Modelling Flash Floods in a Karstic Watershed Using an Original Semi-distributed Radar-Gauge Merging Method

Raynaud, Felix; Borrell-Estupina, Valérie; Dezetter, Alain; Pistre, Séverin; Mathieu-Subias, Helene; Servat, Éric

doi:10.1007/978-3-319-09054-2_34

Cited by 1 publication

(1 citation statement)

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“…For this reason, Le Lay and Saulnier (2007), Cosandey and Robinson (2000), and Tramblay et al (2010) show that flashflood generation is controlled by spatial and temporal variability of rainfall and initial soil-moisture conditions. Moreover, sensitivity to rainfall heterogeneity is elevated in small watersheds, which are locations of flash flooding (Krajewski et al, 1991;Corradini and Singh, 1985;Raynaud et Published by Copernicus Publications on behalf of the European Geosciences Union.…”

Section: Introductionmentioning

confidence: 99%

Identification of spatial and temporal contributions of rainfalls to flash floods using neural network modelling: case study on the Lez Basin (Southern France)

Darras¹,

Estupina²,

Kong-A-Siou³

et al. 2015

Preprint

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Abstract. Flash floods pose significant hazards in urbanised zones and have important human and financial implications in both the present and future due to the likelihood that global climate change will exacerbate their consequences. It is thus of crucial importance to better model these phenomena especially when they occur in heterogeneous and karst basins where they are difficult to describe physically. Toward this goal, this paper applies a recent methodology (KnoX methodology) dedicated to extracting knowledge from a neural network model to better determine the contributions and time responses of several well-identified geographic zones of an aquifer. To assess the interest of this methodology, a case study was conducted in Southern France: the Lez hydrosystem whose river crosses the conurbation of Montpellier (400 000 inhabitants). Rainfall contributions and time transfers were estimated and analysed in four geologically-delimited zones to estimate the sensitivity of flash floods to water coming from the surface or karst. The Causse de Viol-le-Fort is shown to be the main contributor to flash floods and the delay between surface and underground flooding is estimated to be three hours. This study will thus help operational flood warning services to better characterise critical rainfall and develop measurements to design efficient flood forecasting models. This generic method can be applied to any basin with sufficient rainfall–runoff measurements.

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