Study on the impounding time and objective decision of the Three Gorges Project at the end of flood period

To counter the contradictions among the electricity generation, flood control and navigation in the Three Gorges Project (TGP) operation, the flood risk and the benefit of generation and shipping in different impounding schemes is studied, the reservoir water sediment regulation multi-purpose decision model is developed by the relationships between the flood risk, generation and shipping benefit, in order to study its optimum impounding time and mode, and a weighted balance mode is applied to decide an optimum impounding scheme.The results can be used for the TGP operation.