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Impounding in Advance for Three Gorges Reservoir by Considering the Downstream Drought Resistance

To solve the contradiction between Three Gorges reservoir impounding and downstream drought resistance in flood recession period, impounding in advance scheme is studied in this paper. Firstly, an improved impounding mode by strictly satisfying the downstream drought resistance discharge constraints is proposed. Then, by comparing from the aspects of annual average fill storage rate, final water level, power generation, surplus water and flood risk of different impounding time schemes, the optimum improved impounding scheme is determined and validated by typical year 1996. The study can proved scientific guidance for drought control of Three Gorges reservoir.