基于改进DRASTIC模型评价拉林河流域地下水脆弱性研究

以拉林河流域作为研究区,结合研究区实际条件对传统DRASTIC模型进行改进,利用层次分析法获得各指标的权重值,并应用ARCGIS的空间分析技术获取研究区地下水脆弱性分区,同时根据单参数敏感性分析方法对评价结果进行验证.结果表明,流域地下水以中等脆弱性和较高脆弱性为主,约占流域面积的85%.在选取的六个评价指标中,土地利用类型、地下水位埋深以及地形坡度这三个指标对流域地下水脆弱性影响最大.研究结果为拉林河流域地下水资源管理和污染防治提供理论依据.

Assessmentof Groundwater Vulnerability in Laling River Basin Based on Modified DRASTIC Model

In this paper, LalingRiver basin was selected as the study area andthe traditional DRASTIC model was modified according to the actual conditions. The weight value of each indicator was obtained by applying the analytic hierarchy process ( AHP) . The mapping of groundwater vulnerability of the study area could beachieved withaidof ARCGIS spatial analysis tech-nique. The single-parameter sensitivity analysis also confirmed the evaluation result. The result showed that groundwater vulner-ability of the study area was mainly medium and high vulnerability, accounting for about 85%. Among the six indicators, the land use type, depth ofgroundwaterand topography had the greatest impact on the groundwater vulnerability. The result provided theo-retical basis for groundwater resources management and pollution control forLalin River basin.