Based On GIS Technology Ground Water Heavy Metal Pollution Synthesis Risk Assessment Research

Groundwater is an important and indiscerptible part of the whole water environment. The world's total groundwater up to 150 million km 3, accounting for almost one-tenth of Earth's total water, the water than the Atlantic more. In China, 2006 National salinity≤2 g / L of groundwater resources in the region to 764.3 billion m3, including groundwater resources in the plain area of 166.8 billion m3, in Hilly Areas of groundwater resources for 628.4 billion m3, plain and between in Hilly Areas The double counting of groundwater resources to 30.9 billion m3.With the development of economic construction many people,organization and even government sometimes only pursue the partial maximum profit but ignore the negative influence on the environment. So the contamination of groundwater becomes more and more serious with the passing of year. What's more, this phenomenon is especially severe in many small towns and undeveloped areas.With the rapid global economic development, the heavy metal entries in the water through the artificial pollution,the geology corrodes and decency, such as mine mining,the metal smelting processing,the chemical waste emissions,the abusiveness of agricultural chemicals fertilizer and so on. But the heavy metal pollution is easily concentrated by the biology and it has the biology scale-up effect and it is also greatly toxic. Therefore the heavy metal not only has polluted the water environment, but also severely endangers the survival of humanity and each kinds of living things. Now in our country many work concerning research, practice and management of groundwater contamination lag behind the speed of groundwater pollution greatly. All of these not only lead to deterioration of environment but also arouse many social problems and even endanger social stability.Based on these problems the paper carries out investigations on groundwater pollution by heavy metal and take groundwater contamination in the town of Huangxing as the real example. It carries on the spatial analysis of the GIS technology to the actuality of the groundwater environmental pollution and grades its pollution factors through DRASTIC model. The paper makes the quantitative risk value to groundwater contamination of heavy metal of Huangxing town. Then it carries out the effective measures.