基于AHP的DRASTIC模型对莱州地区地下水脆弱性研究

Study of groundwater vulnerability in Laizhou using AHP-based DRASTIC model

地下水脆弱性评价是作为地质环境评价的一部分,目前国内外已有众多研究,并提出多种评价模型,其中以DRASTIC方法模型使用最为广泛。AHP(层次分析法)是一种层次权重决策分析方法,综合专家经验与理论数据,可以实现定性与定量二者有效的统一结合,更真实客观的反映研究区评价结果。文中以莱州地区为研究区,在全面调查区内的地质条件、水文地质条件、地形地貌、气象等实际情况的基础上,利用AHP法对目前使用的DRASTIC方法模型进行改进。对原模型中的7个参数进行权重重新取值,然后建立一套符合研究区的地下水脆弱性模型,并进行评价分区,最终绘制了地下水脆弱性分区图。

Groundwater vulnerability assessment is part of geological environment assessment.At present,there are many studies at home and abroad,and a variety of evaluation models are proposed,among which the DRASTIC method model is the most widely used.AHP(Analytic Hierarchy Process)is a hierarchical weighted decision analysis method.Combining expert experience with theoretical data,it can achieve an effective combination of qualitative and quantitative,and more realistic and objective reflection of the evaluation results of the study area.In this paper,the Laizhou area is used as the research area.Based on the geological conditions,hydrogeological conditions,topography and meteorology of the comprehensive investigation area,the DRASTIC method model currently used is improved by the AHP method.The weights of the seven parameters in the original model were re-valued,and then a groundwater vulnerability model conforming to the study area was established,and the evaluation was divided.Finally,the groundwater vulnerability map was drawn.