2020年三峡水库沙峰排沙调度分析

Analysis of sediment peak discharge regulation of TGP Reservoir in 2020

为了减少三峡水库库区泥沙淤积,提高水库排沙效率,2020年8月中旬长江4、5号洪水期间,在泥沙实时监测和精确预报的基础上,三峡水库进行了沙峰排沙调度。调度期间,三峡水库坝前最高调洪水位虽然高达167.65 m,但此次沙峰过程排沙比仍达到了27%,比试验性蓄水以来平均排沙比高9%,沙峰排沙调度取得良好效果。对2020年长江4、5号洪水期间上游暴雨产沙特性、三峡水库入库泥沙组成和增多原因、沙峰排沙调度等进行了分析总结,为今后长江上游来水来沙研究以及三峡水库更好地进行科学调度提供了技术支持。

To mitigate the sediment deposition in TGP Reservoir and improve sediment discharge ratio,on the basis of real-time sediment monitoring and precise forecast,the sediment peak discharge regulation of TGP reservoir was conducted in mid-August 2020 during No.4 and No.5 floods of Yangtze River.During the operation period,the highest flood regulation level in front of the TGP reservoir is 167.65 m,while the sediment discharge ratio during the peak process still reached 27%,which was 9%higher than the average sediment discharge ratio since the trial impoundment.The sediment peak discharge regulation has achieved satisfying results.The characteristics of storm sediment yield in the upper reaches of Yangtze River during No.4 and No.5 floods of Yangtze River in 2020,the composition of the sediment entering into Three Gorges Reservoir and the causes for the sediment increase,and the regulation of sediment peak discharge are analyzed and summarized,so as to provide support for the study of the incoming flow and sediment in the upper reaches of Yangtze River and the scientific operation of Three Gorges Reservoir in the future.