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A Phenomenological Model for Particle Retention in Single, Saturated Fractures

机译：单个饱和骨折中颗粒保留的现象学模型

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摘要

Fractured aquifers are some of the most poorly characterized subsurface environments despite posing one of the highest risks to the protection of potable groundwater. This research was designed to improve the understanding of the factors affecting particle transport through fractures by developing a phenomenological model based on laboratory-scale transport data. The model presented in this research employed data from over 70 particle tracer tests conducted in single, saturated, variable-aperture fractures that were obtained from the natural environment and fractured in the laboratory or cast from epoxy in the laboratory. The particles employed were Escherichia coli RS2-GFP and microspheres. The tracer experiments were conducted in natural (dolomitic limestone and granite) as well as epoxy replicas of the natural fractures. The multiple linear regression analysis revealed that the most important factors influencing particle retention in fractures are the ratio of the ionic strength of solution to collector charge, the ratio of particle to collector charge, and the ratio of advective to diffusive forces as described by the Peclet number. The model was able to reasonably (R~2 =0.64) predict the fraction of particles retained; however, it is evident that some factors not accounted for in the model also contributed to retention. This research presents a novel approach to understanding particle transport in fractures, and illustrates the relative importance of various factors affecting the transport mechanisms. The utility of this model lies in the increased understanding of particle transport in fractures, which is extremely useful for directing future research.
机译：破裂的含水层是某些特征最差的地下环境，尽管对饮用水的保护构成最高的风险之一。这项研究旨在通过基于实验室规模的传输数据开发一种现象学模型来增进对影响颗粒通过裂缝传输的因素的理解。本研究中提出的模型采用了70多个粒子示踪剂测试数据，这些测试是在自然环境中获得的，在实验室中破裂或在实验室中由环氧树脂浇铸的单个，饱和，可变孔径裂缝中进行的。使用的颗粒是大肠杆菌RS2-GFP和微球。示踪剂实验是在天然裂缝（白云岩石灰岩和花岗岩）以及环氧裂缝中进行的。多元线性回归分析显示，影响裂缝中颗粒保留的最重要因素是溶液的离子强度与集电体电荷的比率，颗粒与集电体电荷的比率以及对流力与扩散力的比率，如Peclet所述。数。该模型能够合理地（R〜2 = 0.64）预测保留颗粒的比例；但是，很明显，模型中未考虑的一些因素也有助于保留。这项研究提出了一种新颖的方法来理解裂缝中的颗粒传输，并说明了影响传输机理的各种因素的相对重要性。该模型的实用性在于对裂缝中颗粒传输的更多了解，这对于指导未来的研究非常有用。

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  • 来源
    《Ground water》 |2014年第2期|277-283|共7页
  • 作者

    Sandrina Rodrigues; Sarah Dickson;

  • 作者单位

    McMaster University, 1280 Main St.W., Hamilton, ON L8S 4L7, Canada;

    McMaster University, 1280 Main St. W., Hamilton, ON L8S 4L7, Canada;

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  • 正文语种 eng
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