官厅水库妫水河口拦门沙疏浚的数值模拟研究

Numerical Simulation on Dredging Channel of Guishui River Mouth Bar of Guanting Reservoir

利用一、二维嵌套的不平衡输沙数学模型 ,对官厅水库妫水河口拦门沙疏浚挖槽方案进行了数值模拟 ,分析了影响挖泥槽回淤的各种因素 ,并通过对几种典型的挖槽方案进行计算分析 ,提出了合理的疏浚挖槽方案。

Several dredging plans have been conducted by the mathematical model.The simulated results show that the amount of silt in the dredged channel could be affected by the oncoming flow and sediment, the relative position between the channel and the mouth, and the operation water level of Guanting reservoir. To restore the water supply to Beijing city, it is suggested that the dredging plan of 15～50m wide dredge channel should be implemented in the current project. In the future, a 300m wide dredge channel should be applied. In the permission of cost, it would be better to take both measurements of dredging channel and training dike.