Improved 1-D modelling in compound meandering channels with vegetated floodplains / Martin-Vide, J. P. in Journal of hydraulic research, Vol. 46 N°2 (2008)  

Public ISBD [article]  inJournal of hydraulic research > Vol. 46 N°2 (2008) . - p. 265-276 Titre : Improved 1-D modelling in compound meandering channels with vegetated floodplains Titre original : Modélisation unidimensionnelle améliorée des cours d'eau à méandres avec des plaines d'inondation couvertes de végétation Type de document : texte imprimé Auteurs : Martin-Vide, J. P., Auteur ; P. J. M. Moreta, Auteur ; S. Lopez-Querol, Auteur Article en page(s) : p. 265-276 Note générale : Hydraulique Résumé en Français Langues : Anglais (eng) Mots-clés : Compound channel Foodplain Meanders Vegetation 1D-modelling Résumé : This paper shows that common open channel flow one-dimensional (1-D) numerical models behave poorly in terms of flow distribution across a section in a naturalized meandering channel with vegetated floodplains. We compared numerical models with new experiments carried out in a physical model on a reach of the Besòs river close to Barcelona that has been restored. The case examined has floodplains with thick vegetation, a low-flow meandering channel and high water depths over the main channel and floodplains. 1-D models overestimate velocities in the main channel but underestimate them on the floodplains. The paper gives a detailed description of an improved 1-D computation method based on the consideration of the total shear stress at the main channel-floodplain interface (the sum of turbulent friction plus lateral momentum transfer) on the one hand, and the influence of upstream velocity distribution with the help of two-dimensional numerical models on the other hand. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.journalhydraulicresearch.com [article] Improved 1-D modelling in compound meandering channels with vegetated floodplains = Modélisation unidimensionnelle améliorée des cours d'eau à méandres avec des plaines d'inondation couvertes de végétation [texte imprimé] / Martin-Vide, J. P., Auteur ; P. J. M. Moreta, Auteur ; S. Lopez-Querol, Auteur . - p. 265-276. Hydraulique Résumé en Français Langues : Anglais (eng) in Journal of hydraulic research > Vol. 46 N°2 (2008) . - p. 265-276 Mots-clés : Compound channel Foodplain Meanders Vegetation 1D-modelling Résumé : This paper shows that common open channel flow one-dimensional (1-D) numerical models behave poorly in terms of flow distribution across a section in a naturalized meandering channel with vegetated floodplains. We compared numerical models with new experiments carried out in a physical model on a reach of the Besòs river close to Barcelona that has been restored. The case examined has floodplains with thick vegetation, a low-flow meandering channel and high water depths over the main channel and floodplains. 1-D models overestimate velocities in the main channel but underestimate them on the floodplains. The paper gives a detailed description of an improved 1-D computation method based on the consideration of the total shear stress at the main channel-floodplain interface (the sum of turbulent friction plus lateral momentum transfer) on the one hand, and the influence of upstream velocity distribution with the help of two-dimensional numerical models on the other hand. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.journalhydraulicresearch.com

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