Exploration of storm's space-time evolution

X. Kafetzidakis, Exploration of storm's space-time evolution, Diploma thesis, March 2011.



The present graduate study examines the time and spatial development of intense rainfall in different scales (both in time and space). The study area is located in the watershed of Kifisos River of Attica in Greece. In this area is planted a dense network of rain gauges ([METEONET]), which provides data of small time scale. In this study three intense day-duration rainfall episodes of ten-minute time interval were used to produce graphs of rain (of ten-minute, half-hour and one-hour time interval) in each hydrometric station of the area.

The point rain heights of the graphs were later changed into surface rainfall using four different territorial interjection methods. As a result, rainfall surfaces of ten-minute, half-hour and one-hour time duration were formed through GIS program ArcGIS, which offers better monitoring of the progress of intense rainfall episodes in time and in space. Thus, it was possible to estimate the maximum rain in different spatial scales (0.06 km2, 1.56 km2, 6.25 km2, 39.06 km2, 156.25 km2, 360.8 km2).

Based on the exported data from these techniques, the surface reduction factor (medium surface rain height divided by the maximum point rain height) was also computed for various space and time scales. Its comparison with the corresponding empirical factor in bibliography led to certain conclusions with regard to their effectiveness and adaptation in conditions of Greece.

Finally, an attempt was made to develop an empirical relation connecting rainfall intensity with time and area, which demands further research.

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