1D+ model for overbank flows with a transition bed friction - emergent rigid vegetation drag - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Access content directly
Conference Papers Year : 2016

1D+ model for overbank flows with a transition bed friction - emergent rigid vegetation drag

Modèle 1D+ pour des écoulements débordants avec transition rugosité de fond - force de traînée causée par de la végétation rigide émergente

Sébastien Proust
V. Dupuis
  • Function : Author
Céline Berni
André Paquier

Abstract

This paper investigates the 1-D+ modelling of overbank flows in case where Floodplains (FP) feature a streamwise roughness transition from bed-roughness to emergent rigid vegetation, or vice versa (representing e.g. a change from highly submerged dense meadows to emergent trees areas). The simulations are compared with experimental data collected in a compound channel flume. The meadow is physically modelled by artificial plastic grass and the trees by rigid stems. The upstream discharge distribution between the Main Channel (MC) and the FP is varied in order to alter the lateral mean flow between MC and FP. To account for the upstream discharge distribution, the 1D+ model developed by Proust et al. (2009), the Independent Sub-sections Method (ISM), is used. The volume drag force exerted by the stems is modelled by a formula established by Nepf (1999). The ability of ISM to predict flow depth, mean flow in the FP, and the depth-averaged Reynolds-stress at the junction MC/FP is assessed.
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Dates and versions

hal-01373346 , version 1 (28-09-2016)

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Sébastien Proust, J.B. Faure, V. Dupuis, Céline Berni, André Paquier. 1D+ model for overbank flows with a transition bed friction - emergent rigid vegetation drag. 8th International Conference on Fluvial Hydraulics (River Flow 2016), Jul 2016, Saint Louis, MO, United States. pp.2255-2261. ⟨hal-01373346⟩

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