基于DRASTIC方法的地下水污染脆弱性评价

目前许多地区的地下水因过度开采以及工业活动而受到了不同程度的污染，特别是在经济发达地区，由于化肥的过度使用。给地下水系统带来了严重威胁。本文结合典型案例研究区一江阴市地下水监测网络及其监测数据，应用AHP（层次分析法）对DRASTIC法各指标权重进行重新确定，并对案例区进行了地下水脆弱性评价。在此基础上，在DRASTIC指标体系中加入硝酸盐浓度因子作为特殊脆弱性影响因子，应用GIS空间分析功能得出研究区地形图。研究结果显示：研究区大部分地区属于较易受污染地区，少数地区不易受污染。脆弱性评价结果较好地符合了水质状况，在指导地下水资源规划以及生产活动具有一定的理论及实际意义。

Groundwater Vulnerability Assessment Based on the DRASTIC Method

The groundwater pollution in many regions is becoming more and more serious because of over - exploiting and industrial ac- tivities. Typically , the groundwater system in intensive planting area is facing with serious threat of pollution from over - using of fertilizer. In this paper, AHP （ Analytic of Hierarchy Process ） method was used to reset the weights of DRASTIC parameters referring to the conditions of intensive plantation in Jiangyin city and to evaluate the groundwater vulnerability. The results show that the groundwater in most of the study area was susceptible to pollution; A minor of area is less susceptible to the groundwater pollution. The evaluation results for groundwa- ter quality is consisted with the actually situation in study area. The work is helpful in guiding a theoretical and practical regulation for groundwater resource.