The Research Of Water Environmental Capacity Based On Uncertainty Model Of Xiangjiang River Section In Chang-Zhu-Tan

Water resource is very important to human being.The 21 centuries cities water resource international discussion is disclosed, The United Nations already lists our country as one of 13 countries who lacks for water most in the world. With the increasing of using water resource, water pollution become more gravely now.It requires us that we must try one's best to take effective measures protecting water resources.In recent years,people has enlarged the exploitation to the water environment unceasingly and has made use of, water environment capacities already becomes the indispensable important for water pollution.This paper introduces the main pollution contamination situation of two-oriented society -resource-saving and environment-friendly Chang-Zhu-Tan.Sanchaji section'water is contaminated most grave in changsha section.The sewage draining exit focuses on industrial Zhuzhou city, Xiawan bay is most polluted. Ma jia River and five-star section contamination are comparatively grave in Xiangtan section.Water resources,one of the ecological environment,as an important component for the production of human life is of obvious importance.Water environment is developed more in recent years.Based on water pollutants of Xiangjiang river section flowing Chang-Zhu-Tan and analyzed the environmental monitor dates,this study calculates and analyzes water environmental capacity based on two-dimensional model quality evaluation.This paper adopts the uncertainty interval analysis mathematics method to calculate water environment capacities. A great quantity of investigation sometimes adopt average value in quality evaluation data, that capacities secretly scheme against in the different period and the different place to the environment may produce certain error. There are some uncertainty hydrology datas, however, the water quality model can calculate out more accurate result on interval analysis determinacy model basis. Under the datas studying by large amount of pollution source inquires into and counts capital, it chooses a uncertain model.It uses pollution COD and NH3-N as an object of this study.With interval analysis mathematics-based two-dimensional water quality model, adopt steady state analysis to have explained, it has calculated and analysed the water environment capacities interval datas value owing area COD and NH3-N.The results shows that environment capacities upper limits of xiangjian river of Chang-Zhu-Tan water COD is 69446 t/a and lower limit data is 62570 t/a,the upper limits of NH3-N environment capacities is 6870 t/a and lower limit data is 6216.6t/a. Current COD discharges quantity being 102052 t/a, is 1.6 times more than the maxima allow amounts of environment capacities and discharges 19951t of the NH3-N year is 2.9 times more than Ultra-environmental capacity. COD and NH3-N would respectively cut down 35% and 67% at least to satisfy the need of allowed emissions. This calculation provides a basis for the total control of Chang-Zhu-Tan water function area Xiangjiang River control unit and assignment scheme.