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Quasi two-dimensional model for straight overbank flows through emergent vegetation on floodplains

Rameshwaran, P.; Shiono, K.. 2007 Quasi two-dimensional model for straight overbank flows through emergent vegetation on floodplains. Journal of Hydraulic Research, 45 (3). 302-315.

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Abstract/Summary

The paper presents a quasi two-dimensional (2D) model calculating depth-averaged velocity and bed shear stress in a straight compound channel with a vegetated floodplain. The model numerically solves the depth-averaged Navier–Stokes equation for the streamwise motion of flow (quasi 2D). Reduction in volume of water due to vegetation is modelled as porosity. Drag force due to vegetation is modelled as an additional momentum sink term in the Navier–Stokes equation. Estimation methods for model parameters—drag coefficient, shading factor, porosity, friction factor, eddy viscosity and advection term—are discussed. The predictive capability of the model is assessed against experimental data with regard to distributions of depth-averaged velocity, bed shear stress, transverse shear stress and stage-discharge. The results show that the quasi 2D model reproduces a reasonable simulation of the flow field.

Item Type: Publication - Article
Programmes: CEH Programmes pre-2009 publications > Water
CEH Sections: Acreman
ISSN: 0022-1686
Additional Keywords: Quasi two-dimensional model, overbank flow, emergent vegetation, compound channel, floodplain, drag force
NORA Subject Terms: Hydrology
Date made live: 29 Oct 2007 15:01
URI: http://nora.nerc.ac.uk/id/eprint/1145

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