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首页> 外文期刊>Environmental toxicology and chemistry >SENSITIVITY ANALYSIS ON PARAMETERS AND PROCESSES AFFECTING VAPOR INTRUSION RISK
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SENSITIVITY ANALYSIS ON PARAMETERS AND PROCESSES AFFECTING VAPOR INTRUSION RISK

机译：影响蒸气侵入风险的参数和过程的敏感性分析

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摘要

A one-dimensional numerical model was developed and used to identify the key processes controlling vapor intrusion risks by means of a sensitivity analysis. The model simulates the fate of a dissolved volatile organic compound present below the ventilated crawl space of a house. In contrast to the vast majority of previous studies, this model accounts for vertical variation of soil water saturation and includes aerobic biodegradation. The attenuation factor (ratio between concentration in the crawl space and source concentration) and the characteristic time to approach maximum concentrations were calculated and compared for a variety of scenarios. These concepts allow an understanding of controlling mechanisms and aid in the identification of critical parameters to be collected for field situations. The relative distance of the source to the nearest gas-filled pores of the unsaturated zone is the most critical parameter because diffusive contaminant transport is significantly slower in water-filled pores than in gas-filled pores. Therefore, attenuation factors decrease and characteristic times increase with increasing relative distance of the contaminant dissolved source to the nearest gas diffusion front. Aerobic biodegradation may decrease the attenuation factor by up to three orders of magnitude. Moreover, the occurrence of water table oscillations is of importance. Dynamic processes leading to a retreating water table increase the attenuation factor by two orders of magnitude because of the enhanced gas phase diffusion.
机译：开发了一维数值模型，并通过敏感性分析来识别控制蒸汽入侵风险的关键过程。该模型模拟存在于房屋通风爬行空间下方的溶解性挥发性有机化合物的结局。与绝大多数以前的研究相比，该模型解释了土壤水分饱和度的垂直变化，并包括有氧生物降解。计算了衰减因子（爬升空间中的浓度与源浓度之间的比率）和接近最大浓度的特征时间，并针对各种情况进行了比较。这些概念使您可以了解控制机制，并有助于确定要为现场情况收集的关键参数。源与不饱和区最近的充气孔的相对距离是最关键的参数，因为在水孔中扩散污染物的传输明显慢于在气体孔中。因此，随着污染物溶解源到最近的气体扩散前沿的相对距离的增加，衰减因子减小，特征时间增加。有氧生物降解可将衰减因子降低多达三个数量级。此外，地下水位振荡的发生也很重要。由于增加了气相扩散，导致退回地下水位的动态过程使衰减因子增加了两个数量级。

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  • 来源
    《Environmental toxicology and chemistry》 |2012年第5期|p.1042-1052|共11页
  • 作者

    Sara Picone; Johan Valstar; Pauline van Gaans; Tim Grotenhuis; Huub Runaarts;

  • 作者单位

    Wageningen University, Subdepartment of Environmental Technology, Wageningen, The Netherlands;

    Deltares Soil and Groundwater Systems, Utrecht, The Netherlands;

    Deltares Soil and Groundwater Systems, Utrecht, The Netherlands;

    Wageningen University, Subdepartment of Environmental Technology, Wageningen, The Netherlands;

    Wageningen University, Subdepartment of Environmental Technology, Wageningen, The Netherlands;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    modeling; vapor intrusion; variable soil moisture; dynamic processes; biodegradation;

    机译：造型;蒸气侵入土壤湿度可变;动态过程;生物降解;

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