Hydrogeological-Geophysical Methods for Subsurface Site Characterization

地下场地表征的水文地质-地球物理方法

• 批准号: 9628306
• 负责人: Yoram Rubin
• 金额: $ 27万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-09-01 至 2001-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9628306&HistoricalAwards=false
• 关键词: Hydrogeological; Geophysical; Methods; Subsurface; Site

9628306 Yoram Rubin This project focuses on three issues that are critical to environmental management of contaminated sites: reducing cost, reducing risk, and increasing the effectiveness of subsurface remediation schemes. The significance of this proposal is that it addresses the issue of site characterization: not only that this issue is a very significant budget item in the site cleanup effort, but also it is now realized that accurate and reliable site characterization is the key to the success of any cleanup effort. Our objective is to develop the scientific basis and demonstrate methodologies for inexpensive high resolution imaging of natural heterogeneities and for relating these heterogeneities to the hydrogeologic parameters that control flow and contaminant transport--in effect, to develop methods for "imaging" hydrogeologic parameters. Our focus is to help establish the scientific basis for applying shallow geophysics to hydrogeological problems, through (a) feasibility studies, (b) sediment-rock physics, and (c) improvements in the procedures for co-interpretation of geophysical and hydrogeological data. An essential task will be to identify limitations, pitfalls, and uncertainties of these co-interpretation--i.e., to quantify the risks in applying shallow geophysics to hydrogeological site characterization. The proposal combines theoretical modeling, analysis of laboratory measurements, and integration techniques. Our approach is to use seismic and electromagnetic methods jointly to map the distribution to seismic velocity and attenuation and electrical conductivity in the the 3-D volume defined by a set of boreholes. In a rough sense, both velocity and conductivity depend on porosity and to a lesser extent on permeability, clay content, saturation and nature of pore fluid. Laboratory studies have shown these relationships in great detail and we now propose to refine these results to utilize them to interpret survey data in terms of map of the distribution of t he hydrogeologic properties. This proposal is an interdisciplinary study, since it integrates the fields of hydrogeology and geostatistics, geophysics, and rock physics. The team of researchers brings to this project a large collective experience in performing theoretical, field, and lab work. In response to cuts in the original budget, we reduced the scope of lab testing and the variety of geological setting that we shall investigate under Feasibility Studies. ??

9628306约拉姆·鲁宾（Yoram Rubin）该项目着重于三个问题，这些问题对于污染地点的环境管理至关重要：降低成本，降低风险以及提高地下补救方案的有效性。 该提案的意义在于它解决了站点表征的问题：不仅此问题是网站清理工作中非常重要的预算项目，而且现在已经意识到，准确可靠的站点表征是任何清理工作成功的关键。 我们的目标是建立科学基础，并展示对自然异质性的廉价高分辨率成像的方法论，并将这些异质性与控制流动和污染物传输的水文地质参数联系起来，以开发用于“成像”水文学参数的方法。 我们的重点是通过（a）可行性研究，（b）沉积物 - 摇滚物理学以及（c）改进地球物理和水文学数据共同解释的程序，以帮助建立科学基础，以将浅地球物理学应用于水文地质问题。 一项必不可少的任务是确定这些共同解释的局限性，陷阱和不确定性 - 即量化将浅地地球物理学应用于水文地质地理位置表征的风险。 该提案结合了理论建模，实验室测量分析和集成技术。 我们的方法是使用地震和电磁方法共同将分布映射到由一组钻孔定义的3-D体积中的地震速度，衰减和电导率。 从粗略的意义上讲，速度和电导率都取决于孔隙率，并且在较小程度上取决于孔隙流体的渗透性，粘土含量，饱和度和性质。 实验室研究表明了这些关系非常详细，我们现在建议完善这些结果，以利用它们来解释水文地质特性的分布图。 该提议是一项跨学科研究，因为它整合了水文地质和地统计学，地球物理学和岩石物理学领域。 研究人员团队为该项目带来了丰富的集体经验，以执行理论，领域和实验室工作。 为了响应原始预算的削减，我们降低了实验室测试的范围和在可行性研究中应调查的地质环境的范围。 ？