Trend Forecast for the Influence of the Three Gorges Project on the Water Environmental Capacity of Dongting Lake

Based on a series of research works on water environment monitoring and water resources protection in Dongting lake, this paper discusses the strategy of sustainable development about the requirements of water function and protection objectives, and quantitatively analyzes the variation trend of water environmental capacity of major pollutants before and after the running of the three Gorges project. It is analyzed that the water environmental capacity of Dongting lake can increase in dry season and the value can decrease in a small scope in wet season, due to the remarkable change of the hydrological conditions caused by the running of the three Gorges project.