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首页> 外文期刊>Ground Water Monitoring & Remediation >Estimating Persistent Mass Flux of Volatile Contaminants from the Vadose Zone to Ground Water
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Estimating Persistent Mass Flux of Volatile Contaminants from the Vadose Zone to Ground Water

机译：估算从渗流带到地下水的挥发性污染物的持续质量通量

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摘要

Contaminants may persist for long time periods within low permeability portions of the vadose zone where they cannot be effectively treated and are a potential continuing source of contamination to ground water. Setting appropriate vadose zone remediation goals typically requires evaluating these persistent sources in terms of their impact on meeting ground water remediation goals. Estimating the impact on ground water can be challenging at sites with low aqueous recharge rates where vapor-phase movement is the dominant transport process in the vadose zone. Existing one-dimensional approaches for simulating transport of volatile contaminants in the vadose zone are considered and compared to a new flux-continuity-based assessment of vapor-phase contaminant movement from the vadose zone to the ground water. The flux-continuity-based assessment demonstrates that the ability of the ground water to move contaminant away from the water table controls the vapor-phase mass flux from the vadose zone across the water table. Limitations of these approaches are then discussed with respect to the required assumptions and the need to incorporate three-dimensional processes when evaluating vapor-phase transport from the vadose zone to the ground water. The carbon tetrachloride plume at the U.S. Department of Energy*Hanford Site is used as the example site where persistent vadose zone contamination needs to be considered in the context of ground water remediation.
机译：污染物可能在渗流区的低渗透率区域内长期存在，无法有效处理，并且是潜在的持续污染地下水的源头。设定适当的渗流区修复目标通常需要评估这些持久性水源对实现地下水修复目标的影响。在水汽补给率较低的地点，要估算对地下水的影响可能是具有挑战性的，在这些地点，气相运动是渗流带中主要的输运过程。考虑了在渗流区内模拟挥发性污染物迁移的一维方法，并将其与基于新的基于通量连续性的汽相污染物从渗流区到地下水运动的评估相比较。基于通量连续性的评估表明，地下水将污染物从地下水位带走的能力控制着从渗流区到整个地下水位的汽相质量通量。然后，在评估从渗流区到地下水的汽相传输时，针对所需的假设以及结合三维过程的必要性，讨论了这些方法的局限性。以美国能源部*汉福德基地的四氯化碳烟羽为例，在地下水修复的情况下需要考虑持续的渗流带污染。

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  • 来源
    《Ground Water Monitoring & Remediation》 |2009年第2期|63-72|共10页
  • 作者

    M.J. Truex; M. Oostrom; M.L. Brusseau;

  • 作者单位

    Pacific North-west National Laboratory, P.O. Box 999, MS K6-96, Richland, WA 99352;

    Pacific Northwest National Laboratory, P.O. Box 999, MS D6-96, Richland, WA 99352;

    University of Arizona, Tucson. AZ 85721;

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