Collaborative Research: Fundamental Research on Oscillatory Flow in Hydrogeology

合作研究：水文地质振荡流基础研究

• 批准号: 1215746
• 负责人: Michael Cardiff
• 金额: $ 17.38万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-07-01 至 2015-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1215746&HistoricalAwards=false
• 关键词: Collaborative; Research; Fundamental; Oscillatory; Flow

Collaborative research: Fundamental Research on Oscillatory Flow in HydrogeologyPeter Kitanidis, Stanford UniversityMichael Cardiff, University of WisconsinWarren Barrash, Boise State UniversityThe conventional approach to representing the governing physics of fluid flow in hydrogeology is based on the premises that (a) fluid flow can be treated separately from deformation in the solid matrix and (b) changes in flow conditions are gradual (i.e., allowing simplifying assumptions about momentum changes to be valid). Oscillatory flows may violate these premises in certain ?intermediate? frequency ranges, regardless of whether they are created deliberately at a well for purposes of monitoring or site characterization, or are created accidentally from a natural or man-made source. These violations raise important questions for understanding oscillatory fluid flow in subsurface porous media at core and field scales (i.e., scales of interest in hydrologic applications): (a) must Darcy?s law be modified? and (b) do controlling hydraulic parameters such as permeability and elastic storage change with oscillation frequency rather than remain constant? This research is a comprehensive study of oscillatory flows at intermediate frequencies involving: a careful mathematical study of flow at the pore scale and upscaling to the core scale to generalize Darcy?s law; experiments in a laboratory sandbox to test/validate the theoretical developments and examine heterogeneous cases including infiltration of an immiscible fluid; and upscaling to hydrologic scale with controlled oscillatory flow experiments in the field at a highly characterized research wellfield to test/validate theoretical developments and models. Expected results include a rigorous theoretical treatment of oscillatory flow mechanics leading to predictions and modeling of oscillatory signal propagation characteristics and frequency dependent aquifer parameter behavior at laboratory and field scale for a range of porous media materials. This project has broad impacts for society overall and for the scientific and engineering communities because it deals with basic hydrologic research in the subsurface, where most of the available freshwater is stored. In the United States, groundwater is the primary source of water for over 50 percent of Americans, and roughly 95 percent for those in rural areas. In the world, many of the most important aquifers are being gradually depleted or contaminated. This research will lead to better methods for the restoration and management of this important resource. In particular, oscillatory flows may become important tools for characterization of subsurface volumes to determine the 3D heterogeneity of aquifer parameters and to monitor for changes in water quality or aquifer status without having to remove water (that may be contaminated and hazardous). Oscillatory flows also have potential applications in enhancing mixing, which can enhance reaction rates and result in more efficient site remediation technologies.

合作研究：水文地质学中振荡流的基础研究Peter Kitanjun，斯坦福大学Michael卡迪夫，威斯康星大学Warren Barrash，博伊西州立大学表示水文地质学中流体流动的控制物理学的传统方法是基于以下前提：（a）流体流动可以与固体基质中的变形分开处理，以及（B）流动条件的变化是渐进的（即，允许关于动量变化的简化假设是有效的）。 振荡流可能违反这些前提在某些？中级？频率范围，无论它们是为了监测或现场表征的目的而在井中故意产生的，还是从自然或人为源意外产生的。 这些违反提出了重要的问题，以了解地下多孔介质中的振荡流体流动在核心和领域的规模（即，感兴趣的水文应用尺度）：（一）必须达西？法律要修改吗？（B）渗透率、弹性库容等控制水力参数是否随振荡频率变化而变化？这项研究是一个全面的研究振荡流在中频涉及：仔细的数学研究流动在孔隙尺度和放大到核心规模概括达西？的法律;在实验室沙箱中进行实验，以测试/验证理论发展，并检查非均质情况，包括不混溶流体的渗透;在高度表征的研究井场进行现场受控振荡流实验，以测试/验证理论发展和模型。 预期的结果包括一个严格的理论处理的振荡流力学导致的预测和建模的振荡信号传播特性和频率相关的含水层参数的行为在实验室和现场规模的多孔介质材料的范围。该项目对整个社会以及科学和工程界具有广泛影响，因为它涉及地下的基本水文研究，而大部分可用淡水都储存在地下。 在美国，地下水是超过50%的美国人的主要水源，大约95%的人生活在农村地区。在世界上，许多最重要的含水层正在逐渐枯竭或受到污染。 这项研究将为恢复和管理这一重要资源提供更好的方法。 特别是，振荡流可能成为表征地下体积的重要工具，以确定含水层参数的三维异质性，并监测水质或含水层状态的变化，而不必去除水（可能是污染和危险的）。 振荡流在增强混合方面也有潜在的应用，这可以提高反应速率，并导致更有效的现场补救技术。