云南高原岩溶山区地下水脆弱性评价--以泸江流域为例

Evaluation of Groundwater Vulnerability in Yunnan Plateau Karst Mountainous Area in the Lujiang Basin

根据云南高原岩溶山区石漠化严重、岩溶极其发育、山高坡陡、地下水径流途径长等特征,本文以泸江流域为例,并选取地下水位埋深、石漠化程度、岩溶发育程度、植被覆盖率和地形坡度作为该区地下水脆弱性评价指标,对这5个指标实际值进行量化,用层次分析法确定各指标的权重值,并建立了适合该区域的地下水脆弱性评价系统与DRKVT模型。用Arcview3.2的空间叠加分析功能,完成对泸江流域地下水脆弱性评价。最后用地下水污染现状评价结果来对模型进行检验,结果表明,该模型评价结果与流域地下水污染现状评价结果基本一致。

According to the characteristics of serious rocky desertification, strongly karst, high and steep mountains and long runoff way in Yunnan plateau karst mountainous area, an ease study was conducted in the Lujiang basin to analyze five major factors that influence the frangibility of groundwater in this area, including the bury of groundwater, stony desertif cation degree, karst development degree, vegetation fractional cover and attitude of rock formation. To evaluate the frangibility of groundwater, the actual values of the five indicators were quantified firstly, and then the weighted values of all the indicators were determined using the analytic hierarchy process method. The suitable groundwater vulnerability assessment system for this area and the DRKVT model were build. The evaluation of the frangibility of groundwater in the Lujiang basin was conducted through spatial overlay analysis using Arcview 3.2 software. Finally the model was tested by using groundwater status evaluation results. The results show that the model evaluation results are basically consistent with present groundwater pollution evaluation results in the Lu jiang basin.