A vortex-based model of velocity and shear stress in a partially vegetated shallow channel

dc.contributor.author White, Brian L.
dc.contributor.author Nepf, Heidi M.
dc.date.accessioned 2010-05-18T18:56:27Z
dc.date.available 2010-05-18T18:56:27Z
dc.date.issued 2008-01-08
dc.description Author Posting. © American Geophysical Union, 2008. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Water Resources Research 44 (2008): W01412, doi:10.1029/2006WR005651. en_US
dc.description.abstract This paper presents a method for predicting the distributions of velocity and shear stress in shallow channels with a boundary of emergent vegetation. Experiments in a laboratory channel with model vegetation show that the velocity profile exhibits a distinct two-layer structure, consisting of a rapidly varying shear layer across the vegetation interface and a more gradual boundary layer in the main channel. In addition, coherent vortices are observed which span both layers, and are the dominant contributors to lateral momentum fluxes. From these observations, we propose a model for the vortex-induced exchange and find expressions for the width of momentum penetration into the vegetation, the velocity and shear stress at the vegetation edge, and the width of the boundary layer in the main channel. These variables, along with a momentum balance in the main channel, comprise a modeling framework which accurately reproduces the observed velocity and shear stress distributions. The predictions for the velocity and shear stress can provide a basis for modeling flood conveyance, overbank sediment transport, and scalar residence time in the vegetated layer. en_US
dc.description.sponsorship This material is based upon work supported by the National Science Foundation under grant 0125056. en_US
dc.format.mimetype application/pdf
dc.identifier.citation Water Resources Research 44 (2008): W01412 en_US
dc.identifier.doi 10.1029/2006WR005651
dc.identifier.uri https://hdl.handle.net/1912/3473
dc.language.iso en_US en_US
dc.publisher American Geophysical Union en_US
dc.relation.uri https://doi.org/10.1029/2006WR005651
dc.subject Vegetated channel en_US
dc.subject Shallow shear layer en_US
dc.subject Coherent structures en_US
dc.title A vortex-based model of velocity and shear stress in a partially vegetated shallow channel en_US
dc.type Article en_US
dspace.entity.type Publication
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relation.isAuthorOfPublication c97a0e86-047d-4b74-9ad7-c6a4af785b7d
relation.isAuthorOfPublication.latestForDiscovery 69aafe43-d163-4c52-8b64-ee2cac767f2d
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