Anneli Lenica

Institut de Mécanique des Fluides de Toulouse

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Laurie Boithias

Université Toulouse III - Paul Sabatier

Kévin Larnier

CS Communication & Systèmes (France)

Sabine Sauvage

Laboratoire Écologie Fonctionnelle et Environnement

J.M. Sánchez-Pérez

Centre National de la Recherche Scientifique

Denis Dartus

Institut de Mécanique des Fluides de Toulouse

Hélène Roux

Centre National de la Recherche Scientifique

Karim C. Abbaspour

Institute of Urban Environment

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Université Toulouse III - Paul Sabatier

Université de Toulouse

Centre National de la Recherche Scientifique

Institut National Polytechnique de Toulouse

Institut de Recherche pour le Développement

Laboratoire Écologie Fonctionnelle et Environnement

Centre de Recherche sur la Biodiversité et l'Environnement

École Nationale Supérieure Agronomique de Toulouse

Utrecht University

Sidi Mohamed Ben Abdellah University

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Simulating Flash Floods at Hourly Time-Step Using the SWAT Model

Water (2017)

Laurie Boithias Sabine Sauvage Anneli Lenica Hélène Roux Karim C. Abbaspour

Flash floods are natural phenomena with environmental, social and economic impacts. To date, few numerical models are able to simulate hydrological processes at catchment scale at a reasonable time scale to describe flash events with accurate details. Considering a ~810 km2 Mediterranean river coastal basin (southwestern France) as a study case, the objective of the present study was to assess the ability of the sub-daily module of the lumped Soil and Water Assessment Tool (SWAT) to simulate discharge (1) time-continuously, by testing two sub-basin delineation schemes, two catchment sizes, and two output time-steps; and (2) at flood time-scale, by comparing the performances of SWAT to the performances of the event-based fully distributed MARINE model when simulating flash flood events. We showed that there was no benefit of decreasing the size of the minimum drainage area (e.g., from ~15 km2 down to ~1 km2) when delineating sub-basins in SWAT. We also showed that both the MARINE and SWAT models were equally able to reproduce peak discharge, flood timing and volume, and that they were both limited by rainfall and soil data. Hence, the SWAT model appears to be a reliable modelling tool to predict discharge over long periods of time in large flash-flood-prone basins.

Flash flood

SWAT model

Hydrological modelling

10.3390/w9120929

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Citations (90)