岷江上游大型水电站运行对龙溪口下游航道枯水期水位和流量的影响

根据规划,岷江龙溪口—宜宾段将通过航道整治达到内河Ⅲ级航道标准.该河段多年历时保证率95％的流量仅能达到662 m3/s,但是岷江上游紫坪铺、瀑布沟等大型水电站的建成对下游河段通航流量产生了较大影响.根据紫坪铺水电站蓄水前、后高场水文站的径流、泥沙资料,分析紫坪铺等大型水电站建成后对下游河段水沙特性的影响,得知岷江上游...

Influence of operation of large hydropower station in the upper reaches of Minjiang River on water level and discharge in the lower Longxikou channel during dry season

According to the planning,the section from Longxikou to Yibin in Minjiang River will reach Grade III inland waterway standard through waterway regulation.According to the historical data,the 95%flow rate of the section over the years can only reach 662 m³/s.However,with the construction of large hydropower stations such as Zipingpu and Pubugou in the upper reaches of Minjiang River in recent years,the navigable flow of the reach has been greatly affected.Based on the runoff and sediment series of Gaochang hydrometric station before and after impoundment of Zipingpu Hydropower Station,we analyze the influence of Zipingpu and other large hydropower stations on the water and sediment characteristics of the river reach,and know that the amount of incoming sediment is obviously reduced,the annual distribution of runoff is homogenized,and the discharge is obviously increased in the dry season.Especially,when the multi-year guarantee rate is 95%,the discharge is increased by 166 m³/s and corresponding water level is increased by 0.21 m.The research results can provide flow support for the research reach to reach Grade Ⅲ inland waterway standard.