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You are here : eLibrary : IAHR World Congress Proceedings : 34th Congress - Brisbane (2011) : THEME 5: Environmental Hydraulics and Hydrology : Impact of floodplain vegetation on morphological process in the straight compound open-channel: a nu...
Impact of floodplain vegetation on morphological process in the straight compound open-channel: a numerical study
Author : Sung-Uk Choi and Hyedeuk Bae
The present paper introduces a numerical model that is capable of simulating the morphological change of a straight open-channel. The computational procedures take three steps, namely flow prediction, estimation of bedload, and building the new channel shape in response to the bedload transport. The one-dimensional depth-averaged equation, called the lateral distribution method, with vegetation drag term is used for flow prediction, and the vectorized formula proposed by Kovacs and Parker (1994) is used to estimate bedload. The Exner’s equation is solved to predict the channel shape with the help of the sliding algorithm proposed by Menendez et al. (2008). First, the flow model is applied to a compound channel without vegetation on the floodplain. Then, nondimensional eddy viscosity is calibrated for vegetated flows. Finally, the model is applied to a hypothetical compound channel with floodplain vegetation. The impacts of vegetation on the flow and morphological process are investigated and discussed.
File Size : 272,027 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 34th Congress - Brisbane (2011)
Article : THEME 5: Environmental Hydraulics and Hydrology
Date Published : 01/07/2011
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