苏州吴江区浅层地下水化学特征及成因分析  

Hydrochemical and genetic analysis of shallow groundwater in Wujiang District,Suzhou

作　　者：杨露梅[1,2] 武鑫 许书刚[1,2] 邝荣禧 朱常坤[1,2] YANG Lumei;WU Xin;XU Shugang;KUANG Rongxi;ZHU Changkun(Geological Survey of Jiangsu Province,Nanjing,210049;Key Laboratory of Earth Fissure Geological Disaster,Ministry of Natural Resources,Nanjing,210049)

机构地区：[1]江苏省地质调查研究院,南京210049 [2]自然资源部地裂缝地质灾害重点实验室,南京210049

出　　处：《地质论评》2025年第2期537-547,I0001,I0002,共13页Geological Review

基　　金：江苏省地质勘查基金项目“长三角生态绿色一体化发展示范区(江苏)生态地质调查(编号:苏财建[2021]46号)”;“苏南现代化建设示范区综合地质调查(编号:苏财建[2016]140号)”;“江苏省典型生态功能区主要生态地质问题调查与安全评价(编号:苏财资环[2024]33号)”的成果。

摘　　要：水生态保护是长三角生态绿色一体化发展示范区的重要任务,浅层地下水是水生态体系的有机组成部分。为了明晰该区域浅层地下水的化学特征及其成因机制,本研究综合运用统计分析、Gibbs图、Piper三线图、相关性分析以及主成分(因子)分析等多种方法,系统地分析了长三角生态绿色一体化发展示范区—苏州市吴江区的水文地球化学过程。结果表明,研究区浅层地下水处于偏碱性环境,阴离子主要以HCO_(3)^(-)为主,阳离子以Na^(+)和Ca^(2+)为主,微承压水大部分属于微咸水和咸水,且微承压水中的NH_(4)^(+)含量高于潜水中NH_(4)^(+)含量;相关分析表明,地下水中的大多数主要离子主要受自然过程的调控,高浓度的Na^(+)、Mg^(2+)、NH_(4)^(+)有利于I-在地下水中的富集;因子分析中提取的4个因子解释了总方差的85.375%,并分别与盐度、有机物、酸碱度和硫酸盐有关,总体来说,盐度、酸碱度和硫酸盐与自然过程有关,因子2代表了人为过程,而人为过程和自然过程不能完全分开。Water ecological protection is an important task for demonstration zone of green and integrated ecological Development of the Yangtze River Delta.Shallow groundwater is an organic part of the water ecological system.To clarify the chemical characteristics and genetic mechanisms of shallow groundwater in this region,this study systematically analyzed the hydrogeochemical processes by using a variety of methods such as statistical analysis,Gibbs diagrams,Piper threeline diagrams,correlation analysis,and principal component(factor)analysis.The results showed that the shallow groundwater is slightly alkaline water,with HCO_(3)^(-) as the main anion,and Na^(+)and Ca^(2+)as the main cation.Most of the microconfined groundwater belongs to brackish water and saltwater,which with higher NH_(4)^(+)content than phreatic water.Correlation analysis indicated that most of the major ions in the groundwater are mainly regulated by natural processes.High concentrations of Na^(+),Mg^(2+),and NH_(4)^(+)are conducive to the accumulation of I-in groundwater.Four factors extracted from factor analysis explain 85.375%of the total variance and are related to salinity,organic matter,pH,and sulfate,respectively.Overall,salinity,pH,and sulfate are related to natural processes,and Factor 2 represents anthropogenic processes,which cannot be completely separated from natural processes.

关 键 词：示范区 水化学特征 相关性分析 因子分析 苏州 长三角 

分 类 号：P64[天文地球—地质矿产勘探]