Groundwater response to intensive mining in ecologically fragile area

In order to study the influence of high intensity coal mining on the groundwaterlevel in Yu-shen-fu area,and analyze the relationship between phreatic decline and coal mining intensity,authors draw the groundwater level contour map in 1995 and 2014 through data collection and field investigation,then obtained the groundwater level variation and the relationship of mutual-feed joint-variation with coal mining intensity through map overlapping. The results indicate that:① 73. 0% of regional groundwater level does not change significantly,but there are 758. 9 km2 where the ground- water level lowers more than 8 m,accounts for 7. 3% of the study area,thus it has a large impact on the regional groundwater balance. ② The high intensity coal mining is the main driving force that causes the groundwater level de- cline more than 8 m,71. 5% of which is concerned with mining scale. ③ Water flowing fracture zone and aquifer char- acteristics are two factors to control the range and degree of groundwater level variation. Coal mining with water-contai- ning is extremely important to achieve the harmonious development of resources and environment.