Analysis on the flood control role of theThree Gorges Project for typical floods of the Dongting lake

According to the compensation regulation mode of the Three Gorges Project aimed at the Jingjiang and Chenglinji areas after its completion, the analysis and computation on the 3 kinds of different typical composite floods of 1996, 1998, 1999 in the Dongting lake area are carried out by large lake flood routing model. The computation results demonstrate that the different real-time regulation schemes have different roles and for different composite floods the different real-time regulation schemes have different effects; for the short time-duration and severely encountered floods of the Yangtze river and 4 main rivers in Hunan Province, the Three Gorges Project has significant flood control effect, but for the flood mainly coming from the 4 main rivers of Hunan Province and long time-duration and severely encountered multiple flood peaks of the Yangtze river and 4 main rivers in Hunan province, the Three Gorges Project has minor flood control effect.