Kunming Basin Groundwater Chemistry Field Dynamic Characteristics And Genetic Analysis

According to the development of the economy of Kunming and the population's increase in the past 20 years,the polluted water enter underground from industry, agriculture and sanitary sewage has increased by a wide margin,which contributed to the great change of the underground water chemical environment of Kunming basin.Study the dynamic characteristics of chemical fields and its influencing factors in groundwater,can help to realize the forming,distributing of the chemical fields and its space-time variation rules in groundwater,also can offer scientific basis for reasonable exploitation and protection of groundwater resource.With environmental monitoring station's data of water quality,the paper analyzed the dynamics characteristic of the chemical fields of groundwater in north of the kunming basin,and also analyzed its influencing factors.The paper analyzed the space-time variation rules of the groundwater chemistry field through to analyze the two ways of bedrock water and pore water,and analyzed several typical parameters of chemical circulatory in groundwater,also analyzed the variation of the pollutant of Fe,P,N,F.â‘ The human activities' influence on bedrock water is small except some areas,for example,Shilipu in the hydrogeological unitâ…¤,Jiumenli in hydrogeological unitâ… and the south of hydrological unitâ…¢.The bedrock dynamic function and dissolution play comparative full role,especially at the edge of basin.The pollutant of Fe,F,P and N are excess at a few point.The pollution of NO₂-N,NH₄⁺ are the main contaminative forms.â‘¡The human activities was a important role in the variation of the chemical field in Pore water,and in the south of lakeshore area the pore water pollution were more seriously than north of the research area.With the increase of the city area,the pore water has different trends because of the different contaminative types,the pollution high value's areas linked up into a single stretch from 1983a to 1990a;the situation of pollution alleviated at the north of Caohai,but the situation of pollution aggravated at South of the lake-side plain.Pore water hydrodynamic function was dominant at the edge of basin,while the evaporating concentration function dominated in the south of lakeshore area.Domestic sewage played a larger role to pollution.Analyzing the distribution of Fe,P,F and N,we found industrial and agricultural sewage and domestic sewage contributed the pollution obviously.Among these components,N was the most serious pollution of these elements;the pollution form of N was NO_3-N mainly.Groundwater hydrochemistry field's change has two influential factors:nature functions and human activities.Nature function mainly included groundwater's replenishment,water-rock interaction,evaporating concentration and so on.Human not only exploit groundwater excessive and make water quality deteriorating increasingly,but also discharge pollutants which can penetrated into groundwater and alternated the groundwater hydrochemistry field.There have industry pollution,agriculture pollution, sewage used for irrigation pollution and rural pollution in research area,and the rural pollution distributed on the hole area.Because of the different pollution types and different accumulation conditions between of the bedrock water and pore water,the degree of pollution changed.