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    刘学浩, 邹金, 易秤云, 王平, 王磊, 李江山, 龙思杰, 黄长生. 基于地下水分层技术刻画污染场地水化学空间分布特征——以湖北某垃圾填埋场为例[J]. 中国地质. DOI: 10.12029/gc20230209001
    引用本文: 刘学浩, 邹金, 易秤云, 王平, 王磊, 李江山, 龙思杰, 黄长生. 基于地下水分层技术刻画污染场地水化学空间分布特征——以湖北某垃圾填埋场为例[J]. 中国地质. DOI: 10.12029/gc20230209001
    LIU Xuehao, ZOU Jin, YI Chenyun, WANG Ping, WANG Lei, LI Jiangshan, LONG Sijie, HUANG Changsheng. Spatial distribution characteristics of hydrochemistry in contaminated sites based on groundwater stratification technology: a case study of a landfill in Hubei Province[J]. GEOLOGY IN CHINA. DOI: 10.12029/gc20230209001
    Citation: LIU Xuehao, ZOU Jin, YI Chenyun, WANG Ping, WANG Lei, LI Jiangshan, LONG Sijie, HUANG Changsheng. Spatial distribution characteristics of hydrochemistry in contaminated sites based on groundwater stratification technology: a case study of a landfill in Hubei Province[J]. GEOLOGY IN CHINA. DOI: 10.12029/gc20230209001

    基于地下水分层技术刻画污染场地水化学空间分布特征——以湖北某垃圾填埋场为例

    Spatial distribution characteristics of hydrochemistry in contaminated sites based on groundwater stratification technology: a case study of a landfill in Hubei Province

    • 摘要:研究目的】垃圾填埋场渗滤液渗漏对周边土壤和地下水造成持久性环境污染,而对地下水污染羽空间分布的刻画表征是场地污染调查与修复的关键。【研究方法】以湖北某垃圾填埋场为研究对象,基于地下水U型管分层采样监测技术实施一孔六层地下水分层监测(-6m、-8m、-10m、-12m、-16m、-20m) ,结合场地水文地质调查及14个地下水样水质数据,研究地下水化学组分沿地层深度的空间分布特征。【研究结果】结果显示,地下水中TDS、COD(Mn)、Mg2+、HCO3-、Cl-等主要离子浓度随垂向地层深度线性减小,表明地表入渗及人为活动污染是垃圾填埋场浅层地下水化学组分的主控影响因素; NH4+、NO3-、NO2-、Mn、Ni等部分离子浓度随垂向地层深度线性增大,反映了自然地质条件及水岩相互作用下地下水化学场的空间特征。相关系数矩阵分析显示,地下水分层监测井水化学组分随地层深度加大,与常规地下水监测井的相关性系数由0.984减小至0.566,表征了地下水化学组分的空间分层分布特征。【结论】研究表明,地下水分层采样监测技术刻画了地下水化学组分沿地层垂向深度的空间分布特征,一定程度区分揭示自然地质成因与人为活动污染的影响,进而识别刻画地下水污染羽的空间分布,精准指导场地尺度地下水污染修复与风险管控。

       

      Abstract: Objective The leakage of leachate from a landfill can cause severe groundwater contaminations. Characterization the spatial distribution of the landfill-derived contamination plume is crucial for site remediation and pollution investigation. Methods In this paper, a typical case of groundwater pollution investigation at a landfill in Hubei is combined with the implementation of a six-layer groundwater multilevel sampling well (-6 m、-8 m、-10 m、-12 m、-16 m、-20 m), and 14 sets of groundwater chemical samples as well as other hydrogeological survey data to reveal the hydrogeochemical spatial distribution of the contaminated groundwater. Results The results indicate that the concentrations of most ions in groundwater such as TDS, COD (Mn), Mg2+, HCO3- and Cl- decrease linearly with increasing vertical depth, thus indicating that surface rainfall infiltration and anthropogenic pollution are the controlling influences on the shallow groundwater. The concentration of NH4+, NO3-, NO2-, Mn, Ni and other ions increases linearly with increasing vertical depth, reflecting groundwater chemical field under the control of natural geological condition and water-rock interaction. In addition, the correlation coefficient matrix analysis characterises the stratified distribution of groundwater chemical components, the correlation coefficient between the groundwater sample from the U-tube groundwater multilevel sampling well and other conventional shallow boreholes decreases from 0.984 to 0.566.ConclusionsThe conclusion indicates that the novel groundwater multilevel sampling technology has the ability, to characterize the hydrogeochemical spatial distribution of groundwater along the vertical depth of the geological layers, to differentiate and reveal the impacts of natural geological factors and human-made pollution, thus to identify the spatial distribution of groundwater plumes. In a word, the groundwater multilevel sampling technology could provide quantities' data and accurate guidance for site-scale groundwater pollution remediation and risk management.

       

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