Collaborative Research: A Systematic of Solute Transport Influenced by Preferential Flow Paths at the Decimeter and Smaller Scales

合作研究：受分米级和更小尺度优先流路影响的溶质输运系统

• 批准号: 0003914
• 负责人: Steven Gorelick
• 金额: $ 8.97万
• 依托单位: Stanford University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-07-01 至 2005-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0003914&HistoricalAwards=false
• 关键词: Collaborative; Research; Systematic; Solute; Transport

0003914GorelickRecent studies at the Macrodispersion Experiment (MADE) site in Columbus, Mississippi have indicated that the preferential flow paths resulting from aquifer heterogeneities at decimeter (dm) and smaller scales appear to have a dominant effect on plume-scale solute transport. This collaborative research responds to the general lack of studies on the effect of dm-scale heterogeneities on plume-scale solute transport as observed at the MADE site. Our intent is to systematically study the characteristics of solute transport influenced by dm-scale preferential flow paths, and rigorously test the hypothesis that a dual-domain mass transfer approach can provide an effective representation of such characteristics.Four specific elements are integrated into the proposed research. (1) Generate 3-D geologically plausible networks of dm-scale fluvially deposited channels and simulate detailed transport in such systems. (2) Assess the ability of the dual-domain mass transfer model, and possibly other alternative models, to represent the key characteristics of solute transport. (3) Conduct a series of large-diameter column experiments to measure the mass transfer model parameter values under different heterogeneity configurations and flow rates. (4) Conduct tracer tests at the MADE site to obtain the mass transfer model parameter values, using dye-tracing, soil coring and image analysis aimed at providing direct field evidence of preferential flow paths. We will attempt to relate the lithologic characteristics to the mass transfer model parameters obtained from the tracer tests.

密西西比州哥伦布的宏观分散实验（制造）地点进行的0003914 gorelickrectecent研究表明，在十二仪（DM）时由含水层异质性（DM）和较小尺度的含水层异质性产生的优先流动路径似乎具有显着的质量溶质溶质传输效果。 这项合作研究对普遍缺乏关于DM级异质性对羽状溶质传输的影响的研究总体上缺乏研究。 我们的目的是系统地研究受DM级优先流动路径影响的溶质传输的特征，并严格检验了双域传质方法可以提供此类特征的有效表示的假设。四个特定元素已整合到拟议中研究。 （1）生成3-D在地质上的DM尺度河流沉积通道的网络，并在此类系统中模拟详细的传输。 （2）评估双重域传质模型以及其他替代模型的能力，以表示溶质传输的关键特征。 （3）进行一系列大直径实验，以在不同的异质性配置和流速下测量传质模型参数值。 （4）使用染料追踪，土壤芯和图像分析进行示踪剂测试，以获得传质模型参数值，旨在提供优先流动路径的直接现场证据。 我们将尝试将岩性特征与从示踪剂测试获得的传质模型参数联系起来。