钱塘江下游滨江地区地下水水化学特征与水质评价  

Hydrochemical characteristics and water quality evaluation of groundwater in lower reaches of the Qiantang River

作　　者：蔡小虎[1] 康丛轩[1] CAI Xiaohu;KANG Congxuan(Nanjing Center,China Geological Survey,Nanjing 210016,China)

机构地区：[1]中国地质调查局南京地质调查中心,江苏南京210016

出　　处：《人民长江》2023年第6期27-33,共7页Yangtze River

基　　金：国家重点研发计划项目“城市地下全要素信息集成与智能建模技术”(2019YFC0605102);中国地质调查局项目“杭州多要素城市地质调查”(DD20190281)。

摘　　要：为探究钱塘江下游滨江地区地下水水化学特征及水质情况,采用数理统计、Piper三线图、Gibbs图、单指标评价法、综合质量评价法和模糊综合评价法,对研究区的46组地下水水样测试数据进行分析。结果表明:研究区内潜水水化学类型主要为HCO_(3)-Na·Ca·Mg型和HCO_(3)·Cl-Na型,水化学成分受岩石风化作用影响显著,主要受到岩盐的溶解、离子交换作用、人类活动影响;承压水水化学类型主要为Cl-Na·Ca·Mg型和Cl-Na型,水化学成分主要受海水作用的影响;研究区内潜水水质总体较好,部分潜水受原生地质环境的污染;承压水污染主要受海侵影响,不宜饮用。研究结果对区内地下水的开发、利用和保护具有积极的指导意义。In order to explore the hydrochemical characteristics and water quality of groundwater in the lower reaches of the Qiantang River,the test data of 46 groundwater samples in this area were analyzed by mathematical statistics,Piper s three-line diagram,Gibbs diagram,single-index evaluation method,comprehensive quality evaluation method and fuzzy comprehensive evaluation method.The results showed that the phreatic water hydrochemical types were HCO_(3)-Na·Ca·Mg and HCO_(3)·Cl-Na respectively,which were mainly affected by dissolution of rock salt,ion exchange,and human activities.The confined water hydrochemical types were Cl-Na·Ca·Mg and Cl-Na,which were mainly affected by seawater.By comparing and analyzing the differences between the evaluation methods,the evaluation results of fuzzy comprehensive evaluation method were more objective for regional groundwater assessment.The results showed that the phreatic water quality in the study area was generally good,and some phreatic water might be polluted by the original geological environment.While the confined water was mainly affected by marine intrusion and was not suitable for drinking.The research has positive guiding significance for the development,utilization and protection of groundwater in the area.

关 键 词：地下水 水化学特征 水质评价 Piper三线图 钱塘江 

分 类 号：X523[环境科学与工程—环境工程]