基于GIS的DRASTIC下辽河平原地区地下水防污性评价

ASSESSMENT OF GROUNDWATER VULNERABILITY IN THE LOWER LIAOHE RIVER PLAIN WITH DRASTIC METHOD BASED ON GIS

在运用基于GIS的DRASTIC评价方法,对下辽河平原潜水的防污性进行评价的过程中,分析了影响下辽河平原固有防污性的最主要的7个水文地质参数,分别评价各个因子.利用GIS的空间分析功能中区对区的合并分析功能,依次对各单指标分级图进行区合并操作,合并后生成区文件,绘制出防污性分布图.结果表明,防污性能较差区主要分布在下辽河平原河谷地带,面积2 993.51 km2,占全区总面积的12.78%.评价结果有利于合理利用土地,有效保护地下水资源和防止地下水污染.

The authors evaluate the groundwater vulnerability in the Lower Liaohe River Plain with GIS-based DRASTIC method, analyze 7 major hydrogeological parameters that affect the vulnerability, and evaluate each factor respectively.Using merger analysis of spatial analysis function in GIS, the classification graphs for each single index are integrated to generate zone files and vulnerability map. The result shows that the areas with poor antifouling property are mainly distributed in the valleys of Lower Liaohe River Plain, with an area of 2993.51 km2, accounting for 12.78% of the total. The assessment result is beneficial to the rational utilization of land and effective protection of groundwater resources.