School of Engineering, Brown University, Providence, RI 02912, USA.
Environ Sci Process Impacts. 2013 Jul;15(7):1444-51. doi: 10.1039/c3em00225j.
The U.S. EPA has developed a database of field data obtained from vapor intrusion sites throughout the United States. Large variations in reported subsurface contaminant vapor concentration ratios (e.g. building subslab to groundwater source) present challenges for the analysis of subsurface vapor transport processes. Meanwhile, numerical models have been used by the U.S. EPA and others to describe the transport processes governing vapor intrusion. The influence of the capillary fringe has often been ignored in these models. In this manuscript, the influence of soil moisture content on the subslab vapor concentration is analyzed in the context of mathematical models. Results are compared to those from other modeling methods that do not account for the soil moisture content. The slab capping effect is observed to interact with the effect of soil moisture in determining the subslab contaminant vapor concentration. The slab capping effect is observed to be significant when the building-source separation distance is less than half of the slab size.
美国环保署（EPA）开发了一个数据库，其中包含了全美各地蒸气入侵地点的现场数据。报告的地下污染物蒸气浓度比（例如，建筑物地下室与地下水源）存在很大差异，这给地下蒸气运移过程的分析带来了挑战。同时，美国环保署和其他机构也使用数值模型来描述控制蒸气入侵的传输过程。这些模型往往忽略了毛细边界层的影响。在本文中，从数学模型的角度分析了土壤湿度对地下室蒸气浓度的影响。将结果与不考虑土壤湿度的其他建模方法进行了比较。观察到板盖效应与土壤湿度的相互作用，从而确定了地下室污染物蒸气浓度。当建筑物与源之间的距离小于板尺寸的一半时，板盖效应明显。
