Author(s): Sung-Uk Choi; Hyedeuk Bae
Linked Author(s): Sung-Uk Choi
Keywords: Compound channel; Floodplain; Morphological process; Sediment transport; Vegetation
Abstract: 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.
Year: 2011