Abstract:

The three inlets river system is the link between the Yangtze River and the Dongting Lake,which is an important part of the Dongting Lake Area.In recent years,as the further effect of the climate change and human activity,the evolution of the riverlake relation presents a new feature and the water environment problem in this region is becoming more serious.Through the deep analysis of the longterm hydrological and water quality data of the representative stations in this region,from the annual and interannual dimensions,the water environmental evolution trend of this region was systematically discussed.The result showed that the interannual variation of water quality was worsening.Annually,the concentration of permanganate index and TN was higher in dry season and lower in rainy season,whereas TP was higher in rainy season and lower in dry season.And then the driven mechanism of water environmental evolution was analyzed from the aspects that influence the water quality and quantity.Finally,a initial control strategy to the water environment in this region is constructed from the construction of water conservancy projects,control of the nonpoint pollution and the formulation of law and regulations as well as the water saving publicity and so on.〖HJ1〗〖HJ〗