The Influence Of Urbanization On The Structure Of Water Pollution In Dianchi Lake Basin

With the advent of the information age, the electronic and network technology develop rapidly.At the same time, international Economic Globalization is coming.At comes next is urbanization movement. Since 1979,China’s fast-developing urbanization shocked everyone.And it for the first time exceeded 50% in 2011,which means that China’s urbanization has entered a stage of rapid time. However, with the accelerated development of urbanization, the scopes of human activities expand.This not only increases the human disturbance of the environment, but also increased the external pollution.The impact on the environment of the city is increasing: soil erosion and oil erosion,atmosphere deterioration,water shortages and deterioration of water quality.Lake water is an important component of the environment. Its irreplaceable ecological function can’t be replaced. But with the increased urbanization,the population erupted and the land use changed, causing the deterioration of lake water environment and affecting the normal functioning of the lake.They are seriously restricting the sustainable development of human society.This paper is based on the above facts,using the Dianchi Lake Basin as a case study to explore the impact of urbanization process on lake water quality and water pollution. Specific methods are: Firstly,using the technical means of RS, GIS, statistical analysis and field investigation handle the original image from 1992 to 2012, in order to get the history and current date of urban land area andto observe the trends.Then combined with the land use typecalculate watershed nonpoint source load generation get its trends.Thenanalysis of the urban population and economic data calculate indicators of urbanization. Combined with date of per capita pollution load generation and sewage treatment, calculate the point source pollution load and analyzing the changes over the years.Then,analyze the water quality data, research pollution situation and structural changes in the characteristics of the type of each period.Finally, by comparing the pollution loads of point source and nonpoint source with the water pollution characteristics of structural changes, establish the relationship between urbanization and pollution structure type.Studies have shown that:(1)From 1992 to 2012 the rapid development of urbanization in Kunming, population growth, and the tertiary industry has become a new pillar instead of the second, while arable land in the watersheddeclined, a urban land areasubstantial increase.Where the contribution of urban land is the highest,and the main source of pollution.(2)Urbanization continues to accelerate, resulting in the amount of point source and non-point source load continues to increase. Although the point source pollution has been effectively cut gradually, but generation of urban nonpoint source load increased significantly.(3)Dianchi-Caohai Lake andurbanization of watershed is in line with the law of EKC. The relationship between them entereda period of transition from the antagonistic stage to the Run-in period in 2005. With the improvement of the level of urbanization, Dianchi-Caohai Lake water quality gradually improved.(4) Dianchi-Waihai Lake’s non-point source pollution of COD and TN have gradually replaced as the main factors causing pollution, while TP still in the common role of non-point and point source pollution.However, non-point source of urbanload up the rapid pace.In the absence of effective control of it organic pollution increased, resulting Dianchi-Waihai pollution types from a single type of eutrophication become both organic pollution type. If we don’t take effective measures to control urban non-point source as quickly as possible, then Dianchi-Waihai eutrophication will become increasingly serious.