西南岩溶区典型地下河流域地下水脆弱性评价

以贵州省四方洞地下河为例,将影响该区地下水脆弱性的6个主要因素,即出露地层、地下水埋深、石漠化程度、植被覆盖率、土层厚度、岩层产状,作为评价该区地下水脆弱性的指标,对这6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,建立各评价指标实际值及其权重值与地下水脆弱性的函数关系式,以量化单个点(小区域)的地下水脆弱性,最后用Arcview3.2的空间叠加分析功能,完成对四方洞地下河流域地下水脆弱性的评价。

Evaluation of frangibility of groundwater in a typical subterranean river basin in karst area of Southwest China

A case study was conducted in the Sifangdong subterranean river, a typical subterranean river in Guizhou Province, to analyze six major factors that influence the frangibility of groundwater in this area, including the emergence stratum, bury of groundwater, stony desertification degree, vegetation fractional cover, soil thickness, and attitude of rock formation. To evaluate the frangibility of groundwater, the actual values of the six indicators were quantified first, and then the weighted values of all the indicators were determined using the analytic hierarchy process method and the frangibility of groundwater in certain areas was quantified by establishing the functional relationship between the actual and weighted values of the indicators and the frangibility of groundwater. The evaluation of the frangibility of groundwater in the Sifangdong subterranean river was conducted through spatial overlay analysis using Arcview 3.2 software.