STUDY ON TWO DIMENSIONAL SEDIMENT MATHEMATICAL MODEL OF PLANE IN THE LOWER YELLOW RIVER

摘要

Based on the fitting method of boundary coordinate, the solution by dispersion for flow continuity equation and flow motion equation is worked out with ADI method on alternative grids. The solution by dispersion for sediment continuity equation is worked out with the method on control volume. The basic frame of model is set up by the newest research results of sediment continuity equation, bed deformation equation, capacity of sediment-laden flow and bed roughness etc introduced. This model is verified by 1982's flood. It is shown from the results that the process of peak propagation, the process of water level variation and the process of sediment concentration calculated by the model tally with measured results well. The velocity field, flooded depth and range, and sediment concentration field etc are identical with the fact.