基于熵权的TOPSIS方法用于地下水质量综合评价

地下水质量评价是地下水资源评价的重要组成部分.为提供一种合理的水质评价方法,详细介绍了基于熵权的TOPSIS方法在地下水质量综合评价中的应用.以石嘴山市大武口区第二水源地为例,通过在供水井中取样分析,评价了第二水源地地下水水质现状.结果表明,石嘴山市大武口区第二水源地地下水水质总体情况较好,地下水水质基本符合生活饮用水要求,超标的NH4＋主要是层间越流导致的上层水质较差的水进入供水含水层所致,F-主要源于水岩作用导致的含氟矿物的溶解.对地下水综合水质影响较大的因子为总铁、pH和NH4＋,重金属污染较小,但仍应加强水源地管理和保护,防治人为地下水污染.

Application of entropy weighted TOPSIS method in groundwater quality assessment

Groundwater quality assessment is an essential part of groundwater resources assessment.The entropy weighted TOPSIS method is introduced for the purpose of providing a rational way to assess groundwater quality.The No.2 drinking water source of Shizuishan City was taken as an example,and the groundwater quality in this water source was assessed based on water sample collection and analysis.The results show that the groundwater quality in No.2 water source is good and fit for drinking as a whole.The excessive NH4＋ in drinking groundwater is mainly caused by leakage exchange between upper aquifers with poor quality and lower aquifers.The excessive F-is usually caused by the water-rock interaction which makes the fluoride bearing minerals dissolve in the water.Total iron,pH values and ammonia nitrogen are the main factors affecting the comprehensive quality of groundwater and heavy metal pollution in the area is not serious,but enhanced groundwater management and protection are still needed for groundwater artificial pollution.