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Cartographie hydrogéomorphologique : crues récentes sur les bassins versants de l'Aude, la Berre (1999) et le Gard (2002) en France

Abstract : On November 12 th and 13 th , 1999, and September 8 th and 9 th , 2002 two uncommon hydrometeorological events occurred in the Mediterranean part of France (400 mm and more in 24 hours), generating extensive damages (2 billions euros) and loss of human beings (58 dead). These events are a rare opportunity for comparing the flooding areas mapping with those of the hydrogeomorphological boundaries. Indeed the hydrogeomorphological approach is rising up in the engineering field relative to the natural hazards forecast. If we superpose the boundaries, on one hand, we can measure the linear of the overflowed and not overflowed alluvial plain by the expansion of the floodwaters and on the other hand, we can proceed to a research on the origins and the process that lead to an overflow. Thanks to graphical and numerical processing, the results obtained show a wide spreading of the floods within the alluvial plains of the twenty-seven rivers studied. Besides, the absence of incoherent cases with the principles of the hydrogeomorphological mapping has been shown. So, this study demonstrates the efficiency and the essential use of this naturalist approach.
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  • HAL Id : hal-01571394, version 1

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Christophe Esposito, Sylvain Chave, Jean-Louis Ballais, Virginie Delorme. Cartographie hydrogéomorphologique : crues récentes sur les bassins versants de l'Aude, la Berre (1999) et le Gard (2002) en France. Hors du lit : aléas, risques et mémoires, Sep 2010, Liessies, France. pp.47-60. ⟨hal-01571394⟩

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