金沙江下游梯级水库设计洪水复核计算
Recheck of Design Floods for Cascade Reservoirs in Downstream Jinsha River

金沙江下游建有乌东德~白鹤滩~溪洛渡~向家坝梯级水库，各水库初设坝址设计洪水成果采用的水文系列资料分别止于2008年、2009年、1998年和1998年。为考虑初设之后水文资料对设计成果的影响，采用华弹站、屏山站实测日径流资料及上游水库群实际运行资料，根据马斯京根法将两站序列还原并延长至2020年，进行梯级水库设计洪水复核计算。复核结果表明：1) 华弹站和屏山站设计洪水峰量的均值稍有增减(均变化0.6%左右)、Cv和Cs稍有减小，两者之比即Cs/Cv不变；2) 与原设计成果相比，乌东德、白鹤滩、溪洛渡和向家坝不同频率设计洪水的变幅基本控制在5%、3%、3%和3%以内；3) 设计洪水复核结果与初设误差基本控制在5%以内，且频率曲线也基本与原审定结果相符，可继续沿用初设成果。
There are Wudongde~Baihetan~Xiluodu~Xiangjiaba cascade reservoirs in the downstream Jinsha River, and the hydrological series data used for the design flood results of each reservoir site in the preliminary design stage end at 2008, 2009, 1998, and 1998, respectively. To consider the influence of floods on the hydrological results in the years after the preliminary design, the actual measured daily runoff data of Huatan and Pingshan hydrological station and the actual operation information of the upstream reservoir group were used, and the series of the two stations were naturalized and extended to 2020 according to the Maskingen method for the design flood recheck calculation of the cascade reservoirs. The results show that: 1) the mean values of the design flood peaks at the Huatan and Pingshan stations change slightly (both by 0.6%). Cv and Cs decrease slightly, while Cs/Cv remain unchanged; 2) the variations of the design floods of Wudongde, Baihetan, Xiluodu and Xiangjiaba with different frequencies are mainly within 5%, 3%, 3% and 3%; 3) the design floods of the cascade reservoirs in the downstream Jinsha River are within 5% of the original design error, and the flood frequency curves are basically consistent with the original audited results, which is recommended to follow.