摘要
为研究赣南红层地区地下水资源及保障区域供水安全,基于水文地球化学理论,运用数理统计、Pipper三线图、Gibbs模型、水化学平衡法、同位素示踪法和离子比例系数法等方法,分析了研究区地下水水化学特征及主要离子来源。结果表明:研究区地下水水化学类型以HCO_(3)-Ca、HCO_(3)-Ca·Na为主,主要阳离子和阴离子分别为Ca^(2+)和HCO_(3)^(-);氢氧同位素特征显示研究区地下水起源于大气降水,Sr同位素主要来源于硅酸盐岩和碳酸盐岩风化的混合。地下水中石膏、岩盐、白云石、方解石和硅酸盐岩均处于未饱和状态。影响研究区地下水离子组成的是硅酸盐岩和碳酸盐岩的风化溶解作用,碳酸盐岩风化溶解控制区以方解石溶解为主。地下水在径流过程中存在阳离子交换作用,阳离子交换以地下水中的Ca^(2+)、Mg 2+置换围岩矿物的Na+、K+为主,人类活动对地下水离子组成的影响较小,其中工矿活动的影响大于农业活动和生活污水排放。
In order to study the groundwater resources and ensure the safety of regional water supply in red-bed area of south Jiangxi Province,based on hydrologic geochemistry theory,methods such as mathematical statistics,Piper diagram,Gibbs model,hydrochemical equilibrium,isotope tracing and ion ratio were used to analyze the hydrochemical characteristics and main ion sources of groundwater in the study area.The results show that the chemical type of study area is mainly HCO_(3)-Ca,HCO_(3)-Ca·Na,the main cations and anion are Ca^(2+)and HCO_(3)^(-).The characteristics of hydrogen and oxygen isotopes indicate that the groundwater in the study area originates from the precipitation,Sr isotopes are mainly derived from the weathering mixing of silicate and carbonate rocks.Gypsum,rock salt,dolomite,calcite and silicate in groundwater are in an unsaturated state.The weathering and dissolution of silicate rock and carbonate rock are the main factor on the ion composition of groundwater in the study area,calcite dissolution is dominant in the weathering and dissolution control area of carbonate rocks.Groundwater run-off process exist cation exchange,the cation exchange mainly involves Ca^(2+)and Mg 2+in groundwater replacing Na+and K+in surrounding rock minerals,the influence of human activities on the ion composition of groundwater is small,and the influence of industrial and mining activities is greater than that of agricultural activities and domestic sewage discharge.
作者
赵幸悦子
肖攀
宋文龙
黎义勇
刘前进
ZHAO Xing-yue-zi;XIAO Pan;SONG Wen-long;LI Yi-yong;LIU Qian-jin(Wuhan Center of China Geological Survey,Wuhan 430205,China;Hainan 934 Geological Brigade,Haikou 570206,China;Basic Geological Survey Institute,Jiangxi Geological Survey Institute,Nanchang 330201,China)
出处
《科学技术与工程》
北大核心
2023年第33期14112-14122,共11页
Science Technology and Engineering
基金
赣江流域水文地质调查项目(DD20190329)。
关键词
赣南红层
地下水
水化学特征
成因分析
red-bed area of south Jiangxi Province
groundwater
hydrochemical characteristics
genetic analysis
