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基金项目:江苏省地质勘查专项资金项目“南通市海门区地质环境综合调查”(苏财资环[2020]20号)
作者单位
张建忙,范冠宇,王琦,等  
摘要:
      为系统掌握南通海门区浅层地下水水化学现状,在采集区域地下水样本并分析水化学特征的基础上,综合运用描述性统计、相关性分析、Piper三线图、Gibbs模型以及离子比例系数法等分析手段,对南通海门区浅层地下水化学特征及其形成机理进行系统分析。结果表明:HCO3-和Ca2+分别是研究区浅层地下水中占比最大的阴、阳离子;HCO3-Ca和HCO3-Ca·Mg型为该地区主要地下水化学类型;浅层地下水TDS和总硬度的平均质量浓度相对较低,平均值分别为598.00、374.32 mg/L。根据相关性分析,Cl-和Mg2+为影响该区域地下水TDS的特征因子。研究区浅层地下水化学特征主要受到岩石风化作用影响,地下水水质成分主要源自碳酸盐岩和硅酸盐岩等的长期风化溶解。同时,逆向阳离子交换作用也在一定程度上影响着浅层地下水化学的组成。研究结果可为该区地下水开发利用管理提供理论依据和数据支撑。
关键词:浅层地下水  水化学特征  演化机制  南通海门
Abstract:
      To systematically grasp the hydrochemical status of shallow groundwater in Haimen District, Nantong City, this paper comprehensively analyzes the hydrochemical characteristics and formation mechanism of the shallow groundwater in Haimen District of Nantong by means of descriptive statistics, correlation analysis, Piper three-line graph, Gibbs model and ion proportion coefficient, based on the collection of regional groundwater samples and the analysis of their hydrochemical characteristics. The results show that HCO3- and Ca2+ are the dominant anions and cations in the shallow groundwater in the study area, respectively. HCO3-Ca and HCO3-Ca·Mg are the main groundwater chemical types in this area. The average mass concentrations of TDS and total hardness of shallow groundwater are relatively low, with average values of 598.00, 374.32 mg/L respectively. According to the correlation analysis, Cl- and Mg2+ are the characteristic factors affecting the TDS of groundwater in this area. The chemical characteristics of shallow groundwater in the study area are mainly affected by rock weathering. The water quality of groundwater is mainly from the long-term weathering and dissolution of materials such as carbonate rocks and silicate rocks. Meanwhile, the reverse cation exchange also affects the formation of shallow groundwater chemistry to a certain extent. The research results can provide theoretical basis and data support for the green development of groundwater in this region.
Keywords:shallow groundwater  hydrochemical characteristic  evolution mechanism  Haimen District in Nantong
张建忙,范冠宇,王琦,等.南通海门浅层地下水水化学特征及演化机制[J].地质学刊,2023,47(3):322-329