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Cartographies préventives du risque lié aux " crues rapides " dans le nord de la France

Abstract : This article aims to better assess the risk due to flash floods occurring at the end of the spring or during summer in the north of the Parisian Basin. Most of the hydrological studies focused in this area on classical floods as overflowing and water table rising but not on floods rarely occurring in dry valleys. Based on sensitive and relevant parameters observed at two various scales, such approach might address to the stakeholders and to the risk managements a few preventive maps. The mapping firstly defines the flash floods risk at a regional scale comparing urban densities and the spatial distribution of sensitive watersheds to hazard. The latter are identified according to morphological characteristics. This exploratory approach permits us to detect high degree of risk in several bottom valleys due to the strong land lobby. Another mapping is secondly defined at local scales. Influence of the structural efficiency of a catchment is combined with the distribution of houses within the studied watershed. Our knowledge on exposed areas and those of local expert advices validate results. So, this approach gives satisfying results and should be used to anticipate exposed urban areas.
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Submitted on : Thursday, September 1, 2011 - 4:49:24 PM
Last modification on : Friday, October 23, 2020 - 4:58:35 PM
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  • HAL Id : halshs-00614880, version 1

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Johnny Douvinet, Daniel Delahaye, Patrice Langlois. Cartographies préventives du risque lié aux " crues rapides " dans le nord de la France. Nouvelles rencontres de ThéoQuant, Mar 2009, Besançon, France. pp.1-14. ⟨halshs-00614880⟩

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