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Studying the hydro-meteorological extremes. The benefits from the European flash flood research oriented hydrate project

Tsanis Giannis, Koutroulis Aristeidis, Daliakopoulos Ioannis, Gryllakis Emmanouil

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Summary

The present paper summarizes the advances of flash flood research forthe Greek case study, within the frame of HYDRATE EC funded project. Asa first step, a collation of homogenous primary data on flash floodsoccurred in Greece based on various data sources resulted in 21documented events, enriching the HYDRATE database. Specific major eventswere selected for further detailed data collation and analysis. A commonintensive post event field survey was conducted by various researcherswith different skills and experience, in order to document the 18th ofSeptember 2007, Western Slovenia flash flood event. The observationstrategy and the lessons learned during this campaign were appliedsuccessfully for surveying an event in Crete. Two flash flood eventsoccurred in Crete were selected for detailed analysis, the 13th ofJanuary 1994 event occurred in Giofiros basin and the 17th of October2006 event occurred in Almirida basin. Several techniques, likedistributed rainfall-runoff modelling, hydraulic modelling, indirect andempirical peak discharge estimation, were applied for the understandingof the dominant flash flood processes and the effect of initialconditions on peak discharge. In a more general framework, theseasonality of the hydrometeorologic characteristics of floods thatoccurred in Crete during the period 1990-2007 and the atmosphericcirculation conditions during the flood events were examined. During thethree and a half years research period, many lessons have learnt from afruitful collaboration among the project partners. HYDRATE projectimproved the scientific basis of flash flood research and providedresearch knowledge on flood risk management.

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