长三角地区环境水文地质特征及其对重金属污染物迁移的影响  

Study on environmental hydrogeological characteristics of the Yangtze River Delta and their impact on the transport of heavy metal contaminants

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作  者:王蓉 梁雨蕾 陈忠清 WANG Rong;LIANG Yulei;CHEN Zhongqing(SGIDI Engineering Consulting(Group)Co,Ltd.,Shanghai 200093,China;Shanghai Engineering Research Center of Geo-Environment,Shanghai 200093,China;School of Civil Engineering,Shaoxing University,Zhejiang Shaoxing 312000,China)

机构地区:[1]上海勘察设计研究院(集团)股份有限公司,上海200093 [2]上海环境岩土工程技术研究中心,上海200093 [3]绍兴文理学院土木工程学院,浙江绍兴312000

出  处:《上海国土资源》2024年第2期48-52,共5页Shanghai Land & Resources

基  金:国家重点研发计划项目子课题“重点区域场地土壤—地下系统重金属空间分布及其与介质组成关系”(2018YFC1800601)。

摘  要:基于大量勘察资料和文献调研,对长三角典型水文地质特征及地层分布特征进行了分析,在此基础上对长三角土壤—地下水系统典型地层组合进行归纳总结,并分析其对重金属污染迁移的影响。研究结果表明:长三角的环境水文地质分区以平原区为主,面积占比达49.2%,地下水类型以孔隙水为主,其次为以基岩裂隙水为主的低山—丘陵区,面积占比为36.2%,而以孔隙裂隙水及孔隙岩溶水为主的丘陵平原区的面积占比为14.6%。典型地层组合可概化为4类,其中:组合A中饱和带以高渗透性土层为主,对流弥散作用强,土壤吸附能力弱,重金属易随地下水流动迁移;组合B中饱和带高/低渗透性土层交互,重金属易在高渗透性土层中迁移,不易在低渗透性土层中迁移;组合C中饱和带以低渗透性土层为主,对流弥散作用较弱,重金属易被土壤吸附,不易迁移;组合D中饱和带以破碎基岩为主,且基岩埋藏较浅,重金属迁移与包气带厚度及介质类型和基岩岩性及破碎程度等因素有关。研究结果可为长三角土壤重金属污染防治提供一定的理论依据。Based on a large amount of survey data and literature research,the typical hydrogeological characteristics and stratigraphic distribution characteristics of the Yangtze River Delta were analyzed.The typical stratigraphic combinations of the soil groundwater system in the Yangtze River Delta were then summarized and their impact on the transport of heavy metal contaminants was analyzed.The research results show that the environmental hydrogeological zoning of the Yangtze River Delta is mainly composed of plain areas,low mountain hilly areas and hilly plain areas,accounting for 49.2%,36.2%and 14.6%of the area,respectively.Different types of groundwater are mainly distributed in these areas,which are pore water,bedrock fissure water and pore fissure water together with pore karst water,respectively.Typical stratigraphic combinations can be summarized into four categories.The saturated zone in Combination A is mainly composed of high permeability soil layers,with strong convection and dispersion effects,weak soil adsorption capacity,and easy transport of heavy metals with groundwater flow.In combination B,there is interaction between high and low permeability soil layers in the saturated zone,and heavy metals are easy to transport in high permeability soil layers and not easy to transport in low permeability soil layers.In combination C,the saturated zone is mainly composed of low permeability soil layers,with weak convection and dispersion effects.Heavy metals are easily adsorbed by the soil and are not easy to transport.In combination D,the saturated zone is mainly composed of fractured bedrock,and the bedrock is buried shallowly.The transport of heavy metals is related to factors such as the thickness of the gas bearing zone,the type of medium,and the lithology and degree of fragmentation of the bedrock.The research results can provide a certain theoretical basis for the prevention and control of heavy metal contaminant in soil in the Yangtze River Delta.

关 键 词:长三角地区 重金属污染土 环境水文地质分区 地层组合 污染迁移 

分 类 号:P641.69[天文地球—地质矿产勘探]

 

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