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Using a multi-hypothesis framework to improve the understanding of flow dynamics during flash floods

Douinot, Audrey and Roux, Hélène and Garambois, Pierre-André and Dartus, Denis Using a multi-hypothesis framework to improve the understanding of flow dynamics during flash floods. (2018) Hydrology and Earth System Sciences, 22 (10). 5317-5340. ISSN 1027-5606

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Official URL: https://doi.org/10.5194/hess-22-5317-2018

Abstract

A method of multiple working hypotheses was applied to a range of catchments in the Mediterranean area to analyse different types of possible flow dynamics in soils during flash flood events. The distributed, process-oriented model, MARINE, was used to test several representations of subsurface flows, including flows at depth in fractured bedrock and flows through preferential pathways in macropores. Results showed the contrasting performances of the submitted models, revealing different hydrological behaviours among the catchment set. The benchmark study offered a characterisation of the catchments’ reactivity through the description of the hydrograph formation. The quantification of the different flow processes (surface and intra-soil flows) was consistent with the scarce in situ observations, but it remains uncertain as a result of an equifinality issue. The spatial description of the simulated flows over the catchments, made available by the model, enabled the identification of counterbalancing effects between internal flow processes, including the compensation for the water transit time in the hillslopes and in the drainage network. New insights are finally proposed in the form of setting up strategic monitoring and calibration constraints.

Item Type:Article
Additional Information:This is an open access article under the CC BY-NC-ND license : https://creativecommons.org/licenses/by-nc-nd/4.0/. Thanks to Elsevier editor. The definitive version of this document is available at: https://www.hydrol-earth-syst-sci.net/22/5317/2018/
HAL Id:hal-02094160
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Ecole Nationale du Génie de l'Eau et de l'Environnement de Strasbourg - ENGEES (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Other partners > Institut National des Sciences Appliquées de Strasbourg - INSA (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: Helene ROUX
Deposited On:21 Feb 2019 14:18

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