摘要
珠江河口区沿海冲积平原水动力条件差,随着几次海进海退的过程,地下储藏着大量的咸水。本文以广州南部地区地下水盐分为研究对象,以物探技术为主要方法,结合地下水TDS空间分布以及14C,分析地下水盐分的变异特征,并探讨了地下水盐分的来源以及珠江河口区地下水循环过程。结果表明:地下水盐分由研究区东部和西部向内陆减少,由北部向南部逐渐增高;地下水溶解性总固体(TDS)超过1 g/L的咸水分布面积约占研究区的75%;研究区地下水流场可分为两个子系统,南部受到海水入侵影响,地下咸水水力交换较差,北部咸水受到地表淡水和浅层地下水的补给后出现淡化现象。
With the processes of ancient sea transgressions,a large amount of salt water has been stored in the subsurface of the Pearl River estuary due to its low hydraulic conductivities in the coastal alluvial plain area. In this paper, we analyze the spatial variation and the source of groundwater salinity,and discuss the process of groundwater circulation in the Pearl River estuary area,using geophysical prospecting technology,total dissolved solid (TDS) and 14 C data. The results of geophysical prospecting show that the groundwater salinity decreases from the east and the west of riverside to the inland,and gradually increase from the north to the south of seaside. The salt water is distributed around 75% of the study area where TDS exceeds 1g/L. The groundwater flow field could be divided into two subsystems. The groundwater flow system in the north is desalinated by receiving surface freshwater and shallow groundwater recharge,while the system in the south is affected by the seawater intrusion and the hydraulic exchange of the subsurface salt water is poor.
作者
覃光雄
胡晓农
张晓影
郝艳茹
李丹
陈琨
QIN Guang-xiong;HU Xiao-nong;ZHANG Xiao-ying;HAO Yan-ru;LI Dan;CHEN Kun(Jinan University,Guangzhou 510220,China;Institude of Water Science Guangzhou,Guangzhou 510220,China;Sewage Treat- ment Project Management Office of Guangzhou,Guangzhou 510220,China)
出处
《海洋环境科学》
CAS
CSCD
北大核心
2018年第6期835-842,共8页
Marine Environmental Science
基金
广州市水务科技项目"广州咸水入侵区地下水循环及"三水"转化规律研究"(PSZX-XSRQDXS-201601)
广州市水务科技项目"广州市地下水应急备用水源地评价研究-以广花盆地为例"(2016-203)
广东省自然科学基金(2017A030310172)
重庆岩溶环境重点实验室开放基金(Cqk 201702)
关键词
盐分
空间变异
珠江河口区
概念模型
salinity
spatial variation
Pearl River estuary
conceptual model
