Research Initiation: Modeling and Estimation of ContaminantSoil/Air Fluxes

本项目的目标是提供一个良好的理论 估算土壤/空气中气体排放通量的基础 由于地下水的挥发而产生的界面 污染物，包括在泄漏或不受控制时释放的污染物 危险废物的处理、贮存和处置场所。 对这一主题的研究涉及到一个 预测土壤/空气通量的物理数学模型 地质统计学和其他最佳方法的应用 用于校准模型参数和量化模型的估计器 现场规模的不确定性，以及使用 现场数据 该项目强调考虑气相 在非饱和带中的迁移和吸附过程 挥发性有机化合物，并将明确表示时间 以及污染物和介质特性的空间不均匀性， 土壤温度的变化，并在模拟确定的 代表性的现场条件。 Kriging和Bayesian估计 将用于校准空间和时间相关的 模型参数 数据收集工作将补充 可用于模型验证的现场数据有限。 在下列地点向空气中排放有害物质： 它们被掩埋可能会造成重大的环境和健康风险， 然而，目前评估和预测这些排放的能力 是非常有限的。 该项目的结果可能会提供一个更好的基础， 现在可能用于土壤控制系统的工程设计， 危险废物。

The objective of this project is to provide a sound theoretical basis for estimating gaseous emission fluxes at soil/air interfaces which arise from volatilization of subsurface contaminants, including those released at leaking or uncontrolled treatment, storage and disposal sites for hazardous waste. Research on this topic involves the theoretical development of a physically based mathematical model for predicting soil/air fluxes of contaminants, application of geostatistical and other optimal estimators for calibrating model parameters and quantifying model uncertainty at the field scale, and validation of the model using field data. The project emphasizes consideration of the gas phase transport and sorption processes in the unsaturated zone for volatile organic compounds and will explicitly represent temporal and spatial heterogeneities in contaminant and media properties, soil temperature changes, and determined in simulations of representative field conditions. Kriging and Bayesian estimation will be used to calibrate spatially and temporally correlated model parameters. A data collection effort will supplement the limited field data available for model validation. Emissions to the air of hazardous substances released at sites where they are buried may pose significant environmental and health risks, however, the current capability to assess and predict these emissions is extremely limited. Results of this project are likely to provide a better basis then is possible now for engineering design of soil-containment systems for hazardous wastes.