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Article Dans Une Revue Hydrology and Earth System Sciences Année : 2018

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

Résumé

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.
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Dates et versions

hal-02094160 , version 1 (09-04-2019)

Identifiants

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Audrey Douinot, Hélène Roux, Pierre-André Garambois, Denis Dartus. Using a multi-hypothesis framework to improve the understanding of flow dynamics during flash floods. Hydrology and Earth System Sciences, 2018, 22 (10), pp.5317-5340. ⟨10.5194/hess-22-5317-2018⟩. ⟨hal-02094160⟩
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