Hydrogeological-Geophysical Methods for Subsurface Site Characterization

小行星9628306 该项目侧重于对污染场地的环境管理至关重要的三个问题：降低成本，降低风险，提高地下补救计划的有效性。 这一建议的重要性在于它解决了场地特征鉴定问题：这一问题不仅是场地清理工作中一个非常重要的预算项目，而且现在人们认识到，准确和可靠的场地特征鉴定是任何清理工作取得成功的关键。 我们的目标是发展科学基础和演示方法，为廉价的高分辨率成像的自然不均匀性，并将这些不均匀性与控制流量和污染物运输的水文地质参数，实际上，开发方法“成像”水文地质参数。 我们的重点是通过（a）可行性研究、（B）沉积岩石物理学和（c）改进地球物理和水文地质数据的共同解释程序，帮助建立将浅层地球物理学应用于水文地质问题的科学基础。 一项重要的任务是确定这些共同解释的局限性、陷阱和不确定性，即，量化将浅层地下物理学应用于水文地质场地特征描述的风险。 该提案结合了理论建模，实验室测量分析和集成技术。 我们的方法是联合使用地震和电磁方法来映射地震速度和衰减和电导率的分布在由一组钻孔定义的3-D体积。 在粗略的意义上，速度和电导率都取决于孔隙度，并在较小程度上取决于渗透率、粘土含量、饱和度和孔隙流体的性质。 实验室研究已经非常详细地显示了这些关系，我们现在建议改进这些结果，利用它们来解释水文地质特性分布图方面的调查数据。 这一建议是一个跨学科的研究，因为它整合了水文地质学和地质统计学，地球物理学和岩石物理学领域。 研究人员团队为这个项目带来了大量的集体经验，在执行理论，现场和实验室工作。 为了应对原始预算的削减，我们减少了实验室测试的范围和我们将在可行性研究中调查的地质环境的多样性。 ??

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. ??