Study on joint operation of parallel reservoirs considering both water resources and water ecology

On the basis of normal operation, reservoirs usually consider the water demand of downstream reach close to the dam.If the characteristics of reservoir itself and the upstream and regional inflow, the water demand of the key control section of downstream main stream can be considered and jointly regulated, the guarantee rate of the minimum discharge flow index of the key control section in the main stream can be improved.In this paper, a set of joint regulation method system orienting to water resources and water ecology was established.By obtaining the control section demand index of the mainstream and tributaries of the parallel reservoirs and the discharge of the reservoirs and the river interval, the operation states of the reservoirs were described, the joint regulation objectives of the reservoirs were determined, and the real-time discharge optimization of the reservoirs were finally realized.This paper chose the Lishui River Basin as an example study to verify.It is demonstrated that compared with the natural inflow conditions, the single regulation scheme and the joint regulation scheme of parallel reservoirs can both improve the guarantee rate of the minimum discharge flow at the control sections in the mainstream and tributaries.And the joint regulation scheme can significantly improve the guarantee rate of the minimum discharge index of the main flow control sections on the basis of ensuring the guarantee rate of the minimum discharge index and the power generation efficiency of the tributary section.The research results can be valuable references for improving both the water utilization rate of parallel reservoirs and the guarantee rate of the minimum discharge of the mainstream control section.