Kunming Basin, The Northern End Of The Pore Water Chemistry In The Past 20 Years Field Evolution Process And Its Driving Factors

With the progress of global urbanization trend, the water environmental problem such as surface water worsening, underground water pollution and the transport of pollution sources is more obviously, which has seriously influenced the sustainable development of social economy. 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. The study of chemical fields and its evolution makes great insights on the water fields chemicals forming, distribution, and its time-domain evolution characteristics, and also can offer scientific basis for reasonable exploitation and ecological environmental protection of water resource, as well as directs human activity scientifically, make harmoniously development of nature and mankind.Through the analysis of the pore-water quality by monitoring materials for many years in the research district, we have done a lot of work on the statistics characteristic of main chemical component quality density and spatial distribution, addition, the spatial distribution and influence factor.of water mineralization, hardness and chemical type were put into profound discuss.The spatial variation and temporal evolution of Groundwater chemical can directly show the different aquifer condition in the area, and also indirectly indicate the outer influence indensity of human activity, which reveal the general characteristic chemical field evolution of groundwater. The water flow in different aquifer to and difference influenced of external human activity, were the basic reason that caused the complicated variation of groundwater chemical field. The mineralization on temporal evolution is different all around the regional, and it can be concoluded into three types: rising trends, stabilizes state and the drop ones. The variation of the chemical type of groundwater has revealed that the way of land utilizes and the artificially influence of pollutes intensity, to a great extent, change the underground water environmen. The pollution of the ground water presented the trend aggravated day by day for many years.The forming and evolution of groundwater chemical component were the productsof particular natural geology environmental progress and mankind activities influence is changed constantly. Through employing the analytic approach of the factor analysis, give a further investigation that natural evolution, agriculture and sanitary sewage pollution and industrial pollution respectively were the three functions that contributed to form and influence the groundwater chemical component.The 3-Nitrogen pollute of the porewater in Kunming, become a general problem of water pollution already, 3-itrogen pollution of groundwater is the direct result of the human activity, and urban pollution as well as agricultural pollution are the two forms polluted the groundwater. Research analysis indicate that geological environmental states of shallow layers espatially soil oxidize condition influence the 3-itrogen migrations transform and distribute greatly, keeping in touch with good oxidizing condition, NO₃-N is relatively serious in pollution, in reverse condition,it shows that NH₄-N, NO₂-N polluted badly. In addition, in addition, exceeding and quarrying groundwater.can expand the range of the 3-Nitrogen pollution.In the past 20 years, the human activity impact on underground water environment of Kunming basin is mainly show that the urbanization progress caused the pollution of the underground water. In whole basin, according to the city's development of Kunming, the development trend of the underground water environment in different areas differs greatly. In the position of the centre city, groundwater water quality demonstrates a kind of gradually stable course; the agriculture planting area along the southern lakeside and the district that the city expanded, groundwater water quality still presents the trend worsening constantly; in the area nearside the grass lake, groundwater water quality demonstrates the situation taking a favorable turn constantly. The urbanization process has caused the groundwater water quality changed differently in the district; which indicate that the urbanization process has a twe-side impact effect on groundwater water quality.