关键词: CE-QUAL-W2, 水华控制, 水动力调控, 水库生态调度, 香溪河, 三峡水库

Abstract: Aiming at the frequent algal blooms in spring at the Xiangxi River Bay after impoundment of Three Gorges Reservoir, a total 2D hydrodynamic mathematical model for Xiangxi River-TGP reservoir was established based on the CE-QUAL-W2 model. The velocity of the Xiangxi River Bay under different hydrological conditions and operating units of TGP hydropower station in spring were simulated. The simulation shows that when the upstream flow of the Xiangxi River is small, the velocity of surface water in the retention area is smaller than the critical velocity 0.05m/s for algal bloom habitat; when the upstream flow increases to an appropriate value, the velocity of surface water in retention area could be greater than 0.05m/s; the improving effect on the flow velocity at the bay only by small scale daily regulation of TGP is very limited, while the improving effect on the flow velocity by co-regulation of the reservoirs on the main stem and tributary is obvious and the algal bloom in the Xiangxi River Bay can be controlled .

Key words: CE-QUAL-W2, water bloom control, hydrodynamic regulation, reservoir ecological regulation, Xiangxi River, TGP reservoir