Numerical Model for Sediment Transport and Bed Degradation in the Yangtze River Channel Downstream of Three Gorges Reservoir |
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Authors: | Gang Zhou Hong Wang Xuejun Shao Dongdong Jia |
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Affiliation: | 1Ph.D. Student, Dept. of Hydraulic Engineering, Tsinghua Univ., Beijing 100084, People’s Republic of China. E-mail: zhoug03@mails.tsinghua.edu.cn 2Associate Professor, Dept. of Hydraulic Engineering, Tsinghua Univ., Beijing 100084, People’s Republic of China (corresponding author). E-mail: hwang@tsinghua.edu.cn 3Professor, Dept. of Hydraulic Engineering, Tsinghua Univ., Beijing 100084, People’s Republic of China. E-mail: shaoxj@tsinghua.edu.cn 4Ph.D. Student, Dept. of Hydraulic Engineering, Tsinghua Univ., Beijing 100084, People’s Republic of China. E-mail: jdd05@mails.tsinghua.edu.cn
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Abstract: | This paper presents a two-dimensional morphological model for unsteady flow and both suspended-load and bed-load transport of multiple grain size to simulate transport of graded sediments downstream from the Three Gorges Reservoir. The model system includes a hydrodynamic module and a sediment module. The hydrodynamic module is based on the depth-averaged shallow water equations in orthogonal curvilinear coordinates. The sediment module describing nonuniform sediment transport is developed to include nonequilibrium transport processes, bed deformation, and bed material sorting. The model was calibrated using field observations through application to a 63-km-long alluvial river channel on the middle Yangtze River in China. A total of 16 size groups and a loose layer method of three sublayers were considered for the transport of the nonuniform bed materials in a long-term simulation. Predictions are compared with preliminary results of field observations and factors affecting the reliability of the simulated results are discussed. The results may be helpful to the development of more accurate simulation models in the future. |
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Keywords: | River bank erosion Sediment transport Waterways River beds Reservoirs China Numerical models |
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