Flow-duration analysis in the context of preliminary design of small hydropower plants: from uncertainty assessment to regionalization

K. Ntemiri, A. Pytharouliou, C. Ntemiroglou, I. Tsoukalas, A. Efstratiadis, and D. Koutsoyiannis, Flow-duration analysis in the context of preliminary design of small hydropower plants: from uncertainty assessment to regionalization, European Geosciences Union General Assembly 2020, Geophysical Research Abstracts, Vol. 22, Vienna, 2020.

[doc_id=2023]

[English]

The preliminary design of small hydropower plants is typically employed on the basis of empirically-derived flow-duration curves (FDCs). This allows for estimating characteristic quantities of interest, such as the mean annual energy production, the mean annual water volume captured by the turbines and the mean annual time of turbine operation. In this work, we aim to parameterize the daily FDCs in statistical terms, i.e. by fitting suitable distribution functions and express their uncertainty through confidence intervals. The fitting procedure emphasizes to the accurate representation of the core of the distribution, since neither the higher flows nor the lower ones can be exploited by hydropower plants without sufficient storage capacity. The parametric FDCs are next used to provide statistical predictions of the desirable design variables. The methodology is applied to a sample of Mediterranean catchments with different hydroclimatic and geomorphological characteristics. Based on the outcomes of this analysis, we also attempt to establish regional relationships, by associating key statistical and design quantities with lumped properties and hydrological signatures of the studied catchments.