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首页> 外文期刊>Ground water >Comparing Discrete Fracture and Continuum Models to Predict Contaminant Transport in Fractured Porous Media
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Comparing Discrete Fracture and Continuum Models to Predict Contaminant Transport in Fractured Porous Media

机译：比较离散断裂和连续模型以预测污染物在多孔介质中的迁移

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摘要

We used the FRAC3Dvs numerical model (Therrien and Sudicky 1996) to compare the dual-porosity (DP), equivalent porous medium (EPM), and discrete fracture matrix diffusion (DFMD) conceptual models to predict field-scale contaminant transport in a fractured clayey till aquitard. The simulations show that the DP, EPM, and DFMD models could be equally well calibrated to reproduce contaminant breakthrough in the till aquitard for a base case. In contrast, when groundwater velocity and degradation rates are modified with respect to the base case, the DP method simulated contaminant concentrations up to three orders of magnitude different from those calculated by the DFMD model. In previous simulations of well-characterized column experiments, the DFMD method reproduced observed changes in solute transport for a range of flow and transport conditions comparable to those of the field-scale simulations, while the DP and EPM models required extensive recalibration to avoid high magnitude errors in predicted mass transport. The lack of robustness with respect to variable flow and transport conditions suggests that DP models and effective porosity EPM models have limitations for predicting cause-effect relationships in environmental planning. The study underlines the importance of obtaining well-characterized experimental data for further studies and evaluation of model key process descriptions and model suitability.
机译：我们使用FRAC3Dvs数值模型（Therrien和Sudicky 1996）比较双孔隙度（DP），等效多孔介质（EPM）和离散裂缝基质扩散（DFMD）概念模型，以预测裂缝性黏土中的现场污染物迁移直到阿基亚德。仿真显示，可以对DP，EPM和DFMD模型进行同样良好的校准，以在基本情况下重现在耕a机中的污染物突破。相反，当相对于基本情况修改了地下水速度和降解速率时，DP方法模拟的污染物浓度与DFMD模型所计算的污染物浓度最多相差三个数量级。在以前的性能良好的色谱柱实验模拟中，DFMD方法再现了在一定范围内与田间规模模拟相当的流速和输送条件下溶质运移的观察变化，而DP和EPM模型则需要进行大量重新校准以避免高强度预测的大众运输中的错误。对于可变的流动和运输条件缺乏鲁棒性表明，DP模型和有效孔隙率EPM模型在预测环境规划中的因果关系方面存在局限性。这项研究强调了获得表征良好的实验数据对于进一步研究和评估模型关键过程描述和模型适用性的重要性。

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  • 来源
    《Ground water》 |2014年第1期|84-95|共12页
  • 作者

    Daniela Blessent; Peter R. Jorgensen; Rene Therrien;

  • 作者单位

    Departement de Geologie et de Genie Geologique, Universite Laval, 1065 Avenue de la Medecine, Quebec, QC G1V0A6, Canada,Currently at Department of Civil, Geological and Mining Engineering, Ecole Polytechnique, Montreal, C.P. 6079 succ. Centre-ville, Montreal, Quebec, QC Canada H3C 3A7 PJ-Bluetech ApS, Klintebakken 9, DK-3520, Denmark;

    Departement de Geologie et de Genie;

    Geologique, Universite Laval, 1065 Avenue de la Medecine, Quebec,QC G1V 0A6, Canada;

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