Ecological Sound Operation of Cascade Reservoirs on Lower Yalong River

The research progress of ecological sound operation of reservoir is Summarized into two aspects-simulation method and optimization method. Through analyzing the decisive role that flow regime plays in the river ecosystem, an effective way to realize the harmony between human and nature by operating a reservoir to control the flow regime is found out. On Lower Yalong River of China, based on the rational flow cross-sections choice according to the location and regulating ability of each reservoir, a number of flow variation control schemes are presented with respect to the ecological requirement of these two flow control points. Then, a long-term optimal operation model is established and solved to maximize the total output of power generation of the cascade reservoirs. The total power generation amount and reservoir release discharge process corresponding to each flow variation control scheme are obtained. These influences on energy output of each hydropower stations are analyzed and compared. Moreover, a power loss index for ecological water demand is defined to quantify the influences on total power generation amount of different flow control schedules.