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以福建省晋江市调查获取的浅层地下水数据为基础,对25项测试指标的地球化学特征进行了统计,从变异系数分析该区浅层地下水中Mn2+、SO42-、NO2-、Cl-、PO42-等指标CV%大于1,说明受外界因素影响较大,其他指标受影响较小,空间分布较稳定。根据Piper三线图划分标准,该区浅层地下水类型主要为Cl-·HCO3-—K++Na+·Ca2+型。参照地下水质量标准,对该区浅层地下水进行了环境质量综合评价,结合GIS和地统计构建地下水环境质量数字地面模型,结果表明该区整体综合环境质量状况较好,优良率达到81.67%,但评价结果处于Ⅳ类和Ⅴ类的浅层地下水占17.06%,主要为TDS、Cl-、NO3-、NO2-、NH4+超标,分析认为与海水入侵,农业生产,工业、生活污水排放有关。
Based on the data of shallow groundwater collected from Jinjiang City of Fujian Province, the geochemical characteristics of 25 test indicators were calculated. From the variation coefficient, Mn2 +, SO42-, NO2-, Cl-, PO42 - If the indicator CV% is greater than 1, it indicates that it is greatly affected by external factors and other indicators are less affected and the spatial distribution is more stable. According to the Piper three-line plot division standard, the shallow groundwater types in this area are mainly Cl- · HCO3- K ++ Na + · Ca2 +. According to the groundwater quality standard, the comprehensive evaluation of the environmental quality of shallow groundwater in this area was carried out. According to the GIS and geostatistics, the digital terrain model of groundwater environmental quality was constructed. The results showed that the comprehensive environmental quality of the area was good, with an excellent and good rate of 81.67% The results show that the shallow groundwater in Class IV and V occupies 17.06% of the total groundwater, mainly including TDS, Cl-, NO3-, NO2- and NH4 +. The analysis shows that it is related to seawater intrusion, agricultural production, industrial and domestic sewage discharge.