重庆主城都市区地下水质量与污染评价——基于层级阶梯评价法

Groundwater Quality and Pollution Assessment in Urban Area of Chongqing:Based on Hierarchical Ladder Evaluation Method

为查明重庆主城都市区的水质及污染状况并区分天然背景和人类污染对地下水水质的影响,进行了地下水采样和测试,利用层级阶梯评价法,对地下水水质和污染状态进行了分析与评价。结果表明,研究区内地下水受到天然背景和人类污染的共同影响,Ⅲ类和Ⅳ类水为主要水质类别,各占45.9%,主要的超标指标为硝酸盐、锰、砷、总硬度等,研究区地下水有机污染程度为轻微,农业面源污染和未经处理的生活排污是地下水污染的主要原因。相比传统的单因子评价数学方法,层级阶样评价法将污染源纳入考虑,突出了人类污染属性,对于地下水污染防治可以提供更有针对性的决策。

To find out the water quality and pollution situation in urban area of Chongqing and distinguish the influence of natural background from that of human pollution,this study carvied out groundwater sampling and testing were carried out,a hierarchical ladder model was established to analyze and evaluate groundwater quality and pollution status.The results showed that the ground-water in the study area was affected by both natural background and human activities,III and IV classes were the main types ac-counting for 45.9%,respectively.The main exceeding indicators were NO_(3)^(-),Mn,As,total hardness,et al.Groundwater is slightly polluted by organic indicators,agricultural non-point source pollution and untreated domestic sewage discharge were the main rea-sons of groundwater pollution.Compared with traditional mathematical methods such as single factor evaluation,this model takes pollution sources into account,and highlights human pollution attributes,so it can prouide targeted decisions for groundwater quali-ty and pollution control.