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You are here : eLibrary : IAHR World Congress Proceedings : 32nd Congress - Venice (2007) : THEME A: Engineering and Management of Fresh-water Systems : Modeling of sediment deposition in a partly vegetated open channel
Modeling of sediment deposition in a partly vegetated open channel
Author : Peggy Zinke, Nils Reidar B. Olsen
A CFD model was tested against an experimental data set to examine the influence of emergent vegetation on sediment transport. The model solved the Reynolds-averaged NavierStokes equationsfor the water flow and the convection-diffusion equation for suspended sediments. A 3D grid was used together with the finite-volume-method and the k-ε-model for the turbulence. The numerical model was set up in similarity to published laboratory flume experiments with a partly vegetated open channel where the vegetation stems in the laboratory were represented by rigid cylindrical rods in a staggered arrangement. In the numerical model the drag force on the vegetation was included as a sink term in the Navier-Stokes equations. The change of turbulence characteristics due to vegetation was also taken into account, testing dragrelated source terms in the k- and ε-equations. The impact of re-suspension of sediments in the clear channel section was found to be as important as the use of the source terms for turbulence. With both processes included, a reasonable agreement between computation results and measurement data could be obtained. However, there are uncertainties caused by the interaction processes between open channel and vegetated flow zone.
File Size : 226,032 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 32nd Congress - Venice (2007)
Article : THEME A: Engineering and Management of Fresh-water Systems
Date Published : 01/07/2007
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