Based On The Dynamic Changes Of The Shallow Groundwater Of The Gis-plain Area Of ​​beijing

In recent years, the groundwater table decreased gradually and the ground water resource decreased gradually, because of the increase of population and the improve of urbanization level, and the decrease of precipitation, leading to demand of groundwater and exploitation amount increase gradually Author studied the utilization of groundwater from 1983 year to 2000 year in Beijing, and analyzed the influence of dynamic change to environment, in order to know the situation of groundwater.This paper introduced the general situation of nature social economy and geology. Then the paper analyses the dynamic change of diving and water-pressed and those reason. Because the datum in 1983 year only include suburb, so respectively analyses the change of water level from 1983 year to 1993 year and from 1993 year to 2000 year, and the change of whole plain from 1993 year to 2000 year. The result is: diving level descend in north middle and south, diving level ascend only in four city zone and its around the area of west mountainous area march with plain. The most of water-pressed descend. Besides the fall of the water-pressed water is greater than diving under water, in the north of plain district is greater than the south.Because groundwater level change seriously, this paper especially analyses the impact of precipitation and exploitation amount on dynamic change of the water level, these are two main influence factors of dynamic change of groundwater. In recent years, because the precipitation reduces, population increases, the water requirement increases gradually, make the exploitation amount of the groundwater increases year by year, so the water table drop seriously. Some area appear to large area of descend funnel, and the area is expanded year by year, because of the centralized and excessive exploitation.Dynamic change of groundwater and exceed exploitation cause corresponding environmental geological problems. This paper mainly analyses environmental geological problems such as descend funnel land subsidence . water quality deterioration produced by groundwater level change. Among them, descend funnel isdistributed mainly in regions of Shunyi of the north of plain district, Changping and Pinggu, at the same time the range becomes great, the water level decreased deeply , it is most serious in Shunyi. Land subsidence appears in Shahe-Dongsanqi, Pinggezhuang mainly. Water quality deterioration is serious in the urban area and adjacent place.In the end, this paper brings forward measures and countermeasure on improving the amount of groundwater and water quality.