山东省巨野县浅层地下水咸化特征及成因

Characteristics and Causes of Shallow Groundwater Salinization in Juye County,Shandong Province

为了深入了解浅层地下水的水化学特征及形成原因,在山东省巨野县采集20组浅层地下水样品,采用数理统计、Durov图、主成分分析、离子比值以及矿物饱和指数等方法,对地下水样检测结果进行统计分析,研究该地区地下水咸化特征及产生机制。结果表明:研究区浅层地下水总体呈弱碱性,溶解性总固体的质量浓度为1680~14000 mg/L,地下水化学类型主要分为SO_(4)·Cl-Na·Mg、HCO_(3)·SO_(4)·Cl-Na·Ca·Mg、HCO_(3)·SO_(4)-Na·Mg以及HCO_(3)·SO_(4)·Cl-Na·Mg型;浅层地下水的咸化程度主要受蒸发浓缩作用影响,水中离子主要来自硅酸盐、岩盐矿物的溶解,钾盐、石膏、岩盐、硬石膏是溶解性总固体的主要来源,造成研究区地下水咸化的最主要矿物是钾盐、岩盐。

To gain a deeper understanding of the hydrochemical characteristics and causes of shallow groundwater formation,20 groups of shallow groundwater samples were collected in Juye County,Shandong Province,and the test results of the groundwater samples were statistically analyzed by methods such as mathematical statistics,Durov diagram,principal component analysis,ion ratio and mineral saturation index,so as to study the characteristics and generation mechanism of groundwater salinization.The results show that the shallow groundwater in the study area is generally weakly alkaline,and the mass concentration of total dissolved solids is 1680~14000 mg/L.The chemical types of groundwater are mainly divided into SO_(4)·Cl-Na·Mg,HCO_(3)·SO_(4)·Cl-Na·Ca·Mg,HCO_(3)·SO_(4)-Na·Mg and HCO_(3)·SO_(4)·Cl-Na·Mg.The salinity degree of shallow groundwater is mainly affected by evaporation and concentration.The ions in water mainly come from the dissolution of silicate and rock salt minerals,and potassium salt,gypsum,rock salt and anhydrite are the main sources of total dissolved solids.The main minerals that cause groundwater salinization in the study area are potassium salt and rock salt.