Evaluating vertical transverse dispersion at sand/clay interfaces in groundwater systems

评估地下水系统中砂/粘土界面的垂直横向扩散

• 批准号: 490461-2015
• 负责人: Sleep, Brent
• 金额: $ 1.75万
• 依托单位: University of Toronto
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=586495
• 关键词: Evaluating; vertical; transverse; dispersion; sand

Groundwater contamination is a serious threat to human and ecosystem health. Remediation of contaminated sites is often challenging because most sites are heterogeneous and contaminants are sequestered in low permeability zones such as clay lenses at these sites. Contaminants slowly diffuse out of these zones in a process referred to as back-diffusion. Back-diffusion at contaminated sites may increase remediation timeframe by decades to centuries. Back-diffusion rates from clay and silt lenses can be greatly impacted by transverse vertical dispersion at the the clay and silt interfaces with more permeable materials. The process of transverse vertical dispersion at interfaces is not well understood. The objective of this project is to develop improved understanding of transverse vertical dispersion through two-dimensional bench scale studies of contaminant transport in systems containing clay lenses. The results of the bench scale studies will be used to develop improved models for predicting contaminant transport in groundwater systems containing clay lenses.

地下水污染是对人类和生态系统健康的严重威胁。受污染场地的补救往往具有挑战性，因为大多数场地是异质的，污染物被隔离在低渗透区，如这些场地的粘土透镜体。污染物在被称为反向扩散的过程中缓慢地扩散出这些区域。受污染场地的反向扩散可能会使补救时间延长数十年至数百年。粘土和粉土透镜体的反向扩散速率会受到渗透性更强的粘土和粉土界面处横向垂直扩散的极大影响。在界面处的横向垂直弥散过程还没有很好的理解。本项目的目标是通过对含有粘土透镜体的系统中污染物输运的二维实验室规模研究，加深对横向垂直扩散的理解。实验室规模研究的结果将用于开发 改进的模型，用于预测含有粘土透镜体的地下水系统中的污染物输运。