Collaborative Research: Colloid Mobilization and Transport in the Vadose Zone

合作研究：渗流区的胶体动员和传输

• 批准号: 9909508
• 负责人: James Saiers
• 金额: $ 9.73万
• 依托单位: Yale University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-05-15 至 2004-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9909508&HistoricalAwards=false
• 关键词: Collaborative; Research; Colloid; Mobilization; Transport

9909508SaiersColloids, mobilized within the vadose zone during rainfall events, scavenge and carry contaminants to underlying groundwater. Despite the importance of colloids as agents of vadose-zone contaminant transport, the factors influencing colloid movement through partially saturated porous media have not been rigorously explored nor formalized into a quantitative model. In particular, the role of flow transients on colloid interactions at solid-water interfaces, at air-water interfaces, and within thin films of water has not been adequately investigated to date. This research, carried out jointly by investigators at Yale and at UVA, will integrate laboratory-scale and field-scale experiments with mathematical modeling. We will measure colloid transport in laboratory experiments conducted with ideal media and with intact cores, and we will use these data to guide the development of a numerical model for the coupled advective-dispersive transport and mass transfer of colloids in unsaturated soils. The structure of the numerical model identified from analysis of the laboratory-scale experiments will form the foundation for a stochastic streamtube model, a model capable of accounting for the effects of spatial variability in soil properties on colloid fate and transport. The streamtube model will be tested against data from a field experiment in which colloid mobilization and transport is measured in response to transient flow events induced by controlled sprinkling over an instrumented field plot. Our work represents the first systematic approach to identifying the controls on colloid movement in water-unsaturated media under transient-flow conditions and provides a means to evaluate the contribution of the colloid track to contaminant fluxes within vadose-zone environments.

9909508 SaiersColloids在降雨过程中在包气带内流动，将污染物携带到地下水中。 尽管胶体作为包气带污染物输运剂的重要性，但影响胶体通过部分饱和多孔介质运动的因素尚未被严格探索，也未被形式化为定量模型。 特别是，在固体-水界面，在空气-水界面，并在水薄膜内的胶体相互作用的流动瞬变的作用还没有得到充分的研究。 这项研究由耶鲁大学和弗吉尼亚大学的研究人员联合进行，将实验室规模和现场规模的实验与数学建模相结合。 我们将在实验室进行理想介质和完整的核心，我们将使用这些数据来指导发展的耦合对流扩散运输和质量转移的胶体在非饱和土壤中的数值模型进行胶体运输。 从实验室规模的实验分析确定的数值模型的结构将形成一个随机流管模型的基础，该模型能够占胶体命运和运输的土壤特性的空间变异性的影响。 流管模型将进行测试，从现场实验中，胶体动员和运输的测量响应于瞬态流事件引起的控制喷洒在一个仪表现场情节的数据。 我们的工作代表了第一个系统的方法来确定控制胶体运动在水不饱和介质中的瞬变流条件下，并提供了一种手段来评估的贡献胶体轨道内的污染物通量包气带环境。