Research on Relationship Between Water Level and Backwater Jacking of Xiangjiaba Dam
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 300-2 000 m3/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.
backwater jackingwater level flowfall indexMinjiang RiverXiangjiaba dam
万方数据
维普
