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

Boithias, Laurie and Simeoni-Sauvage, Sabine and Lenica, Anneli and Roux, Hélène and Abbaspour, Karim C. and Larnier, Kévin and Dartus, Denis and Sanchez-Pérez, José-Miguel Simulating Flash Floods at Hourly Time-Step Using the SWAT Model. (2017) Water, 9 (12). 1-25. ISSN 2073-4441

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Official URL: http://www.documentation.ird.fr/hor/fdi:010071983

Abstract

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 andWater 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.

Item Type:Article
Additional Information:Thanks to MDPI editor.The original PDF of the article can be found at IRD website : http://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers18-01/010071983.pdf
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
French research institutions > Institut National de la Recherche Agronomique - INRA (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Swiss Federal Institute of Aquatic Science and Technology - EAWAG (SWITZERLAND)
Laboratory name:
Funders:
RTRA STAE - EC2CO
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Deposited By: Helene ROUX
Deposited On:23 Feb 2018 09:42

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