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首页> 外文期刊>Ground water >A Large Undisturbed Column Method to Study Flow and Transport in Macropores and Fractured Media
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A Large Undisturbed Column Method to Study Flow and Transport in Macropores and Fractured Media

机译：研究大孔和破裂介质中流动和传输的大型无扰柱方法

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摘要

Intact soil columns can bridge the gap between field studies and idealized laboratory investigations of flow and transport in macropores and fractured media. However, the value of intact column studies is often hampered by shortcomings such as lack of column intactness, small column size, and column rim flow, which can cause serious artifacts and hamper system understanding. The flexible-wall pressurized large undisturbed column (LUC) method overcomes these limitations and is a valuable approach to analyze fluid flow and solute transport in macroporous and fractured geological formations. The method investigates subsurface processes in complex media, mimicking in situ conditions and facilitating the control of system boundary conditions including effective stress. In recent years, considerable experience has been gained through different applications of the LUC approach. Modeling tools have also been developed for a detailed interpretation of flow and transport processes in LUC systems. This paper describes the steps of the LUC method from column excavation in the field to experimental setup in the laboratory. The description encompasses the key features of the sampling of LUCs in field excavations, the laboratory setup, the procedure for hydraulic and transport experiments, as well as practical challenges and potential issues during operation of an LUC system. Application examples with a fully three-dimensional numerical model of LUC tracer experiments are also presented to illustrate the quantitative interpretation of transport processes in macroporous clayey tills.
机译：完整的土壤柱可以弥合大孔和裂隙介质中流动和运输的野外研究与理想化的实验室研究之间的差距。但是，完整的色谱柱研究的价值通常会受到缺点的困扰，例如缺乏色谱柱完整性，较小的色谱柱尺寸和色谱柱边缘流动，这些都会导致严重的伪影并妨碍系统的理解。柔性壁加压大无扰动色谱柱（LUC）方法克服了这些限制，是分析大孔和破裂地质构造中流体流动和溶质运移的一种有价值的方法。该方法研究了复杂介质中的地下过程，模拟了现场条件，并促进了对包括有效应力在内的系统边界条件的控制。近年来，通过LUC方法的不同应用已经获得了可观的经验。还开发了建模工具，用于详细解释LUC系统中的流动和运输过程。本文描述了LUC方法的步骤，从现场的开挖到实验室的实验设置。该说明涵盖了现场挖掘中的LUC采样的关键特征，实验室设置，水力和运输实验程序以及LUC系统运行过程中的实际挑战和潜在问题。还提供了具有LUC示踪剂实验的全三维数值模型的应用示例，以说明大孔黏土耕作中运输过程的定量解释。

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  • 来源
    《Ground water》 |2019年第6期|951-961|共11页
  • 作者

    Jorgensen Peter R.; Mosthaf Klaus; Rolle Massimo;

  • 作者单位

    GEOZ ApS Klintebakken 9 DK-3520 Farum Denmark;

    Tech Univ Denmark DTU Environm DK-2800 Lyngby Denmark|Geol Survey Denmark & Greenland DK-1350 Copenhagen Denmark;

    Tech Univ Denmark DTU Environm DK-2800 Lyngby Denmark;

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