Analysis of role of Xiluodu and Xiangjiaba hydropower stations in flood control of middle and lower Yangtze River

A brief description of Xiluodu and Xiangjiaba hydropower stations is given firstly.For the middle and lower reaches of the Yangtze River with numerous branches and characterized by complex flood composition,the design flood is determined based on several typical floods.The flood control and operation mode of the Three Gorges Reservoir is expounded;and the joint operation mode of Xiluodu,Xiangjiaba and Three Gorges reservoirs is analyzed.For this,a flood routing mathematical model is used to calculate the change of excess flood in the middle and lower reaches of the Yangtze River in case of different frequencies of flood events before and after the Xiluodu and Xiangjiaba hydropower stations are put into operation;and the role of Xiluodu and Xiangjiaba hydropower stations in flood control of the middle and lower Yangtze River is analyzed.Studies have shown that after the Three Gorges Project is built,the construction of Xiluodu and Xiangjiaba hydropower stations will further reduce the excess flood in the middle and lower reaches of the Yangtze River in case of flood events so as to improve the flood control situation of the middle and lower Yangtze River.