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Simulation Of The Vapor Intrusion Process For Nonhomogeneous Soils Using A Three-dimensionalnumerical Model

机译：三维数值模型模拟非均质土壤的蒸汽入侵过程

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摘要

This paper presents model simulation results of vapor intrusion into structures built atop sites contaminated with volatile or semivolatile chemicals of concern. A three-dimensional finite element model was used to investigate the importance of factors that could influence vapor intrusion when the site is characterized by nonhomogeneous soils. Model simulations were performed to examine how soil layers of differing properties alter soil-gas concentration profiles and vapor intrusion rates into structures. The results illustrate difference in soil-gas concentration profiles and vapor intrusion rates between homogeneous and layered soils. The findings support the need for site conceptual models to adequately represent a site's geology when conducting site characterizations, interpreting field data, and assessing the risk of vapor intrusion at a given site. For instance, in layered geologies, a lower permeability and diffusivity soil layer between the source and building often limits vapor intrusion rates, even if a higher permeability layer near the foundation permits increased soil-gas flow rates into the building. In addition, the presence of water-saturated clay layers can considerably influence soil-gas concentration profiles. Therefore, interpreting field data without accounting for clay layers in the site conceptual model could result in inaccurate risk calculations. Important considerations for developing more accurate conceptual site models are discussed in light of the findings.
机译：本文介绍了模型模拟结果，表明蒸汽入侵到受关注的挥发性或半挥发性化学物质污染的站点顶部构建的结构中。当场地以非均质土壤为特征时，使用三维有限元模型研究可能影响蒸汽入侵的因素的重要性。进行了模型模拟，以检查不同性质的土壤层如何改变土壤气体浓度曲线和蒸气侵入结构的速率。结果表明，均质土壤和层状土壤之间的土壤-气体浓度曲线和蒸汽侵入速率存在差异。这些发现支持在进行现场表征，解释现场数据以及评估给定现场的蒸汽侵入风险时，现场概念模型需要充分代表现场的地质情况。例如，在分层地质中，即使地基附近较高的渗透率层允许增加土壤-气体流向建筑物的速度，在源和建筑物之间较低的渗透率和扩散率的土壤层通常会限制蒸汽的入侵速度。另外，水饱和粘土层的存在会大大影响土壤-气体浓度分布。因此，在不考虑场地概念模型中粘土层的情况下解释现场数据可能会导致风险计算不准确。根据调查结果，讨论了开发更准确的概念性站点模型的重要注意事项。

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