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Title: THE GENERATION OF KARST FLASH FLOODS AND THE ANALYSIS OF THEIR MAIN HYDROLOGIC PARAMETERS; CASE STUDY OF THE KOILIARIS RIVER BASIN IN CRETE, GREECE

Author: N. N. Kourgialas and G. P. Karatzas

Year: 2009

Publisher: European Water Resources Association (EWRA)

Description:

The objective of the present work is to determine the hydrological and meteorological parameters related to karst and non-karst flood phenomena. A karst flash flood is special kind of flash flood and represents one of the deadliest and costliest natural disasters worldwide. The hydrological analysis of a karst flash flood event contributes in the understanding of the runoff creation process. Karst flash flood studies, presented in the past, are based on daily data; nevertheless the accuracy of these data is not satisfactory for the detailed analysis of a flood event. For this reason the analysis of the rainfall and runoff data in hourly base is necessary. This study presents the analysis of a karst and two non karst flash flood events that took place in the Koiliaris river basin. The area of the basin has been estimated to be approximately 130 km2. In the basin there are three telemetric hydrometric stations and two telemetric meteorological stations. These stations provide hourly real-time data which are used to determine hydrological and meteorological parameters. The main characteristics of various hydrographs specified in this study are the runoff coefficients, the lag time, the concentration time, and the basin mean maximum potential retention. The specification of these hydrometeorological parameters provides us with the necessary information in order to successfully manage and control karst flash flood events.