小浪底水库2018年主汛期防洪预泄排沙效果分析

Analysis on the Effect of Sediment Flushing and Pre-Discharge for Flood Control of Xiaolangdi Reservoir During the Main Flood Season in 2018

对小浪底水库在2018年7月3—11日主汛期防洪预泄的排沙效果进行了分析,该预泄过程最大流量为4490 m3/s,最大含沙量为154 kg/m3,出库水量为20.03亿m3,出库沙量为1.274亿t,平均含沙量为63.6 kg/m3,取得了良好的排沙效果。分析表明:在小浪底水库合理调度运用的前提下,降低水库水位能显著提高排沙效果,当排沙期间的平均库水位降至225 m以下时,排沙效果明显提高。建议在今后工作中加强相关研究,合理调度上中游洪水冲刷下游河道。

The effect of sediment flushing and pre discharge for flood control of Xiaolangdi Reservoir during the main flood season from July 3 to 11, 2018 was analyzed. The maximum flow of the pre discharge process was 4 490 m3 / s, the maximum sediment concentration was 154kg/m3,the outflow water amount of reservoir was 2.003billion cubicmeters,the outflow sediment amount of reservoir was 127.4million tons,and the average sediment concentration was 63.6kg/m3,which achieveda good result of sediment flushing.The analysis show sthatun der the premise of reasonable scheduling and operation of Xiaolangdi Reservoir, lowering the water level of the reservoir can improve the effect of sediment flushing significantly, and when the average water level of the reservoir falls below 225 m during the period of sediment flushing, the sediment flushing effect is improved significantly. It is suggested that the relevant research should be strengthened in the future work and floods in the upper and middle reaches that scour the lower reaches of the river should be properly dispatched.