Quantification of the Impact of Hydrologic Controls on Anomalous Solute Transport and Mixing Dynamics in Partially Saturated Porous Media

水文控制对部分饱和多孔介质中异常溶质输运和混合动力学影响的量化

• 批准号: 2329250
• 负责人: Lazaro Perez
• 金额: $ 33.39万
• 依托单位: Nevada System of Higher Education, Desert Research Institute
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2024
• 资助国家: 美国
• 起止时间: 2024-04-01 至 2027-03-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2329250&HistoricalAwards=false
• 关键词: Quantification; Impact; Hydrologic; Controls; Anomalous

As groundwater moves through the subsurface, it often undergoes chemical reactions as it mixes with other chemically distinct waters, which can facilitate the breakdown of pollutants into less harmful substances. These critical processes of mixing and reaction are significantly influenced by unsaturated conditions, where soil and sediment layers contain phases other than water, such as air or gas, within their pores. This project aims to investigate and quantify how flow, transport, and mixing are impacted by unsaturated conditions in subsurface hydrologic systems. Specifically, the project will use new experimental imaging methods in 3D-printed soil structures and novel numerical simulations to visualize and predict how fluids interact and explore how variations in water content and the physical characteristics of the porous matrix influence mixing and reaction outcomes. Collectively, this research will provide a robust scientific foundation for water resource management and advancing water science, ensuring the protection and sustainability of groundwater resources. Moreover, the project will facilitate impactful educational and training opportunities for students across all levels, complemented by public outreach and initiatives to enhance STEM education. This project will develop and use novel experimental techniques and mathematical models aimed at understanding the complexities of reactive transport in partially saturated porous media. The research focuses on investigating and quantifying the interrelated phenomena of anomalous transport, mixing, and chemical reaction in unsaturated porous media, combining pore- and Darcy-scale visual laboratory experiments and direct numerical simulations. The primary objectives include: 1) Investigating the effects of flow dynamics, medium heterogeneity, and the distribution of fluid phases on solute transport and dispersion using experimental observations in three-dimensional porous media. 2) Utilizing experimental data to assess the role of saturation in promoting reaction hotspots and enhancing mixing processes. 3) Employing pore-scale properties, flow and transport statistics, and reaction rates in reactive transport models to mechanistically describe and predict mixing and reaction. The project results will be relevant for the improved prediction and management of contamination of water resources that rely on the transport and mixing of chemicals to target polluted locations.This award is co-funded by the Hydrologic Sciences program and Established Program to Stimulate Competitive Research (EPSCoR).This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

随着地下水在地下移动时，它通常会与其他化学上不同的水混合，从而经常发生化学反应，这可以促进污染物的分解成较小的危害物质。这些混合和反应的关键过程受到不饱和条件的显着影响，其中土壤和沉积物层在其毛孔内包含水（例如空气或气体）以外的其他相。该项目旨在调查和量化在地下水文系统中不饱和条件的流动，运输和混合的影响。具体而言，该项目将在3D打印的土壤结构和新颖的数值模拟中使用新的实验成像方法，以可视化和预测流体如何相互作用，并探索水含量的变化以及多孔矩阵的物理特征如何影响混合和反应结果。总的来说，这项研究将为水资源管理和推进水科学提供强大的科学基础，以确保地下水资源的保护和可持续性。此外，该项目将促进各个层面的学生有影响力的教育和培训机会，并得到公众的宣传和倡议，以增强STEM教育。该项目将开发和使用新颖的实验技术和数学模型，旨在了解部分饱和的多孔介质中反应性传输的复杂性。该研究重点是研究和量化不饱和多孔培养基中异常转运，混合和化学反应的相互关联现象，结合了孔隙和达西级视觉实验室实验和直接数值模拟。主要目标包括：1）研究流动动力学，中等异质性的影响以及流体相对于使用三维多孔培养基中的实验观测值对溶质传输和分散的分布。 2）利用实验数据来评估饱和度在促进反应热点和增强混合过程中的作用。 3）采用孔隙尺度的特性，流量和运输统计以及反应性传输模型中的反应速率来机械地描述和预测混合和反应。该项目的结果将与依赖化学物质的运输和混合以针对受污染位置的运输和混合的水资源污染的预测和管理有关。该奖项由水文科学计划和既定计划共同拥有，并建立的计划刺激竞争研究（EPSCOR）（EPSCOR）。这一奖项反映了NSF的法定任务和审查的范围，这是通过评估的范围来弥补的。