基于AHP和DRASTIC模型的红层区地下水脆弱性评价研究--以衢江中下游流域为例

Assessment of Groundwater Vulnerability in Red-bed Area Based on AHP and DRASTIC Model-Take the Middle and Lower Reaches of Qujiang River as an Example

以衢江中下游流域内红层区地下水为评价对象,采用AHP和DRASTIC模型及GIS空间分析技术对红层区地下水脆弱性进行系统评价,并结合评价区地下水环境污染现状,半定量分析了此次红层区地下水脆弱性评价结果的准确性。结果表明:(1)区域红层区地下水脆弱性总体呈中等-较高水平,约占全区总面积的82%,主要受制于红层含水介质影响;(2)区域内红层区地下水脆弱性评价结果与地下水污染现状评价结果基本一致,在高脆弱性地区地下水污染较为严重,大部分区域未达到国家地下水质量Ⅲ类水标准,少数地区达到Ⅴ类水标准;在较低脆弱性区域地下水水质较好,均达到国家地下水质量Ⅲ类水标准。

Based on AHP and DRASTIC model and Gis spatial analysis technology,the authors systematically evaluated the vulnerability of red shallow groundwater in the evaluation area,and analyzed the accuracy of the assessment results of the vulnerability of red shallow groundwater in the evaluation area combined with the status of groundwater environmental pollution.The results show that:1)The vulnerability of shallow red groundwater in the evaluation area shows a medium-high trend,accounting for about 82%of the total area of the evaluation area,and is mainly influenced by the red water-bearing media.2)The evaluation results of vulnerability of red shallow groundwater in the evaluation area are basically consistent with the evaluation results of groundwater pollution status.The groundwater pollution in the high vulnerability area is serious,most of the areas do not meet the national drinking water standard of ClassⅢ,and a few areas meet the national drinking water standard of Class V;The groundwater quality in low vulnerability areas is good,and all of them meet the national drinking water standard of ClassⅢ.