黄河小浪底水库防洪减淤作用与效益跟踪分析.

Xiaolangdi Reservoir has played a great role in flood control, sediment reduction and profit improvement. This paper systematically analyzed the flood control operation and the function of the Xiaolangdi Reservoir. By analyzing the sediment erosion and sedimentation of the reservoir and the Lower Yellow River, the effect of sediment reduction of the reservoir was proposed. The benefit of flood control and sediment reduction of the reservoir was calculated. The results show that the reservoirs in the middle reaches of the Yellow River can block the flood and cut the peak for 15 times. The average peak cutting rate of Huayuankou Station is 36%, and the maximum peak cutting flow is 7 560 m³/s, which can effectively avoid the flood losses in the downstream beach area. Due to the decrease of sediment load, the sedimentation rate of the reservoir is lower than that in the design stage, and the sediment retention ratio of 1.26 relative to the downstream channel is lower than that of 1.57 in the design sediment retention stage. The sediment reduction effect of the reservoir is better, especially in the reach below the Aishan. According to the 2020 price level, the actual annual benefits of flood control (ice-run prevention) and sediment reduction of the reservoir are 5.927 billion Yuan more than the design value, and the cumulative present value of benefits is 21.873 billion Yuan more than the total investment (including power generation), indicating the economic rationality of the construction of the Yellow River water and sediment regulation backbone project, which provides a successful example for accelerating the construction of Guxian project [ABSTRACT FROM AUTHOR]