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Indicators for flash flood prevention at the catchment scale using remote sensing data and simple field surveys


DESPRATS J-Francois

Overland flow and soil erosion models are necessary for the prevention and mitigation of numerous hazards such as the pollution of water bodies, the degradation of the soil system or the occurrence of muddy floods in urban areas. However, the processes leading to overland flow and soil erosion are complex and involved numerous parameters that interact non-linearly in time and space and that show both high spatial heterogeneities and temporal fluctuations. Parameter description therefore needs to be spatially distributed and carried out at regular intervals in time. Such constrains imply time consuming field campaigns and restrict model use to small monitored areas. Satellite data are spatially distributed over large areas and represent interesting potential alternative inputs in such model. The final objective of this study is to elaborate indicators for flash flood prevention on ungauged catchments.