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首页> 外文会议>Transport and reactivity of solutions in confined hydrosystems >Micro-CT Analysis to Explore Salt Precipitation Impact on Porous Media Permeability
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Micro-CT Analysis to Explore Salt Precipitation Impact on Porous Media Permeability

机译：Micro-CT分析，探讨盐析出对多孔介质渗透性的影响

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摘要

The concern for water scarcity as a future reality for a growing proportion of the planet is driving the need to understand in greater detail the role of water in ecosystem sustainability and resiliency. Pertinent to this conversation is the role that salt precipitation and salinization has on soil resources. This paper addresses this task by presenting results of a detailed study on the reduction in gas permeability of a porous media by subflorescent salt precipitation. Using high-resolution CT scanning and detailed Lattice Boltzman Modeling, the three dimensional distribution of salt was mapped and its effect on permeability was calculated. It was found that salt precipitate mass increases towards the soil surface and that the effect of subsurface precipitation on gas permeability was significant, potentially impacting gas exchange processes between atmosphere and vadose zone. In addition, results from the LBM were compared to estimates using the Koseny-Carman equation. A good correlation between these two methods indicates that the Koseny-Carman equation may be sufficient to calculate changes in permeability, providing a more accessible tool relative to the more complicated LBM approach. This study has made it clear that knowledge of the spatial distribution of salt precipitation is essential for any estimation of gas permeability changes due to subflorescence.
机译：人们越来越关注地球上越来越多的水短缺问题，那就是越来越需要了解水在生态系统可持续性和复原力中的作用。与该对话有关的是盐的沉淀和盐碱化对土壤资源的作用。本文通过提供有关亚荧光盐沉淀降低多孔介质的透气性的详细研究结果，来解决此任务。使用高分辨率CT扫描和详细的Lattice Boltzman建模，绘制了盐的三维分布图，并计算了其对渗透率的影响。发现盐沉淀物质量朝着土壤表面增加，并且地下沉淀物对气体渗透性的影响是显着的，可能影响大气和渗流区之间的气体交换过程。此外，将LBM的结果与使用Koseny-Carman方程的估计值进行了比较。两种方法之间的良好相关性表明，Koseny-Carman方程可能足以计算渗透率的变化，相对于更复杂的LBM方法，它提供了更易于使用的工具。这项研究已经清楚地表明，对于任何因亚花序引起的气体渗透率变化的估计，必须了解盐析出物的空间分布。

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  • 来源
  • 会议地点 Ein Bokek(IL)
  • 作者

    Noam Weisbrod; Uri Nachshon; Maria Dragila; Avrami Grader;

  • 作者单位

    Department of Environmental Hydrology Microbiology, Zuckerberg Institute for Water Research, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boker Campus, Midreshet Ben-Gurion, Beersheba 84990, Israel;

    Department of Environmental Hydrology Microbiology, Zuckerberg Institute for Water Research, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boker Campus, Midreshet Ben-Gurion, Beersheba 84990, Israel;

    Department of Crop and Soil Science, Oregon State University, 3017 Agriculture and Life Sciences Building, Corvallis, OR 97331, USA;

    INGRAIN, Houston, TX, USA;

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  • 正文语种 eng
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