基于灰色关联度变权法的浅层地下水环境质量综合评价

Shallow Groundwater Environment Quality Evaluation Based on Gray Correlation Degree Variable Weight Method

引入指数型白化权函数对灰色关联度变权法中的白化权函数进行修正,使得能够对地下水更合理、客观、准确地评价。将晋江市浅层地下水看作一个灰色系统,在灰色关联度变权法模型基础上,对各水质监测点不同类别的隶属度和灰色关联度作对比分析判断其评价等级以及质量优劣次序,说明灰色关联度变权法对地下水环境质量综合评价方法适当。研究区内绝大多数地区水质状况良好,影响区域地下水质量的指标主要为TDS、锰、硝酸盐、亚硝酸盐、氨氮、氯化物,水质较差区主要分布于沿海工业分布较密集区及引污水灌溉农田地区,说明工农业发展、人类活动加剧及海水入侵是造成本区水质变化的主要原因之一。

Using the exponential type whitenization weight function to amend the whitening function of the grey correlation method of variable weight makes it possible to evaluate the groundwater more reasonably,objectively and accurately.In this study,the shallow groundwater in Jinjiang city is seen as a grey system,based on the grey correlation method of variable weight,different categories of membership degree and grey correlation degree at different water quality monitoring points are comparatively analyzed to determine its grade,quality priority.The result indicates that the grey correlation method of variable weight is appropriate for comprehensive assessment of groundwater environment quality.The water quality in the vast majority of the study area is in good condition.The main indexes influencing regional water quality are TDS,manganese,nitrate,nitrite,ammonia,and chloride.The zones with poor water quality are mainly distributed in the more intensive industrial distribution and the sewage irrigation area,which means that the industry and agriculture development,the increasing human activities and seawater intrusion are among the main reasons for water quality change.