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Contexte pédoclimatique et ruissellement intense

Abstract : The Hydro-Eco-Regions (or HERs) respond to a request of the European Water Framework Directive. HERs are soil-climatic entities whose hypothesis we test here that they condition erosion and deposition processes linked to intense runoff. Confirmation of this hypothesis would make it possible to propose at the national level a pre-calibration of the runoff maps produced by the IRIP method. In this work carried out over 4 years, test zones from 8 HERs out of 21 in metropolitan France were tested. For this purpose, the IRIP maps of intense runoff potential were compared with various data sets considered to be representative of the consequences of intense runoff. The comparison method between HERs used an operational efficiency criterion: the potential levels were chosen to detect at least 80% of incidents over a maximum of 20% of the catchment area. The combinations of potential levels for transfer-erosion and flood-deposit hazards differ according to the HER. This first attempt at a regional pre-calibration of significant potential thresholds according to the HER makes sense. However, more field data should be available within the same HER to ensure internal homogeneity and differences between HERs.
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Contributor : Pascal Breil Connect in order to contact the contributor
Submitted on : Monday, April 12, 2021 - 5:03:52 PM
Last modification on : Tuesday, April 12, 2022 - 3:04:03 PM
Long-term archiving on: : Tuesday, July 13, 2021 - 7:09:39 PM


48 -Colloque SHF Ruissellement...
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  • HAL Id : hal-03196326, version 1



Pascal Breil, Hélène Abekhzer, Tristan Gally. Contexte pédoclimatique et ruissellement intense. e-Colloque "Risque ruissellement : diagnostic et solutions", Société Hydrotechnique de France, Nov 2020, En ligne, France. ⟨hal-03196326⟩



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