基于复合权重-GIS的下辽河平原地下水脆弱性评价

Groundwater vulnerability assessment in Lower Liaohe River Plain based on GIS Model with Co-Weights

在传统的DRASTIC模型基础上,结合下辽河平原的实际情况,从水质和水量两方面考虑,建立下辽河平原地下水脆弱性评价指标体系。通过层次分析法(AHP)与熵权法确定评价指标在满足主客观条件下的综合权重。结合GIS的地图计算功能对该地区的地下水脆弱性进行评价,同时用硝酸盐氮的质量浓度对评价结果进行了验证。评价结果表明下辽河平原50.39%的地区地下水脆弱性较高,并且相对于脆弱性低的地区有较高的硝酸盐氮浓度。

On the basis of the traditional DRASTIC model, and according to the water quality and water quantity of the Lower Liaohe River Plain, a groundwater vulnerability assessment index system for the Lower Liaohe River Plain is constructed. Considering the objective and subjective conditions, the comprehensive weight of the assessment index is determined with the analysis hierarchy process （AHP） and entropy weight method. Combined with the mapping calculation function of GIS technology, the groundwater vulnerability of this area is evaluated.The nitrate nitrogen concentration is applied to test the results of the vulnerability assessment. The results showed that 50.39% of the Lower Liache River Plain has higher vulnerability, in the form of higher nitrate nitrogen concentration than the areas with lower vulnerability.