南水北调工程对北京地区生态环境变化的影响研究

南水北调引水工程实施后,对北京市的供水面积达700km^2。供水范围内的水位将会有不同程度的上升,10年后北京市地下水资源储存量将增加16.8×10^8m^3,缓解北京水资源短缺的现状。同时,不可避免地改变目前的地质环境状态：地面沉降灾害将减缓;地下水总硬度将会降低等;改变建筑物抗浮能力,造成已有地下建筑物的设防水位和防渗水位的变化、地下室可能出现渗漏问题;砂土液化的范围将扩大;供水区域内非正规固体废弃物填埋、堆放场的固体废弃物受到地下水不同程度的浸泡,产生大量的垃圾浸出液,浸出液中污染物进入地下含水层后,势必对附近的地下水造成了不同程度的污染等环境地质问题。

Study on the impact of south-to-north water transfer project on the ecological environment changes in Beijing

The water supply area will be 700 km~2 after south-to-north water transfer project is carried out.The groundwater table within the area will increase and the groundwater resources of Beijing will increase 16.8 x 10~8 m~3 after ten years which will reliere water shortage in Beijing.At the same time,groundwater table increasing will inevitably change the status of geologic environment and result in some advantageous and adverse effect.Land subsidence will reliere and the total hardness of groundwater will decrease.Groundwater table increasing will change the capacity of anti-uplift of current underground buildings,which will change their anti-uplift water level and result in the leakage of basements.The area of sand liquefaction will enlarge.The solid waste under the ground and on the ground within the supply area will be dipped in the groundwater and result in a great deal of water percolate which will enter into the aquifer and pollute the surrounding groundwater.