The Study Of The Effect Of Coal Mining To The Regional Groundwater Resources

Water resource problem is one of the world's close environmental issues. China is relatively a country lack of water, particularly in the coal mining areas. Large-scale exploitation of coal resources, while promoting the sustained and stable development of China's national economy, on the other hand, the occurrence of the natural conditions of groundwater resources have been severely damaged. And the contradiction between the supply and requirement of water resources is becoming aculeate increasingly. Shanxi province is a major coal production base of China.This paper investigated forty-five mines distribute around Xiangyuan County, Shanxi province, particularly investigated eighty-six villages around the mines and the villages' eighty-six wells' decline of groundwater level status. According to simple correlation analysis (Pearson),linear trend analysis,Independent Samples Test(t'test) and calculation of arithmetic mean, focusing on investigating the impact of coal exploitation on groundwater level plays an important role on Xiangyuan County's coal exploitation and the protection of groundwater resources. Coal-water coexistence is a very important feature of coal exploitation in Shanxi province, and coal exploitation has great impact on water resources.The researches as following:1. The declines of groundwater levels in each region' villages have no obvious relevance with the villages' population (0.24),altitude(-0.02) and the groundwater levels before coal exploiting(0.07). That is to say. the villages' population,altitude and the groundwater levels before coal exploiting have little impact on the declines of groundwater levels.2.The circumstance of each region has a similar water resource before coal mining, it shows that these is some difference during the underground water change of the wells located in the three different region(P<0.005),this research proves that the underground water will descend dramatically if its location is very near the coal. That is to say, the coal mining has significant impact on the underground water environment.3.According to Linear trend analysis and t'test; The declines of groundwater levels in the three different areas are very different. The groundwater level decreased the most in the village wells which is nearest to the coal mines(77.9m), followed by the nearer village well(21.2m) and the last is the groundwater level in the farthest village well from the coal mine(7.3m). This further proved that:coal mining is an important factor affecting groundwater resources, and has different influence along with the difference of location. And there is a inverse relationship between the extent of influence and the distance from the coal mine field. That is, the closer from the coal mine field, the damage to underground water resources is more serious, and the more groundwater level decreases, and is less in contraction.