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Specification of Matrix Cleanup Goals in Fractured Porous Media

机译：破裂多孔介质中基质净化目标的规范

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摘要

Semianalytical transient solutions have been developed to evaluate what level of fractured porous media (e.g., bedrock or clay) matrix cleanup must be achieved in order to achieve compliance of fracture pore water concentrations within a specified time at specified locations of interest. The developed mathematical solutions account for forward and backward diffusion in a fractured porous medium where the initial condition comprises a spatially uniform, nonzero matrix concentration throughout the domain. Illustrative simulations incorporating the properties of mudstone fractured bedrock demonstrate that the time required to reach a desired fracture pore water concentration is a function of the distance between the point of compliance and the upgradient face of the domain where clean groundwater is inflowing. Shorter distances correspond to reduced times required to reach compliance, implying that shorter treatment zones will respond more favorably to remediation than longer treatment zones in which back-diffusion dominates the fracture pore water response. For a specified matrix cleanup goal, compliance of fracture pore water concentrations will be reached sooner for decreased fracture spacing, increased fracture aperture, higher matrix fraction organic carbon, lower matrix porosity, shorter aqueous phase decay half-life, and a higher hydraulic gradient. The parameters dominating the response of the system can be measured using standard field and laboratory techniques.
机译：已经开发了半分析瞬态解决方案，以评估必须达到何种水平的压裂多孔介质（例如，基岩或粘土）基质净化，以便在指定时间内在指定的目标位置达到压裂孔隙水浓度的标准。所开发的数学解决方案解释了裂隙多孔介质中的向前和向后扩散，其中初始条件包括整个域中空间均匀，非零的基质浓度。包含泥岩裂隙基岩特性的说明性模拟表明，达到所需裂隙孔隙水浓度所需的时间是顺应点与流入清洁地下水的区域的上升面之间的距离的函数。较短的距离对应于减少达到顺应性所需的时间，这意味着较短的处理区比起较长的处理区（其中反向扩散在裂缝孔隙水响应中占主导地位）将对修复有更好的响应。对于指定的基质净化目标，将更快地达到裂缝孔隙水浓度的要求，以减小裂缝间距，增加裂缝孔径，提高基质分数有机碳，降低基质孔隙度，缩短水相衰减半衰期以及提高水力梯度。可以使用标准现场和实验室技术来测量控制系统响应的参数。

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  • 来源
    《Ground water》 |2013年第1期|58-65|共8页
  • 作者

    David J. Rodriguez; Bernard H. Kueper;

  • 作者单位

    Department of Civil Engineering,Queen's University, Ellis Hall, Kingston, ON, Canada K7L 3N6;

    Department of Civil Engineering, Queen's University, Ellis Hall, Kingston, ON, Canada K7L 3N6;

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