浙江宁波平原地下水水化学特征及其生态环境效应  

Chemical characteristics and eco-environmental effect of groundwater in Ningbo Plain,Zhejiang Province

作　　者：金阳[1,2,3] 姜月华[1,2,3] 董贤哲 杨国强[2,3] 刘红樱[2,3] 雷长征 周权平 张鸿[2,3] 梅世嘉 杨辉[2,3] 吕劲松 李云 JIN Yang;JIANG Yuehua;DONG Xianzhe;YANG Guoqiang;LIU Hongying;LEI Changzheng;ZHOU Quanping;ZHANG Hong;MEI Shijia;YANG Hui;LÜJinsong;LI Yun(Chinese Academy of Geological Sciences,Beijing 100037,China;Nanjing Center,China Geological Survey,Nanjing 210016,Jiangsu,China;Key Laboratory of Watershed Eco-Geological Processes,Ministry of Natural Resources,Nanjing 210016,Jiangsu,China;Zhejiang Institute of Hydrogeology and Engineering Geology,Ningbo 315012,Zhejiang,China)

机构地区：[1]中国地质科学院,北京100037 [2]中国地质调查局南京地质调查中心,江苏南京210016 [3]自然资源部流域生态地质过程重点实验室,江苏南京210016 [4]浙江省水文地质工程地质大队,浙江宁波315012

出　　处：《中国地质》2022年第5期1527-1542,共16页Geology in China

基　　金：中国地质调查局项目(DD20190260、DD20221728)项目资助。

摘　　要：【研究目的】为查明浙江宁波平原地下水特征及成因演化,促进宁波地区地下水环境优化。【研究方法】在野外调查和取样分析的基础上,充分利用前人资料,综合运用数理统计、相关性分析、Piper三线图、离子比例系数及环境同位素等方法手段,全面系统地分析了宁波平原地下水状况。【研究结果】宁波平原地表水和潜水以淡水为主,Ⅰ承压水和Ⅱ承压水以微咸水、咸水为主,潜水中HCO_(3)^(-)占绝对优势,Cl^(-)、Ca^(2+)、Na^(+)次之,地表水和承压水中Cl^(-)、Na^(+)占主导地位,HCO_(3)^(-)次之。4种水共划分23种水化学类型,地表水和潜水受大气降水影响明显,深层承压水以封存型为主,与浅表水体天然联系不密切,受地质历史时期海侵影响较大。【结论】与20世纪70年代相比,宁波城区Ⅰ承压淡水体分布范围无明显变化,Ⅱ承压水在人类生产生活和水体自然循环双重影响下,原淡水区演化出孤岛状咸水体,但淡水体整体分布范围外扩,面积增加了约12 km^(2),其生态环境效应趋于正向发展。This paper is the result of groundwater geological survey engineering.[Objective]In order to find out the characteristics of groundwater and its reason for evolution in Ningbo plain,and help to optimize the groundwater environment of Ningbo area.[Methods]Groundwater in Ningbo plain was analyzed comprehensively and systemically based on field survey and samples analysis,making full use of the previous data,then multiple methods including the mathematical statistics,the correlation matrices,Piper diagram,the ratio coefficient of main ions and environmental isotope were used for this study.[Results]The main of surface water and phreatic water were fresh water,however,confined water were mainly brackish water or salt water.HCO_(3)^(-)of phreatic water was the predominant anion and Cl^(-),Ca^(2+),Na^(+)were all secondary.Contrastly,the dominant ions of surface water and confined water were Cl^(-)and Na^(+),HCO_(3)^(-)was the second.The four water were divided into twenty-three hydrochemical types,and surfer water and phreatic water were both influenced by precipitation evidently,whereas confined water deeply was closed in the aquifer during previous transgression,so there was little relationship with shallow water.[Conclusions]Compared with that in the 1970s,the distribution of fresh water body in confined aquiferⅠof Ningbo urban area had no significant change,but that in confined aquiferⅡwas changing obviously by the influence of both human activities and natural water recycle.Salt water appeared in the scope of fresh water by hydrochemical evolution,and the scope of fresh water body expanded outside,overall,the distribution area increased by twelve square kilometer approximately,and the environmental effect was being towards positive tendency.

关 键 词：水化学特征 成因演化 同位素 生态环境效应 地下水地质调查工程 宁波 浙江省 

分 类 号：P64112[天文地球—地质矿产勘探] X171.1[天文地球—地质学]