EAGER: Contaminant Transport Behavior in and at the Interface of Fine-Grained Sediments; Visualization, Simulation and Analysis

1523488PinderTitle: EAGER：污染物在细颗粒沉积物界面中的运移行为；可视化、模拟和分析环境保护局估计，美国有23.5万到35.5万受污染的地下水场地需要修复。每个进行修复的场地每年的操作和维修费用估计在61万至77万美元之间。众所周知，污染物在细颗粒沉积物中的表现不同，并可能导致作为饮用水源的地下水长期受到污染。然而，尽管人们对此高度关注，但人们对这些细颗粒地层中污染物的行为知之甚少。因此，彻底了解细粒地层中污染物行为的基本物理化学机制至关重要。结果分析将阐明污染地下水场址长期尾矿现象的控制机制。这类污染尾矿对工业造成了财务上的影响，不仅是因为直接成本，还因为他们需要储备资金，以确保对场地修复的长期财政支持。一般公众，政府和工业界寻求加速地下水污染清理，本研究旨在帮助满足这一需求。最后，该提案直接寻求增加工程领域女性的数量。该车辆是工程研究所，是佛蒙特州州长研究所的四个STEM组成部分之一。本建议将实验调查、建模和分析相结合，以解决一项关键的环境需求，将产生以下预期结果：1)利用一种新的MRI技术定性和定量地揭示由尖锐界面分离的细粒和粗粒材料为特征的介质中溶解溶质的输运行为作为时间的函数；2)将通过实验结果和输运模型的融合来评估当前理论捕捉该系统中输运行为的准确性；3)将实验结果与模型相结合进行分析，揭示影响污染物-尾矿现象的因素，这是经济有效的地下水修复的关键。变革成果将通过以下方式实现：1)采用新颖的MRI技术揭示示踪剂在多孔介质中的输运行为；2)采用数学模型模拟MRI实验中观察到的行为；3)结合实验和数学模型结果分析示踪剂在细颗粒介质中运动的影响，细颗粒介质与粗颗粒宿主被尖锐界面分离。

1523488PinderTitle: EAGER: Contaminant Transport Behavior in and at the Interface of Fine-Grained Sediments; Visualization, Simulation and AnalysisEPA estimates that there are 235,000 to 355,000 contaminated groundwater sites across the United States that require remediation. The annual operation and maintenance costs, per site undergoing remediation, are estimated to range from $610,000 to $770,000. It is well known that contaminants behave differently in fine grained sediments and may lead to long term contamination of groundwater used as a source of drinking water. However, in spite of this high level of concern there is very little known about the behavior of contaminants that reside in these fine grained formations. It is therefore critical that the fundamental physical-chemical mechanisms responsible for contaminant behavior in fine-grained formations be thoroughly understood. The resulting analysis will elucidate the mechanisms that govern the long-term tailing phenomena observed in contaminated groundwater sites. Such contaminant tailing impacts industry financially, not only because of the direct costs, but also because of their requirement to hold money in reserve to assure long-term financial support for site remediation. The general public, government and industry seek to accelerate groundwater contamination cleanup and this research is designed to help satisfy this need. Finally, this proposal seeks directly to increase the number of women in engineering. The vehicle is the Engineering Institute that is one of four STEM components of the Governor's Institutes of Vermont.The combination of experimental investigation, modeling and analysis proposed in this proposal to address a critical environmental need will yield the following expected outcomes; 1) the transport behavior of dissolved solutes in media characterized by fine and coarse grained materials separated by a sharp interface will be revealed both qualitatively and quantitatively as a function of time using a novel MRI technology, 2) the veracity of current theory to capture the transport behavior in this system will be evaluated through the fusion of experimental results and transport modeling, and, 3) the experimental results in combination with the modeling will be analyzed to uncover the factors impacting the contaminant-tailing phenomenon which is critical to cost-effective groundwater remediation. The transformative outcomes will be achieved by; 1) employing novel MRI technology to reveal the behavior of tracer transport in porous media, 2) employing mathematical modeling to simulate the behavior observed in the MRI experiments, and, 3) combining experimental and mathematical modeling results to analyze the impact of the movement of tracers in fine-grained media separated from a coarse-grained host by a sharp interface.