ntua.gr/en/getfile/108/1/documents/1992EYDAPDrought.pdf (1874 KB)
Additional material:
Th. Xanthopoulos, D. Koutsoyiannis, and I. Nalbantis, Pilot study for the management of Louros and Arachthos basins. Appraisal of methodology and results, Computer aided water resources management, doi:10.13140/RG.2.2.35893.27360, Ministry of the Industry, 1991.
Full text: http://www.itia.ntua.gr/en/getfile/112/1/documents/1991YBETLouros.pdf (605 KB)
Th. Xanthopoulos, M. Mimikou, M. Aftias, D. Koutsoyiannis, and I. Nalbantis, Assessment of the water supply problem of Athens under the prevailing drought, Report to the Minister of Environment, Planning & Public Works, 8 pages, Department of Water Resources, Hydraulic and Maritime Engineering – National Technical University of Athens, Athens, 1993.
Full text: http://www.itia.ntua.gr/en/getfile/502/1/documents/1993YpomnLeipsydr.pdf (349 KB)
I. Nalbantis, Notes on Advanced Hydrology - Part C, 58 pages, National Technical University of Athens, Athens, 1999.
Full text: http://www.itia.ntua.gr/en/getfile/542/1/documents/1999AdvHydroSnow.pdf (503 KB)
I. Nalbantis, [No English title available], Diploma thesis, 68 pages, Department of Water Resources, Hydraulic and Maritime Engineering – National Technical University of Athens, Athens, 1983.
A. Efstratiadis, A. Koukouvinos, E. Rozos, A. Tegos, and I. Nalbantis, Theoretical documentation of model for simulating hydrological-hydrogeological processes of river basin "Hydrogeios", Integrated Management of Hydrosystems in Conjunction with an Advanced Information System (ODYSSEUS), Contractor: NAMA, Report 4a, 103 pages, Department of Water Resources, Hydraulic and Maritime Engineering – National Technical University of Athens, Athens, December 2006.
The subject of the report is the development of the software system HYDROGEIOS, which represents the hydrological and hydrogeological processes as well as the water resource management practices of a river basin. After a short review of the most recognized hydrological models and a general overview of the problem, we describe the theoretical background of the approach, comprising the combined operation of three models: (a) a conceptual soil moisture accounting model, with different parameters for each hydrological response unit, which estimates the transformation of precipitation to evapotranspiration, surface runoff and percolation; (b) a multicell groundwater model, which estimates the spatial distribution of the water table, the baseflow (spring runoff) and the underground losses; and (c) a water resources allocation model, which for given hydrological inflows along the river network, given characteristics of technical facilities (aqueducts, wells) and given targets and constraints, estimates the abstractions and the water balance at all hydrosystem control points, selecting the economical optimal management. The spatial analysis assumes a semi-distributed schematisation of the basin and its underlying aquifer, and also a rough description of the technical works, all employed via the use of geographical information systems. The time step of simulation is monthly or daily; in the last case, a routing model is optionally incorporated, based on the well-known Muskingum-Cunge method. Specific emphasis is given to the estimation of model parameters, by using statistical and empirical goodness-of-fit measures and evolutionary algorithms for single- and multi-objective optimisation. Finally, we present an application of the model to the Western Thessaly area.
Related project: Integrated Management of Hydrosystems in Conjunction with an Advanced Information System (ODYSSEUS)
Full text: http://www.itia.ntua.gr/en/getfile/755/1/documents/report_4a.pdf (3877 KB)
Other works that reference this work (this list might be obsolete):
| 1. | #Πετροπούλου, Μ., Ε. Ζαγγάνα, Ν. Χαριζόπουλος, Μ. Μιχαλοπούλου, Α. Μυλωνάς, και Κ. Περδικάρης, Εκτίμηση του υδρολογικού ισοζυγίου της λεκάνης απορροής του Πηνειού ποταμού Ηλείας με χρήση του μοντέλου «Ζυγός», 14ο Πανελλήνιο Συνέδριο της Ελληνικής Υδροτεχνικής Ένωσης (ΕΥΕ), Βόλος, 2019. |
D. Karpouzos, I. Kyriazopoulou, and I. Nalbantis, Specifications for the analysis, coding and costing of water uses, Integrated Management of Hydrosystems in Conjunction with an Advanced Information System (ODYSSEUS), Report 14, 69 pages, NAMA, Athens, June 2005.
In this report, the economic aspects of cost analysis and water pricing are described in detail. A classification of water uses and economic instruments applied in demand management and pollution control is given. Marginal cost pricing is analyzed and related to the "right" water price. Methodologies are provided for the estimation of full cost components (financial, environmental and resource cost). Water policies, in EU as well as worldwide, are investigated and structures-levels of water pricing are discussed regarding the main economical sectors of water use (domestic, industrial and agricultural). Finally, useful conclusions for the implementation of effective water policy-pricing in practice are extracted.
Related project: Integrated Management of Hydrosystems in Conjunction with an Advanced Information System (ODYSSEUS)
Full text: http://www.itia.ntua.gr/en/getfile/672/1/documents/report_14.pdf (1642 KB)
N. Malamos, and I. Nalbantis, Analysis of the water demand management practices, Integrated Management of Hydrosystems in Conjunction with an Advanced Information System (ODYSSEUS), Contractor: NAMA, Report 15, Department of Water Resources, Hydraulic and Maritime Engineering – National Technical University of Athens, Athens, June 2005.
The present technical report analyzes water demand and measures and works for water demand management. The objective of the report is to define the methodological framework, within which water demand management is considered part of the information system ODYSSEUS.
Related project: Integrated Management of Hydrosystems in Conjunction with an Advanced Information System (ODYSSEUS)
Full text: http://www.itia.ntua.gr/en/getfile/671/1/documents/report_15.pdf (1259 KB)
R. Mavrodimou, I. Nalbantis, and A. Efstratiadis, Guidelines for the assessment of water resource projects, Integrated Management of Hydrosystems in Conjunction with an Advanced Information System (ODYSSEUS), Contractor: NAMA, Report 13, 72 pages, Department of Water Resources, Hydraulic and Maritime Engineering – National Technical University of Athens, Athens, June 2005.
This attempt stands as a primary approach of a subject that has not been encountered from a holistic point-of-view in Greece and, more specifically, an impulse for further insight. The target is to establish guidelines for assessing the performance of existing large-scale water resource projects, within an integrated and adaptive water management. This effort is limited on certain categories of projects that are assumed more important in relation with the targets of the research project, which are: (a) surface water storage projects (i.e., dams), (b) groundwater abstraction projects (i.e., borehole systems), and (c) water distribution projects (i.e., irrigation and water supply networks). The report has the following structure: First, the general methodological framework is posed, including the essential definitions that provide better understanding of the various subjects. The reasons for the assessment are described, the selection of the project categories to analyse is explained, and the need for incorporating a single project to the extended hydrosystem is justified. But primarily, the methodological steps for the assessment procedure are described, and the main parameters of each step are articulated or further analysed, in some cases with specific weight. Next, the methodology is specialised for the selected project categories that are already referred, and particular targets are imposed, to which the guidelines are focused. These include the integration of the single projects to the scale of the corresponding hydrosystem; in this point, the report is related to the scope of the research project and, more precisely, to the models under development, for which the assessment procedure stands as one of the application fields. Finally, four characteristic examples are presented, which are taken from the Greek and international experience, thus facilitating the comprehension of the entire proposed procedure.
Related project: Integrated Management of Hydrosystems in Conjunction with an Advanced Information System (ODYSSEUS)
Full text: http://www.itia.ntua.gr/en/getfile/667/1/documents/report_13.pdf (1502 KB)
I. Nalbantis, N. Mamassis, D. Koutsoyiannis, and A. Efstratiadis, Final report, Modernisation of the supervision and management of the water resource system of Athens, Report 25, 135 pages, Department of Water Resources, Hydraulic and Maritime Engineering – National Technical University of Athens, Athens, March 2004.
The subject and the objectives of the integrated system for the modernisation of the supervising and management of the water resource system of Athens is presented along with the developed infrastructure, computational (geographical information system and central database) and measuring, and the organisation, processing and management of the necessary data. In addition, the software tools developed (Castalia, Hydrognomon, Hydronomeas and system for simulation of the hydrological cycle of the Boeoticos Kephisos - Yliki Basin), and the master plans for the management of the water resource system, which were elaborated in the framework of the second phase of the research project using these software tools, are also described. For all subsystems, reference is made to the operational integration of the system as a whole.
Related project: Modernisation of the supervision and management of the water resource system of Athens
Full text: http://www.itia.ntua.gr/en/getfile/621/1/documents/report25.pdf (3908 KB)
A. Efstratiadis, I. Nalbantis, and E. Rozos, Model for simulating the hydrological cycle in Boeoticos Kephisos and Yliki basins, Modernisation of the supervision and management of the water resource system of Athens, Report 21, 196 pages, Department of Water Resources, Hydraulic and Maritime Engineering – National Technical University of Athens, Athens, January 2004.
An integrated information system is developed for simulating main processes of the hydrological cycle in Boeoticos Kephisos Basin. Both surface (rainfall, evapotranspiration, direct runoff) and subsurface processes (percolation, spring runoff, outflow to the sea) are modeled. The surface hydrology model is an enhanced version of the well-known model of Thornthwaite. The Hydrological Response Unit (HRU) serves as the basis for modeling. This is a hydrologically homogeneous part of the basin (in regard to inputs). Groundwater flow is Darcian and is supposed to take place between tanks that are linked to each other through conduits. Besides the two models, a third model that allocates water demand - which is supposed concentrated at some consumption points - between various water resources. The information system consists of four subsystems: (a) the subsystem for entry and storage of data, (b) the subsystem for organizing and visualising data, (c) the subsystem for simulation of hydrological processes, and (d) the parameter calibration subsystem. In an annex, extensive guidelines for the system's users are given. The models were calibrated and validated for the Boeoticos Kephisos Basin. This volume contains also extensive analyses of the hydrometeorological and hydrological information in the Boeoticos Kephisos Basin which led to maximising the quality of inputs to the system. Last, great effort was put in an exploratory analysis of various data of both Lake Yliki and its own basin which could not support any detailed model - even a semi-distributed one. Analysis led to a simple model for the lake's leakages which is significantly ameliorated in regard to older approaches. Also, comments are made on the potential of aquifers other than that of the Boeoticos Kephisos Basin. These aquifers are reserved mostly for water supply of the Athens Metropolitan Area.
Related project: Modernisation of the supervision and management of the water resource system of Athens
Full text: http://www.itia.ntua.gr/en/getfile/617/1/documents/report21.pdf (3007 KB)
Additional material:
Other works that reference this work (this list might be obsolete):
| 1. | #Michas, S.N., M.N. Pikounis, I. Nalbantis, P.L. Lazaridou and E.I. Daniil, On the hydrologic analysis for water resources management in Aegean Islands, Proceedings, Protection and Restoration of the Environment VIII, Mykonos, Greece, 2006. |
D. Koutsoyiannis, I. Nalbantis, G. Karavokiros, A. Efstratiadis, N. Mamassis, A. Koukouvinos, A. Christofides, E. Rozos, A. Economou, and G. M. T. Tentes, Methodology and theoretical background, Modernisation of the supervision and management of the water resource system of Athens, Report 15, Department of Water Resources, Hydraulic and Maritime Engineering – National Technical University of Athens, Athens, January 2004.
The methodology that was developed for the analysis of the water supply system of Athens, even though it was dictated by the special requirements of this particular system, has a broader character and a generalised orientation. In this respect, a series of publications in international scientific journals and communications in scientific conferences and workshops were done, so that the methodology becomes known to the international scientific community and raises its critique. These publications and communications are classified into two categories, with the fist one containing those referring to the core of the water supply system analysis, i.e., to the system optimisation based on the original methodology parameterisation-simulation-optimisation, and the second one containing those dealing with stochastic simulation and prediction of the hydrological inputs to the system. For a clear description and explanation of the methodology, the publications in scientific journals are reproduced in this volume and, for completeness, the summaries of the communications in conferences are included as well.
Related project: Modernisation of the supervision and management of the water resource system of Athens
Ministry of Development, NTUA, Institute of Geological and Mining Research, and Centre for Research and Planning, Master plan for water resource management of the country, Completion of the classification of quantitative and qualitative parameters of water resources in water districts of Greece, Contractor: Department of Water Resources, Hydraulic and Maritime Engineering – National Technical University of Athens, 549 pages, Ministry of Development, Athens, January 2003.
Remarks:
See the newer version of this report:
National Programme for Water Resources Management and Preservation
Related project: Completion of the classification of quantitative and qualitative parameters of water resources in water districts of Greece
Full text:
D. Koutsoyiannis, A. Efstratiadis, G. Karavokiros, A. Koukouvinos, N. Mamassis, I. Nalbantis, E. Rozos, Ch. Karopoulos, A. Nassikas, E. Nestoridou, and D. Nikolopoulos, Master plan of the Athens water resource system — Year 2002–2003, Modernisation of the supervision and management of the water resource system of Athens, Report 14, 215 pages, Department of Water Resources, Hydraulic and Maritime Engineering – National Technical University of Athens, Athens, December 2002.
Related project: Modernisation of the supervision and management of the water resource system of Athens
Full text: http://www.itia.ntua.gr/en/getfile/552/1/documents/2002eydapmasterplan.pdf (8797 KB)
D. Koutsoyiannis, A. Efstratiadis, G. Karavokiros, A. Koukouvinos, N. Mamassis, I. Nalbantis, D. Grintzia, N. Damianoglou, Ch. Karopoulos, S. Nalpantidou, A. Nassikas, D. Nikolopoulos, A. Xanthakis, and K. Ripis, Master plan of the Athens water resource system — Year 2001–2002, Modernisation of the supervision and management of the water resource system of Athens, Contractor: Department of Water Resources, Hydraulic and Maritime Engineering – National Technical University of Athens, Report 13, Athens, December 2001.
Related project: Modernisation of the supervision and management of the water resource system of Athens
Full text: http://www.itia.ntua.gr/en/getfile/487/2/documents/report13.pdf (8130 KB)
Additional material:
Other works that reference this work (this list might be obsolete):
| 1. | #Collins, R., P. Kristensen and N. Thyssen, Water Resources Across Europe—Confronting Water Scarcity and Drought, ISSN 1725-9177, 56 pp., European Environment Agency (EEA), Copenhagen, 2009. |
I. Nalbantis, and E. Rozos, A system for the simulation of the hydrological cycle in the Boeoticos Kephisos basin, Modernisation of the supervision and management of the water resource system of Athens, Report 10, 72 pages, Department of Water Resources, Hydraulic and Maritime Engineering – National Technical University of Athens, Athens, December 2000.
A computer package is built to simulate groundwater flow in the Boeoticos Kifisos River Basin. This is carried out by a research team at the NTUA within the frame of the project entitled "Modernization of the supervision and management of the water resources for water supply of Athens". Stochastic groundwater flow simulation and forecasting is based on the MODFLOW model of the USGS which had been calibrated in a previous study by the Ministry of Environment, Town Planning and Public Works. Suitable computer programs are written to adapt the model package to the operational needs which include stochastic simulation of rainfall. Finally, the adapted package is applied to the karstic aquifer system of Boeoticos Kifissos Basin for a typical scenario with average hydrologic conditions and projected water requirements for irrigation and water supply within the basin and high (and zero) withdrawals through the Vassilika - Parori boreholes which supply water to Athens.
Related project: Modernisation of the supervision and management of the water resource system of Athens
Full text: http://www.itia.ntua.gr/en/getfile/417/1/documents/report10.pdf (2157 KB)
A. Efstratiadis, I. Nalbantis, and N. Mamassis, Hydrometeorological data processing, Modernisation of the supervision and management of the water resource system of Athens, Report 8, 129 pages, Department of Water Resources, Hydraulic and Maritime Engineering – National Technical University of Athens, Athens, December 2000.
The hydrometeorological data analysis for the estimation of the areal rainfall and evaporation and the runoff for specific discharge measurement stations is described. Also, the reservoir water balances are presented, which were established for the estimation of the reservoir inflows or leakage losses. Specifically, the processing of the monthly rainfall data, the estimation of monthly evaporation from the reservoirs, the calculation of the discharge at a station of Evinos' River Basin and the setting up of the monthly water balance, are presented. Finally, the raw and calculated data are included in the annexes.
Related project: Modernisation of the supervision and management of the water resource system of Athens
Full text: http://www.itia.ntua.gr/en/getfile/416/1/documents/report8.pdf (1139 KB)
Other works that reference this work (this list might be obsolete):
| 1. | Nalbantis, I., and G. Tsakiris, Assessment of hydrological drought revisited, Water Resources Management, 23, 881-897, 2009. |
| 2. | Nalbantis, I., Evaluation of a hydrological drought index, European Water, 23/24, 67-77, 2008. |
| 3. | Sardou, S. F., and A. Bahremand, Hydrological drought analysis using SDI Index in Halilrud basin of Iran, Environmental Resources Research, 2(1), 47-56, 2014. |
G. Karavokiros, A. Efstratiadis, A. Koukouvinos, N. Mamassis, I. Nalbantis, N. Damianoglou, K. Constantinidou, S. Nalpantidou, A. Xanthakis, and S Politaki, Analysis of the system requirements, Modernisation of the supervision and management of the water resource system of Athens, Report 1, 74 pages, Department of Water Resources, Hydraulic and Maritime Engineering – National Technical University of Athens, Athens, January 2000.
Within the frame of the project entitled "Updating of the supervision and management of the water supply resources system of Athens" five software systems that are developed are specified. The first one is the Geographical Information System, which aims to model and to supervise the hydrosystem of Athens. The second one is a network of hydrometeorological measuring stations in the catchments, which are linked to the water resource system of Athens are specified. The third system is used for the estimation of inflow and losses of the reservoirs, where the forth one estimates and predicts the water resources in the aquifers of the Viotikos Kifissos and Yliki region. Finally, the fifth system supports the management of water resources. The specifications described are used as a guideline for the development of the above systems.
Related project: Modernisation of the supervision and management of the water resource system of Athens
Full text: http://www.itia.ntua.gr/en/getfile/410/1/documents/report1.pdf (694 KB)
D. Koutsoyiannis, A. Efstratiadis, G. Karavokiros, A. Koukouvinos, N. Mamassis, I. Nalbantis, D. Grintzia, N. Damianoglou, A. Xanthakis, S Politaki, and V. Tsoukala, Master plan of the Athens water resource system - Year 2000-2001, Modernisation of the supervision and management of the water resource system of Athens, Contractor: Department of Water Resources, Hydraulic and Maritime Engineering – National Technical University of Athens, Report 5, 165 pages, Athens, December 2000.
The master plan for the operation of the Athens water resource system for the hydrological year 2000-20001 deals first with issues on the relations between the different organisations involved in the water supply of Athens, i.e., the Water Supply and Sewage Company of Athens, the Infrastructure Company for Water Supply and Sewage of Athens and a number of ministries. Projections of the water demand and the related water resources availability are studied in the form of future scenarios for which optimised system operating rules are drawn. The scenarios consider the phenomenon of the drought persistence as well as various possible emergency incidents. Operating cost estimates are also given together with elements on the environmental dimensions of the subject. Finally, estimates of the system safe yield and of the energy consumption for pumping water are presented in detail.
Related project: Modernisation of the supervision and management of the water resource system of Athens
Full text: http://www.itia.ntua.gr/en/getfile/356/1/documents/2000EYDAPMasterplan.pdf (1616 KB)
Additional material:
Other works that reference this work (this list might be obsolete):
| 1. | #Getimis, P., K. Bithas and D. Zikos, Key actors, institutional framework and participatory procedures, for the sustainable use of water in Attica-basin, Proc. 7th Conference on Environmental Science and Technology, Syros, Greece, 243-252, 2001. |
| 2. | #Minasidou K., D. F. Lekkas, A. D. Nikolaou, and S. K. Golfinopoulos, Water quality changes during storage - the case of Mornos reservoir, Proceedings, Protection and Restoration of the Environment VIII, Mykonos, Greece, 2006. |
| 3. | Stergiouli, M. L., and K. Hadjibiros, The growing water imprint of Athens (Greece) throughout history, Regional Environmental Change, 12(2), 337-345, 2012. |
I. Nalbantis, and D. Koutsoyiannis, Final Report of Phase C, Evaluation of Management of the Water Resources of Sterea Hellas - Phase 3, Report 41, 100 pages, Department of Water Resources, Hydraulic and Maritime Engineering – National Technical University of Athens, Athens, January 1999.
Related project: Evaluation of Management of the Water Resources of Sterea Hellas - Phase 3
Full text:
I. Nalbantis, and R. Mavrodimou, Assesment of water requirements, Evaluation of Management of the Water Resources of Sterea Hellas - Phase 3, Report 37, 63 pages, Department of Water Resources, Hydraulic and Maritime Engineering – National Technical University of Athens, Athens, January 1999.
Related project: Evaluation of Management of the Water Resources of Sterea Hellas - Phase 3
Full text: http://www.itia.ntua.gr/en/getfile/132/1/documents/er4_37.pdf (5432 KB)
I. Nalbantis, Water Resources, Evaluation of Management of the Water Resources of Sterea Hellas - Phase 3, Report 35, 54 pages, Department of Water Resources, Hydraulic and Maritime Engineering – National Technical University of Athens, Athens, January 1999.
Related project: Evaluation of Management of the Water Resources of Sterea Hellas - Phase 3
Full text: http://www.itia.ntua.gr/en/getfile/130/1/documents/er4_35.pdf (5529 KB)
I. Nalbantis, and D. Koutsoyiannis, Final Report, Upgrading and updating of hydrological information of Thessalia, Report 4, 78 pages, Department of Water Resources, Hydraulic and Maritime Engineering – National Technical University of Athens, Athens, March 1997.
Related project: Upgrading and updating of hydrological information of Thessalia
Full text: http://www.itia.ntua.gr/en/getfile/186/1/documents/er5_4.pdf (16354 KB)
Other works that reference this work (this list might be obsolete):
| 1. | Panagopoulos, Y. , C. Makropoulos, A. Gkiokas, M. Kossida, L. Evangelou, G. Lourmas, S. Michas, C. Tsadilas, S. Papageorgiou, V. Perleros, S. Drakopoulou, M. Mimikou, Assessing the cost-effectiveness of irrigation water management practices in water stressed agricultural catchments: The case of Pinios, Agricultural Water Management, 139, 31-42, 2014. |
Team of the YBET96 project, Master plan for the country's water resource management, Classification of quantitative and qualitative parameters of the water resources of Greece using geographical information systems, Contractor: Department of Water Resources, Hydraulic and Maritime Engineering – National Technical University of Athens, 339 pages, Ministry of Development, Athens, November 1996.
Related works:
Related project: Classification of quantitative and qualitative parameters of the water resources of Greece using geographical information systems
AFORISM final report authoring team, Final report, AFORISM: A comprehensive forecasting system for flood risk mitigation and control, Contractor: University of Bologna, 568 pages, Department of Water Resources, Hydraulic and Maritime Engineering – National Technical University of Athens, Bologna, April 1996.
Related project: AFORISM: A comprehensive forecasting system for flood risk mitigation and control
Full text:
N. Mamassis, and I. Nalbantis, Study of hydrological balances, Evaluation of Management of the Water Resources of Sterea Hellas - Phase 2, Report 20, 118 pages, Department of Water Resources, Hydraulic and Maritime Engineering – National Technical University of Athens, Athens, September 1995.
Related project: Evaluation of Management of the Water Resources of Sterea Hellas - Phase 2
Full text: http://www.itia.ntua.gr/en/getfile/63/1/documents/er4_20.pdf (11021 KB)
I. Nalbantis, Methodology of water balance analysis, Evaluation of Management of the Water Resources of Sterea Hellas - Phase 2, Report 16, 41 pages, Department of Water Resources, Hydraulic and Maritime Engineering – National Technical University of Athens, Athens, September 1995.
Related project: Evaluation of Management of the Water Resources of Sterea Hellas - Phase 2
Full text: http://www.itia.ntua.gr/en/getfile/58/1/documents/er4_16.pdf (3688 KB)
N. Papakostas, and I. Nalbantis, Report, Development of a relational data base for management and processing of hydrometric information, Department of Water Resources, Hydraulic and Maritime Engineering – National Technical University of Athens, Athens, July 1994.
Related project: Development of a relational data base for management and processing of hydrometric information
Full text: http://www.itia.ntua.gr/en/getfile/408/1/documents/er50_1.pdf (2763 KB)
NTUA Hydroscope Team, HYDROSCOPE, User manual for the database and applications for hydrology and meteorology, Hydroscope: Creation of a National Databank for Hydrological and Meteorological Information, Contractor: Department of Water Resources, Hydraulic and Maritime Engineering – National Technical University of Athens, 180 pages, National Technical University of Athens, Athens, December 1994.
Related project: Hydroscope: Creation of a National Databank for Hydrological and Meteorological Information
Full text: http://www.itia.ntua.gr/en/getfile/338/1/documents/er1_1-73.pdf (13830 KB)
Th. Xanthopoulos, D. Koutsoyiannis, and I. Nalbantis, Third Annual Report (1993-1994), Contribution of the National Technical University of Athens research team, AFORISM: A comprehensive forecasting system for flood risk mitigation and control, Contractor: University of Bologna, 13 pages, Bologna, 1994.
Related project: AFORISM: A comprehensive forecasting system for flood risk mitigation and control
Full text:
G. Kavvadias, S. Tzovaridis, I. Nalbantis, and N. Mamassis, Fitting the Stage-Discharge Curves, Hydroscope: Creation of a National Databank for Hydrological and Meteorological Information, Report 8/4, 25 pages, Department of Water Resources, Hydraulic and Maritime Engineering – National Technical University of Athens, Athens, December 1993.
Related project: Hydroscope: Creation of a National Databank for Hydrological and Meteorological Information
Full text: http://www.itia.ntua.gr/en/getfile/305/1/documents/er1_8-4.pdf (2706 KB)
I. Nalbantis, and S. Tsimpidis, Data storage levels for raw and processed information, and related processing requirements, Hydroscope: Creation of a National Databank for Hydrological and Meteorological Information, Report 1/11, 18 pages, Department of Water Resources, Hydraulic and Maritime Engineering – National Technical University of Athens, Athens, May 1993.
Related project: Hydroscope: Creation of a National Databank for Hydrological and Meteorological Information
Full text: http://www.itia.ntua.gr/en/getfile/303/1/documents/er1_1-11.pdf (2102 KB)
I. Nalbantis, K. Pipili, and G. Tsakalias, International experience on archiving and processing of stage, discharge and sediment transport data, Hydroscope: Creation of a National Databank for Hydrological and Meteorological Information, Contractor: Department of Water Resources, Hydraulic and Maritime Engineering – National Technical University of Athens, Report 1/14, 29 pages, National Technical University of Athens, Athens, June 1993.
Related project: Hydroscope: Creation of a National Databank for Hydrological and Meteorological Information
Full text: http://www.itia.ntua.gr/en/getfile/297/1/documents/er1_1-14.pdf (3003 KB)
Th. Xanthopoulos, D. Koutsoyiannis, and I. Nalbantis, First Annual Report (1991-1992), Contribution of the National Technical University of Athens research team, AFORISM: A comprehensive forecasting system for flood risk mitigation and control, Contractor: University of Bologna, 74 pages, Department of Water Resources, Hydraulic and Maritime Engineering – National Technical University of Athens, Bologna, June 1992.
Related project: AFORISM: A comprehensive forecasting system for flood risk mitigation and control
Full text:
D. Koutsoyiannis, and I. Nalbantis, Final Report of Phase A, Evaluation of Management of the Water Resources of Sterea Hellas - Phase 1, Report 10, 71 pages, Department of Water Resources, Hydraulic and Maritime Engineering – National Technical University of Athens, Athens, October 1992.
Related project: Evaluation of Management of the Water Resources of Sterea Hellas - Phase 1
Full text: http://www.itia.ntua.gr/en/getfile/11/1/documents/er4_10.pdf (7030 KB)
I. Nalbantis, Computer programmes for simulation of the rainfall-runoff relationship, Evaluation of Management of the Water Resources of Sterea Hellas - Phase 1, Report 8, 106 pages, Department of Water Resources, Hydraulic and Maritime Engineering – National Technical University of Athens, Athens, October 1992.
Related project: Evaluation of Management of the Water Resources of Sterea Hellas - Phase 1
Full text: http://www.itia.ntua.gr/en/getfile/9/1/documents/er4_8.pdf (7204 KB)
I. Nalbantis, D. Koutsoyiannis, and Th. Xanthopoulos, Final report, Assessment of methodology and results, A pilot study for the management of the Louros and Arachthos watersheds, Department of Water Resources, Hydraulic and Maritime Engineering – National Technical University of Athens, Athens, April 1991.
Related project: A pilot study for the management of the Louros and Arachthos watersheds
Full text: http://www.itia.ntua.gr/en/getfile/260/1/documents/er10_1.pdf (1302 KB)
D. Koutsoyiannis, I. Nalbantis, and C. Tsolakidis, Operation scheduling of the existing water supply system, Appraisal of existing potential for improving the water supply of greater Athens - Phase 2, Report 16, 75 pages, Department of Water Resources, Hydraulic and Maritime Engineering – National Technical University of Athens, Athens, June 1990.
Related project: Appraisal of existing potential for improving the water supply of greater Athens - Phase 2
Full text: http://www.itia.ntua.gr/en/getfile/163/1/documents/er3_16.pdf (5695 KB)
I. Nalbantis, Hydrological design of the Evinos Reservoirs, Appraisal of existing potential for improving the water supply of greater Athens - Phase 2, Report 15, 83 pages, Department of Water Resources, Hydraulic and Maritime Engineering – National Technical University of Athens, Athens, June 1990.
Related project: Appraisal of existing potential for improving the water supply of greater Athens - Phase 2
Full text: http://www.itia.ntua.gr/en/getfile/161/1/documents/er3_15.pdf (6685 KB)
I. Nalbantis, Water Supply System Modelling, Appraisal of existing potential for improving the water supply of greater Athens - Phase 2, Report 14, 133 pages, Department of Water Resources, Hydraulic and Maritime Engineering – National Technical University of Athens, Athens, June 1990.
Related project: Appraisal of existing potential for improving the water supply of greater Athens - Phase 2
Full text: http://www.itia.ntua.gr/en/getfile/160/1/documents/er3_14.pdf (12377 KB)
D. Koutsoyiannis, N. Mamassis, and I. Nalbantis, Stochastic simulation of hydrological variables, Appraisal of existing potential for improving the water supply of greater Athens - Phase 2, Report 13, 313 pages, Department of Water Resources, Hydraulic and Maritime Engineering – National Technical University of Athens, Athens, March 1990.
Related project: Appraisal of existing potential for improving the water supply of greater Athens - Phase 2
Full text:
D. Koutsoyiannis, and I. Nalbantis, Capacity assessment of the present Mornos-Yliki supply system, Appraisal of existing potential for improving the water supply of greater Athens - Phase 2, Report 8, 87 pages, Department of Water Resources, Hydraulic and Maritime Engineering – National Technical University of Athens, Athens, October 1989.
Related project: Appraisal of existing potential for improving the water supply of greater Athens - Phase 2
Full text: http://www.itia.ntua.gr/en/getfile/152/1/documents/er3_8.pdf (8201 KB)
D. Koutsoyiannis, I. Nalbantis, N. Mamassis, A. Efstratiadis, L. Lazaridis, and A. Daniil, Flood study, Engineering consultant for the project "Water supply of Heracleio and Agios Nicolaos from the Aposelemis dam", Commissioner: Ministry of Environment, Planning and Public Works, Contractor: Aposelemis Joint Venture, Athens, October 2001.
The objective of the study is the estimation of the design floods of the spillway and the diversion tunnel of the Aposelemis dam. The study is based mainly on regional rainfall and meteorological data. Initially, the data is analysed applying probabilistic techniques as well as the probable maximum precipitation concept, in order to estimate the characteristics of design storms. Next, a unit hydrograph of the catchment is synthesised and using this unit hydrograph and the design storms, the design floods at the dam site are estimated for various return periods. Finally, these floods are routed through the spillway in order to estimate the characteristics of the outflow hydrograph.
Related project: Engineering consultant for the project "Water supply of Heracleio and Agios Nicolaos from the Aposelemis dam"
Full text:
D. Koutsoyiannis, A. Efstratiadis, N. Mamassis, I. Nalbantis, and L. Lazaridis, Hydrological study of reservoir operation, Engineering consultant for the project "Water supply of Heracleio and Agios Nicolaos from the Aposelemis dam", Commissioner: Ministry of Environment, Planning and Public Works, Contractor: Aposelemis Joint Venture, Athens, October 2001.
The scope of the study is the analytic and systematic approach of the Aposelemis reservoir operation, based on probabilistic/stochastic analysis, which aims at complementing the previous studies and giving reliable estimations of the reservoir's safe release. The study gives emphasis to the estimation of the contribution of the surface water resources of Lasithi Plateau basin to the reservoir's water potential, which is affected by the hydraulic communication between the basins of Lasithi Plateau and Aposelemis due to their karstic geologic background. For this purpose, extensive collection and processing of historical hydrological records were required, in addition to the development and calibration of a conceptual hydrological model for both watersheds. The estimation of the safe reservoir release is based on a stochastic model for the generation of synthetic inflow series and a simplified simulation-optimisation model of the hydrosystem composed of Lasithi plateau - Aposelemis reservoir - boreholes - urban and rural consumption. By applying the above models, several safe yield scenarios are examined, referring to alternative values of the physical hydraulic communication between the two basins and different system reliability levels.
Related project: Engineering consultant for the project "Water supply of Heracleio and Agios Nicolaos from the Aposelemis dam"
Full text:
Other works that reference this work (this list might be obsolete):
| 1. | #Vogiatzi, C., and C. Loupasakis, Environmental impact from the construction and operation of Aposelemis dam and tunnel, in Northern‐Eastern Crete, 1st International Conference on Environmental Design (ICED2020), 423-430, 2020. |
D. Koutsoyiannis, N. Mamassis, D. Zarris, J. Gavriilidis, T. Papathanasiadis, and I. Nalbantis, Flow measurements and estimation of losses from DXX irrigation canal of Lower Acheloos, Estimation of losses from DXX canal in the irrigation network of Lower Acheloos, Commissioner: Division of Land Reclamation Works – General Secretariat of Public Works – Ministry of Environment, Planning and Public Works, Contractor: NAMA, 20 pages, Division of Land Reclamation Works – General Secretariat of Public Works – Ministry of Environment, Planning and Public Works, 1999.
Related project: Estimation of losses from DXX canal in the irrigation network of Lower Acheloos
Full text: http://www.itia.ntua.gr/en/getfile/138/1/documents/1999KatoAxeloosDXX.pdf (503 KB)
I. Nalbantis, N. Mamassis, and D. Koutsoyiannis, Hydrological investigations of the Santorine watersheds, Concerted actions for the sector of environment in Santorine and Therasia islands, Commissioner: Cohesion Fund EU, Contractors: NAMA, SPEED, VLAR, 1998.
Related project: Concerted actions for the sector of environment in Santorine and Therasia islands
I. Nalbantis, N. Mamassis, and D. Koutsoyiannis, Hydrological investigation - Part B: Investigation of flow duration characteristics, Engineering study of the hydraulic project of old and new river bed of Peneios in Larisa, Commissioner: Ministry of Environment, Planning and Public Works, Contractors: Th. Gofas and Partners, Petra Synergatiki, D. Koutsoudakis, Helliniki Meletitiki, G. Kafetzopoulos - D. Benakis - I. Printatko, 100 pages, 1997.
Related works:
Related project: Engineering study of the hydraulic project of old and new river bed of Peneios in Larisa
Full text: http://www.itia.ntua.gr/en/getfile/239/1/documents/1997LarisaB.pdf (688 KB)
I. Nalbantis, N. Mamassis, and D. Koutsoyiannis, Hydrological investigation - Part A, Engineering study of the hydraulic project of old and new river bed of Peneios in Larisa, Commissioner: Ministry of Environment, Planning and Public Works, Contractors: Th. Gofas and Partners, Petra Synergatiki, D. Koutsoudakis, Helliniki Meletitiki, G. Kafetzopoulos - D. Benakis - I. Printatko, 148 pages, 1997.
Related project: Engineering study of the hydraulic project of old and new river bed of Peneios in Larisa
Full text: http://www.itia.ntua.gr/en/getfile/157/1/documents/1997LarisaA.pdf (983 KB)
P. Panagopoulos, A. Dakanalis, K. Triantafillou, D. Mertziotis, I. Nalbantis, N. Mamassis, G. Tsakalias, and D. Koutsoyiannis, Final Report, Water resources management of the Evinos river basin and hydrogeological study of the Evinos karstic system, Commissioner: Directorate of Water Supply and Sewage – General Secretariat of Public Works – Ministry of Environment, Planning and Public Works, Contractors: P. Panagopoulos, General Studies, Istria, Ecosystems Analysis, 1996.
Related project: Water resources management of the Evinos river basin and hydrogeological study of the Evinos karstic system
Full text: http://www.itia.ntua.gr/en/getfile/1474/1/documents/1996Meleti_diaxirisis_Evinou.pdf (39435 KB)
I. Nalbantis, N. Mamassis, and D. Koutsoyiannis, Hydrological study, Water resources management of the Evinos river basin and hydrogeological study of the Evinos karstic system, Commissioner: Directorate of Water Supply and Sewage – General Secretariat of Public Works – Ministry of Environment, Planning and Public Works, Contractors: P. Panagopoulos, General Studies, Istria, Ecosystems Analysis, Report number II, Athens, 1996.
Related project: Water resources management of the Evinos river basin and hydrogeological study of the Evinos karstic system
Full text: http://www.itia.ntua.gr/en/getfile/209/1/documents/1996ydrolohiki_meleti_Evinou.pdf (18161 KB)
D. Koutsoyiannis, N. Mamassis, and I. Nalbantis, Appraisal of the surface water potential and its exploitation in the Acheloos river basin and in Thessaly, Ch. 5 of Study of Hydrosystems, Integrated study of the environmental impacts from Acheloos diversion, Contractor: Directorate for Acheloos Diversion Works – General Secretariat of Public Works – Ministry of Environment, Planning and Public Works, Collaborators: Ydroexigiantiki, 150 pages, 1995.
Related project: Integrated study of the environmental impacts from Acheloos diversion
Full text: http://www.itia.ntua.gr/en/getfile/215/1/documents/KEF5A.pdf (586 KB)
Additional material:
D. Koutsoyiannis, I. Nalbantis, and N. Mamassis, Hydrological investigation - Annex, Engineering study for improving the water supply of Athens with the construction of a dam at the Evinos River, Commissioner: Directorate of Water Supply and Sewage – General Secretariat of Public Works – Ministry of Environment, Planning and Public Works, Contractors: OTME, Ydroilektriki, YDROTEK, D. Constantinidis, G. Karavokiris, Th. Gofas and Partners, 82 pages, 1991.
Related works:
Related project: Engineering study for improving the water supply of Athens with the construction of a dam at the Evinos River
Full text: http://www.itia.ntua.gr/en/getfile/219/1/documents/1991EvinosProsartima.pdf (3463 KB)
Additional material:
D. Koutsoyiannis, I. Nalbantis, and N. Mamassis, Hydrological investigation - Appendices E-F, Engineering study for improving the water supply of Athens with the construction of a dam at the Evinos River, Commissioner: Directorate of Water Supply and Sewage – General Secretariat of Public Works – Ministry of Environment, Planning and Public Works, Contractors: OTME, Ydroilektriki, YDROTEK, D. Constantinidis, G. Karavokiris, Th. Gofas and Partners, 204 pages, 1991.
Related works:
Related project: Engineering study for improving the water supply of Athens with the construction of a dam at the Evinos River
Full text: http://www.itia.ntua.gr/en/getfile/218/1/documents/1991EvinosParartEST.pdf (5526 KB)
Additional material:
D. Koutsoyiannis, I. Nalbantis, and N. Mamassis, Hydrological investigation - Appendices A-D, Engineering study for improving the water supply of Athens with the construction of a dam at the Evinos River, Commissioner: Directorate of Water Supply and Sewage – General Secretariat of Public Works – Ministry of Environment, Planning and Public Works, Contractors: OTME, Ydroilektriki, YDROTEK, D. Constantinidis, G. Karavokiris, Th. Gofas and Partners, 233 pages, 1991.
Related works:
Related project: Engineering study for improving the water supply of Athens with the construction of a dam at the Evinos River
Full text: http://www.itia.ntua.gr/en/getfile/217/1/documents/1991EvinosParartAD.pdf (9250 KB)
Additional material:
D. Koutsoyiannis, I. Nalbantis, and N. Mamassis, Hydrological investigation - Report, Engineering study for improving the water supply of Athens with the construction of a dam at the Evinos River, Commissioner: Directorate of Water Supply and Sewage – General Secretariat of Public Works – Ministry of Environment, Planning and Public Works, Contractors: OTME, Ydroilektriki, YDROTEK, D. Constantinidis, G. Karavokiris, Th. Gofas and Partners, 192 pages, 1991.
Related project: Engineering study for improving the water supply of Athens with the construction of a dam at the Evinos River
Full text: http://www.itia.ntua.gr/en/getfile/216/1/documents/1991EvinosReport.pdf (21561 KB)