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

journal contribution
posted on 21.12.2012, 09:13 authored by Ponnambalam Rameshwaran, Koji Shiono
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.

History

School

  • Architecture, Building and Civil Engineering

Citation

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

Publisher

© Taylor & Francis Ltd.

Version

VoR (Version of Record)

Publication date

2007

Notes

Closed Access. This article was published in the Journal of Hydraulic Research [© Taylor & Francis Ltd.] and the defintive version is available at: http://dx.doi.org/10.1080/00221686.2007.9521765

ISSN

0022-1686

Language

en