Karst flash-flood forecasting in the city of Nîmes southern FranceReport as inadecuate




Karst flash-flood forecasting in the city of Nîmes southern France - Download this document for free, or read online. Document in PDF available to download.

* Corresponding author 1 BRGM - Bureau de Recherches Géologiques et Minières

Abstract : In southern France, karst flash-floods may be the result of two, potentially cumulative, phenomena: - Floods from highly localized events that mostly occur during autumn and are locally known as Cevenol rain events ; - Floods exacerbated by recent rainfall events that contributed to saturation of the aquifer before the storm event, thereby increasing runoff. In any case, flash floods occurring in a karst landscape are directly linked to the structure and hydraulic properties of the karst aquifer. A methodology was developed for the city of Nîmes for forecasting these dangerous events, based on the study and modelling of karst-aquifer response to rain events. This work was composed of: i Definition of how the Nîmes system functions, leading to a conceptual model; ii Modelling of this conceptual model; iii Definition of a tool for hazard management, presented as an abacus and tested on particular strong rainfall event.

keyword : Management Karst aquifer Flash-flood Modelling Management.





Author: Perrine Fleury - Jean-Christophe Maréchal - Bernard Ladouche -

Source: https://hal.archives-ouvertes.fr/



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