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2D numerical modeling of grain-sorting processes and grain size distributions |
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| Affiliation: | 1. National Inland Waterway Regulation Engineering Research Center, Chongqing Jiaotong University, 400074 Chongqing, China;2. State Key Laboratory of Hydroscience and Engineering, Department of Hydraulic Engineering, Tsinghua University, 100084 Beijing, China |
| Abstract: | A depth-averaged finite difference two-dimensional hydrodynamic-morphological and sediment transport model is presented in the orthogonal curvilinear grid system. The sediment submodel considers the influence of selective sorting by modifying the sediment transport capacity and incorporates a simple simulation method to describe changes in the grain size distribution of the bed surface by solving the governing equation for sediment mass conservation. The 2D numerical model was applied to the experiment on downstream fining. The model simulation results and the measurements are in acceptable agreement. The result illustrates the capability of the two-dimensional model to predict the sediment wedge evolution and grain sorting process. |
| Keywords: | Channel morphology Selective sorting Bed surface grain size distribution 2D numerical model |
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