Comptes Rendus
1D–2D coupling for river flow modeling
Comptes Rendus. Mécanique, Volume 339 (2011) no. 4, pp. 226-234.

A shallow water-based model for river–floodplain interaction (SW12D for Shallow Water 1D–2D) is presented. The main channel and floodplain are discretized using 1D and 2D elements respectively. The proposed model provides an improved description of hydraulic phenomena over existing models by (i) including lateral momentum transfer between the main channel and the floodplain, (ii) taking the 2D nature of the flow into account within the 1D elements that describe the main channel. This allows for a better description of phenomena such as head losses due to channel bends and meanders, and meander shortcuts during floods.

Un modèle basé sur les équations de Saint-Venant en eau peu profonde (SW12D pour Shallow Water 1D–2D) est présenté. Le lit mineur et le lit majeur sont discrétisés avec des mailles 1D et 2D respectivement. Le modèle proposé apporte une meilleure description (en comparaison aux modèles existants) des phénomènes hydrauliques en (i) incluant un transfert de quantité de mouvement latérale entre les lits mineur et majeur, (ii) prenant en compte la nature 2D des écoulements dans les mailles 1D qui représentent le lit mineur. Cela permet une meilleure description des phénomènes tels que les pertes de charge dues aux coudes et méandres et tels que les court-circuits de meandres pendant les inondations.

Received:
Accepted:
Published online:
DOI: 10.1016/j.crme.2011.02.001
Keywords: Computational fluid mechanics, 1D–2D coupling model, Hydrodynamic modeling, Saint-Venant equations, Main channel/floodplain interactions
Mot clés : Mécanique des fluides numérique, Couplage 1D–2D, Modélisation hydrodynamique, Équations de Saint-Venant, Intéractions lit mineur / lit majeur

Pascal Finaud-Guyot 1; Carole Delenne 2; Vincent Guinot 2; Cécile Llovel 3

1 Institut de mécanique des fluides et des solides de Strasbourg (CNRS, ENGEES, INSA, UDS), 2, rue Boussingault, 67000 Strasbourg, France
2 HydroSciences Montpellier, UMR 5569 (CNRS, IRD, UM1, UM2), université Montpellier 2, place Eugène-Bataillon, CCMSE, 34095 Montpellier, France
3 GEI (Ginger Environnement et Infrastructures), 34060 Montpellier cedex 2, France
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     title = {1D{\textendash}2D coupling for river flow modeling},
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Pascal Finaud-Guyot; Carole Delenne; Vincent Guinot; Cécile Llovel. 1D–2D coupling for river flow modeling. Comptes Rendus. Mécanique, Volume 339 (2011) no. 4, pp. 226-234. doi : 10.1016/j.crme.2011.02.001. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2011.02.001/

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