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考虑污染物扩散风险的场地地下水污染多层次风险评估方法研究

张行洲 殷乐宜 陈坚 周笑笑 杨丽虎 吴吉春 谢月清

张行洲,殷乐宜,陈坚,等. 考虑污染物扩散风险的场地地下水污染多层次风险评估方法研究[J]. 水文地质工程地质,2023,50(0): 1-11 doi:  10.16030/j.cnki.issn.1000-3665.202209006
引用本文: 张行洲,殷乐宜,陈坚,等. 考虑污染物扩散风险的场地地下水污染多层次风险评估方法研究[J]. 水文地质工程地质,2023,50(0): 1-11 doi:  10.16030/j.cnki.issn.1000-3665.202209006
ZHANG Xingzhou, YIN Leyi, CHEN Jian, et al. A study of the multi-tiered risk assessment method of site groundwater contamination considering transport-induced risk[J]. Hydrogeology & Engineering Geology, 2023, 50(0): 1-11 doi:  10.16030/j.cnki.issn.1000-3665.202209006
Citation: ZHANG Xingzhou, YIN Leyi, CHEN Jian, et al. A study of the multi-tiered risk assessment method of site groundwater contamination considering transport-induced risk[J]. Hydrogeology & Engineering Geology, 2023, 50(0): 1-11 doi:  10.16030/j.cnki.issn.1000-3665.202209006

考虑污染物扩散风险的场地地下水污染多层次风险评估方法研究

doi: 10.16030/j.cnki.issn.1000-3665.202209006
基金项目: 国家重点研发课题(2019YFC1804803)
详细信息
    作者简介:

    张行洲(1999-),男,硕士研究生,主要从事场地地下水风险评估研究。E-mail: 13132203635@163.com

    通讯作者:

    谢月清(1983-),男,教授,主要从事地表水与地下水相互作用研究。E-mail: yxie@nju.edu.cn

  • 中图分类号: P641.2

A study of the multi-tiered risk assessment method of site groundwater contamination considering transport-induced risk

  • 摘要: 地下水中污染物具有迁移性和扩散性,会对下游敏感受体造成威胁,目前场地地下水风险评估主要关注人体健康风险,还未能综合考虑地下水污染的整体风险,尤其是忽视了污染物迁移引起的对下游敏感受体的风险。本研究基于“源-径-汇”模型构建了考虑污染物扩散风险的场地地下水污染风险评估的指标体系与风险评估模式。在指标体系构建方面,重点考虑场地地下水的污染源、迁移路径和敏感受体3个方面。在风险评估模式方面,根据场地不同地下水污染状态开展3个层次的风险评估。基于假想的铬污染场地开展了案例分析,设置了地下水污染状态的4种情景,利用Wexler溶质运移模型计算了地下水污染羽的时空变化,并针对地下水污染的不同层次开展了风险评估。结果表明,在场地地下水污染羽未到达场地边界的2种情形中,场地地下水的风险评分分别为4,6.4,分别属于低风险与中风险。在场地地下水污染羽到达或超出场地边界的2种情形中,场地地下水的风险评分分别为7.0,8.8,分别属于中风险与高风险。综合而言,本研究构建的方法能够用来对场地地下水进行系统全面的评估和对比,能够根据风险结果对污染场地进行有效的分级管控,为污染场地的风险管控提供技术支撑。
  • 图  1  场地地下水污染多层次风险评估框架

    Figure  1.  Multi-level risk assessment framework for groundwater contamination of the site

    图  2  情形2解析解污染物分布结果

    Figure  2.  Analytical solution result of contamination distribution of case 2

    图  3  解析解污染物分布结果

    Figure  3.  Analytical solution result of contamination distribution

    图  4  情形2解析解风险评估结果

    Figure  4.  Analytical solution results of risk assessment of case 2

    图  5  情形3解析解风险评估结果

    Figure  5.  Analytical solution results of risk assessment of case 3

    图  6  情形4解析解风险评估结果

    Figure  6.  Analytical solution results of risk assessment of case 4

    表  1  指标分级评分

    Table  1.   Index grading table

    土壤污染物入渗浓度土壤污染范围地下水质量健康风险敏感受体类型或
    使用功能类型
    迁移至敏感受体
    的天数/d
    迁移速度
    /(m·d-1
    赋值
    符合IV类水水质目标≤5%符合水质目标CR<10−6HQ<1其他类型或没有敏感受体T≥1000v<0.32
    超IV类水质目标≤5倍≤10%超水质目标≤5倍10−6<CR≤5×10−6
    1≤HQ<5
    建设用地500<T<10000.3≤v<14
    超IV类水质目标≤20倍≤25%超水质目标≤20倍5×10−6<CR≤10−5
    5≤HQ<10
    居住用地250<T<5001≤v<26
    超IV类水质目标≤50倍≤50%超水质目标≤50倍10−5<CR≤10−4
    10≤HQ<100
    工农业用水100<T<2502≤v<58
    超IV类水质目标>50倍>50%超水质目标>50倍CR≥10−4
    HQ≥100
    水源地和敏感地表水体T≤100v≥510
    下载: 导出CSV

    表  2  多层次风险评估模式

    Table  2.   Multi-level risk assessment model

    指标层次地下水含水层污染特征指标组合
    第一层次未污染(场地土壤已污染)
    第二层次已污染,范围未超场界源、径、汇
    第三层次已污染,范围已超场界源、径、汇
    下载: 导出CSV
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  • 收稿日期:  2022-09-02
  • 修回日期:  2022-11-07

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