Abstract：The sedimentation of a hydropower station reservoir was simulated through a two-dimensional mathematical model. The simulated river reach starts from about 600 m upstream the dam and terminates at about 400 m downstream. The calculation sections are 20 large sections with an ave-rage interval of 500 m in the reservoir divided by using a 1:2 000 topographic map. Additionally, the feasibility of simulating changes of sedimentation in the reservoir by the mathematical model is validated through the model test. The results show that the reservoir sedimentation is in delta sedimentation pattern. When the reservoir is operated for 1 year, the delta head keeps moving downstream, and finally reaches front of the dam with an elevation as high as 1 347 m. While the sedimentation in the reservoir develops to the high beach at the tail of the reservoir and the ″tail up″ phenomenon is obvious. After the reservoir has been operated for 1 year, the sand discharge ratio is stable at more than 90%. After the reservoir reaches the balance of scouring and silting, the operation mode of ″storing clean and discharging muddy″ is adopted to wash the sand. A scouring funnel is formed in front of the bottom hole for flood discharge and sand flushing. The funnel has a three-dimensional shape. The gradient along the flow direction is about 1∶50-1∶70, and the side slope is about 1∶3.5-1∶4.5. The intake is basically within the scope of scouring funnel, which can keep the taken water ″clean in front of the gate″. The sedimentation based on the mathematical model is basically consistent with the model test results, and it is feasible to simulate the change of reservoir sedimentation.
洪振国. 水电站水库泥沙淤积的二维数学模型[J]. 排灌机械工程学报, 2020, 38(9): 910-914.
HONG Zhenguo. Two-dimensional mathematical model of sedimentation in hydropower station reservoirs. Journal of Drainage and Irrigation Machinery Engin, 2020, 38(9): 910-914.
