向家坝坝下水位顶托关系研究  

Research on Relationship Between Water Level and Backwater Jacking of Xiangjiaba Dam

作　　者：王飞龙 胡挺 时玉龙 WANG Fei-long;HU Ting;SHI Yu-long(China Three Gorges Corporation,Yichang 443100,China)

机构地区：[1]中国长江三峡集团有限公司,湖北宜昌443100

出　　处：《水电能源科学》2024年第12期200-203,208,共5页Water Resources and Power

基　　金：国家重点研发计划(2021YFC3200302);中国长江三峡集团有限公司科研项目(0799238);国家自然科学基金项目(U2340205)。

摘　　要：岷江、横江来水对长江干流水位具有明显的顶托作用,影响汇合口上游的向家坝水库调度决策。为系统分析下游来水对向家坝坝下水位顶托影响,利用2016~2023年资料,采用控制变量原理建立了横江流量与向家坝坝下水位顶托关系,在此基础上分析了2020年岷江洪水对向家坝坝下水位的顶托影响,采用落差指数法进一步建立了干流宜宾水位与向家坝坝下水位、流量三相关系。结果表明,岷江来水和向家坝出库流量的比值与向家坝坝下至宜宾站水位落差呈指数关系;横江流量为300~2000 m^(3)/s时,顶托量为0.28~0.85 m;2020年岷江洪水对向家坝坝下水位最大顶托5.92 m,当宜宾站水位高于271 m时,向家坝坝下水位将会受到不同程度的顶托影响。The inflow of Minjiang River and Hengjiang River has obvious jacking effect on the water level of the main stream of the Yangtze River,and has a influence on the scheduling decision of Xiangjiaba Reservoir in the upstream of the confluence.To systematically analyze the impact of downstream water on the jacking of the water level below the Xiangjiaba dam,the relationship between the flow of Hengjiang River and the jacking of water level under Xiangjiaba dam was established by using the data from 2016 to 2023 and the principle of control variables.On this basis,the influence of Minjiang River flood on the jacking of water level under Xiangjiaba dam in 2020 was analyzed.The three-phase relation-ship between the water level of Yibin in the main stream and the water level and flow under Xiangjiaba dam was further established by using the drop index method.The results show that the ratio of the inflow of Minjiang River to the outflow of Xiangjiaba dam is exponentially related to the water level drop from Xiangjiaba dam to Yibin Station.When the flow rate of Hengjiang River is 300-2000 m^(3)/s,the jacking amount is 0.28-0.85 m;In 2020,the jacking of the maximum wa-ter level under the Xiangjiaba dam is 5.92 m.When the water level of Yibin Station is higher than 271 m,the water level under the Xiangjiaba dam will be affected by different degrees of jacking.

关 键 词：回水顶托 水位流量 落差指数 岷江 向家坝 

分 类 号：TV697.11[水利工程—水利水电工程]