平阴-东阿水文地质单元岩溶地下水化学特征分析

Analysis on chemical characteristics of karst groundwater in Pingyin-Dong’e hydrogeological unit

为研究平阴-东阿水文地质单元地下水化学特征,采用相关性分析法、因子分析法、聚类分析法等方法对研究区26组岩溶地下水样的10项指标进行了综合分析。结果表明:研究区地下水化学类型以HCO3-Ca·Mg和HCO3-Ca为主;地下水在补给区、径流区和排泄区水化学成分呈现明显的差异性。控制岩溶地下水成分的主要因素是NO3^-,SO4^2-,Na^+和Ca^2+,可以反映样本71.20%的信息量;其中,NO3^-和SO4^2-主要受工矿生产和人类活动的影响,贡献率为31.98%;Na^+主要受人类活动的影响,贡献率为22.65%;Ca^2+主要受灰岩的风化-溶滤作用影响,贡献率为20.17%。

10 indicators of 26 groups of karst groundwater samples in the study area were comprehensively analyzed to study the groundwater chemical characteristics of the Pingyin-Dong’e hydrogeological unit by correlation analysis,factor analysis and cluster analysis.The results showed that the groundwater hydrochemical types in the study area were dominated by HCO3-Ca·Mg and HCO3-Ca.The chemical composition of groundwater in the recharge,runoff and discharge areas showed significant differences.The main factors controlling the composition of karst groundwater were NO3^-,SO4^2-,Na+and Ca^2+,which can reflect 71.20%of the information volume of the sample.NO3^- and SO4^2- were mainly affected by industrial production and human activities,with a contribution rate of 31.98%.Na^+ was mainly affected by human activities,with a contribution rate of 22.65%.Ca^2+ was mainly affected by the weathering-solubility of limestone,and with a contribution rate of 20.17%.