Study On Vertical Cross Section 2-D Numerical Model Of Flow And Sediment On Dam Area

A correct knowledge about the flow and sediment distribution in front of the dam has to be got before the water inlet of flood discharge, sediment ejection, generate electricity and water supply in the reservoir hinge are established and run. If there is little knowledge about the rule of water and sediment movement, it may reduce the reservoir's capacity of controlling flood, irrigation, generating electricity and shipping, what's more, it threaten lives and property of people security. Especially in sediment-laden stream siltation develops rapidly and the riverbed changes acutely, so the rule of flow velocity and sediment distribution become more complex. The harm is serious. It is very urgent to solve the problem that how to lay the water inlet and how to regulate sediment and water to cut down the disadvantage influence. The research on the rule of flow and sediment in front of the dam is helpful for the reservoir design and operation. A split vertical 2-D water and sediment mathematical model and 1-D density current mathematical model were set up to get the primary knowledge about water and sediment movement.This paper includes 6 chapters. The details are as follows.Chapter 1 summarizes the history and the developing future of split vertical 2-D stream load mathematical model. And the development direction of numerical model is analyzed.Chapter 2 sets up a split vertical 2-D stream load mathematical model. The model import previous research and bring forward the boundary conditions. The N-S equation is closed. As is followed that the chapter introduced the FVM method and uses the method to disperse the equations and solve the equations. On the other hand, the chapter put forward a way on the problems of dynamic water pressure, moving boundary, silt carry capacity, resume saturation coefficient.Chapter 3 has a test about the split vertical stream load model. The test result includes the vertical velocity of flow and vertical sediment concentration of sections. Then the model is used to analysis the sediment flushing sluice. The simulation result indicates that the lower the flushing sluice is, the capacity of sediment flushing sluice larger. The result also presents the charts of vertical velocity of flow and sediment distribution within 200m from the former dam. The rule of the flow and sediment distribution is clear and glance.Chapter 4 has set up a 1-D density current simulation model. It is especially used to simulate the case that density current appears in the reservoir. The simulation resultincludes boundary, concentration and velocity of density current. In the chapter the density current of sediment data of Xiao Lang Di reservoir in Huang He River is used to test the model. The result is very good. It is according with the fact well. The model can reflect the essence rule of density current movement. It is credibility.Chapter 5 summarizes the pre-process and the dynamic visualization technology of the model. The chapter introduces how to get the data from the relief map by computer, how to mesh the calculating region, and how to display the velocity field. It over come the shortage of simulation.Chapter 6 sums up the whole paper and prospects further research work in the future.