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Velocity profiles in a real vegetated channel

Cassan, Ludovic and Belaud, Gilles and Baume, Jean Pierre and Dejean, Cyril and Moulin, Frédéric Y. Velocity profiles in a real vegetated channel. (2015) Environmental Fluid Mechanics, 15 (6). 1263-1279. ISSN 1567-7419

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Official URL: https://doi.org/10.1007/s10652-015-9417-0

Abstract

Most of the studies regarding vegetation effects on velocity profiles are based on laboratory experiments. The main focus of this paper is to show how the laboratory knowledge established for submerged vegetation applies to real-scale systems affected by vegetation growth (mainly Ranunculus fluitans). To do so, experiments are conducted at two gage stations of an operational irrigation system. The analysis of first- and second-order fluctuations of velocities is based on field measurements performed by micro-acoustic doppler velocimeter during 8 months, completed with flow measurement campaigns in different seasons. The Reynolds stresses are used to determine shear velocities and deflected plant heights. Then, the modified log–wake law (MLWL), initially derived from laboratory flume experiments, is applied with a unique parametrisation for the whole set of velocity profiles. The MLWL, along with a lateral distribution function, is used to calculate the discharge and to show the influence of vegetation height on the stage–discharge relationships.

Item Type:Article
HAL Id:hal-02094295
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > AgroParisTech (FRANCE)
French research institutions > Centre de Coopération Internationale en Recherche Agronomique - CIRAD (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
French research institutions > Institut national de Recherche en Sciences et Technologies pour l'Environnement et l'Agriculture - IRSTEA (FRANCE)
French research institutions > Institut de Recherche pour le Développement - IRD (FRANCE)
Other partners > Montpellier SupAgro (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Laboratory name:
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Deposited By: Frederic MOULIN
Deposited On:27 Mar 2019 08:30

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