Johnson-Ettinger蒸气入侵风险评估模型参数修正研究
Parameters Modification of Johnson-Ettinger Vapor Intrusion Risk Assessment Model
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摘要: Johnson-Ettinger蒸气入侵模型(J-E模型)作为目前应用最广泛的评价蒸气入侵潜在风险的筛选工具，其模型预测结果的准确性影响蒸气入侵风险的判断。通过对J-E模型进行敏感性分析，发现对其预测结果影响较大的参数依次为土壤毛细管层含水率、空气交换指数、封闭空间的体积以及毛细管层的厚度。基于以上分析结果，提出采用美国环境保护局(US EPA)推荐的饱和含水率对毛细管层含水率进行修正，毛细管层厚度采用VG方程描述的水分特征曲线拐点处的毛细管压头进行修正。修正后的J-E模型预测结果与三维数值模拟的计算结果较为吻合，两者的差距不到1个数量级。Abstract: At present, the Johnson-Ettinger (J-E) model is the most popular screening tool for evaluating the potential risk of vapor intrusion, which is a process by that the contaminant soil gas migrate from a subsurface vapor source into the building. In this study, a sensitivity analysis of J-E model was performed to identify most important parameters. The analysis suggests that the soil moisture content in the capillary fringe is of the greatest influence, followed by air exchange rate, enclosed space volume and thickness of capillary fringe. Based on such results, the study proposed to employ a saturated water content in the capillary fringe and the capillary head at inflection point of water retention curve as the thickness of the capillary fringe. After the application of this modification, the model predictions are in better agreement with three-dimensional numerical simulations, with differences less than one order of magnitude.
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Key words:
- J-E model /
- risk assessment /
- sensitivity analysis /
- parameter modification
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