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Water environmental capacity for the reservoir of Three Gorges Project
Abstract :The pollution situation of the reservoir in Three Gorges Project is analyzed and the design philosophy, design hydrologic condition and the target of water quality protection for the calculation of water environmental capacity of the reservoir are proposed. The 1-D flow water quality model,2-D depth averaged k-ε model and 3-D multi layer turbulent model are applied to calculate the macro environmental capacity and bank ′s environmental capacity of CODMn and NH3-N as well as its assignments along the reservoir before and after the completion of the Project. On the basis of comparison among several design schemes for the bank ′s environmental capacity, the acceptable criteria for the pollution mixing zone and the comprehensive scheme of water environmental capacity for the reservoir are recommended.
Key words :reservoir of the Three Gorges Project; water quality model; pollution mixing zone; water environmental capacity .