Research On Influence Of Three-Gorge Project Running On Water Pollution And Water Environment Capacity In The Dongtin Lake

The Dongting Lake is the first largest lake in Hunan Province, it is important territory resources to have many kinds of important functions. But the lake itself has been already facing a great deal of water environment problems. Three-Gorges Projects in Yangtse River plan to all set up in 2009. After its running ,The aim of this text announce it's relevant influence to the Dongting Lake, This text main research and appraise water quality current situation of the Dongting Lake, and find out the main pollutant which influences water quality of the lake, and analyse to its origin cause; and Probe into the basic demand of the water environmental quality in the Dongting Lake for the sustainable development strategy; On the basis of studying above ,and take into account the project influence , and predict emphatically what are the development trends of the water pollution and the capacity of water environment of the Dongting Lake after Three-Gorges Projects runs , and put forward the countermeasure and suggestion of protecting the water environment of the Dongting Lake.The result of study indicates , the overall water quality of the Dongting Lake is fair, but these total nitrogen and total phosphorus are outstanding in pollution, at present, The rich nutrition state of the Dongting Lake is come into contact with rich nutrition grade. The immediate cause is discharge to these industrial and agricultural and life's pollution sources etc, But the agricultural pollution sources is the main reason that cause nitrogen and phosphorus pollution. Because the runs of the Three Gorges Projects causes the remarkable changes of the hydrology and silt of the Dongting Lake, it's make the slightly aggravate trend of water pollution and rich nutrition grade in the Dongting Lake, but rich nutrition grade nutrition still is come into contact with rich nutrition grade. After Three-Gorges Projects runs ,The change of the capacity of water environment of the Dongting Lake is as a whole increase when water level redound in dry season, and make water environment capacity of the lake increase to some extent, but every month of range increased is different to some extent.