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Relations between streamflow indices, rainfall characteristics and catchment physical descriptors for flash flood events

Garambois, Pierre-André and Roux, Hélène and Larnier, Kévin and Dartus, Denis Relations between streamflow indices, rainfall characteristics and catchment physical descriptors for flash flood events. (2011) In: Weather Radar and Hydrology - WRaH 2011, 18-21 Apr 2011, Exeter, UK .

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Abstract

Flash flood is a very intense and quick hydrologic response of a catchment to rainfall. This phenomenon has a high spatial-temporal variability as the generating storm often hits small catchments (few km²). Given the small spatial temporal scales and high variability of flash floods, their prediction remains a hard exercise as the necessary data are often scarce. This study investigates the potential of hydrologic indices at different scales to improve understanding of flash floods dynamics and characterize catchment response in a model independent approach. These hydrologic indices gather information on hydrograph shape or catchment dynamic for instance and are useful to examine catchment signature in function of their size. Results show that for middle-size (>100 km²) catchments response shape can be correlated to storm cell position within the catchment contrarily to smaller catchments. In a multi-scale point of view, regional characteristics about catchment geomorphology or rainfall field statistics should provide useful insight to find pertinent hydrologic response indices. The combined use of these indices with a physically-based distributed modelling could facilitate calibration on ungauged catchments.

Item Type:Conference or Workshop Item (Speech)
Additional Information:IAHS Publ. 351, 2012, pp. 581-586.
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
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Deposited On:18 Sep 2013 09:41

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