Mapping Aquifer Heterogeneity: Integrated Analysis of Electrical Resistance Tomography, Tracer Tests, and Hydraulic Data

准确表征地下水系统中的流量和溶质运移是水文学中的一个关键问题。为了预测污染物的命运和长期迁移，准确描述水力传导场的空间变异性是必不可少的。水力导率测量通常过于稀疏，无法获得地下的高分辨率图像。考虑到建立精确的地下流模型所需的大量数据，以及直接采样的成本，使用地球物理方法可以对地下信息做出重大贡献。这项研究的重点有两个方面。首先是利用电阻地形（ERT）作为详细绘制地下相对流动路径和流动障碍的工具。其次是建立一个系统的程序，能够通过多种数据类型的综合分析来描绘水力导电性。通过在模拟-反演框架中对这些数据进行分析，我们打算提供与所有数据反演框架一致的含水层属性图像，我们打算提供与所有数据类型一致的含水层属性图像。我们计划开发一个多数据类型的模拟框架，并使用在哥伦比亚大学Lamont Doherty地球观测站（由美国国家科学基金会独立资助）的6 x 8 x 6英尺沙箱中收集的实验室规模实验结果进行测试，并在马萨诸塞州科德角的马萨诸塞州军事保留地进行现场规模的演示。这项工作将量化不同类型数据的价值，以及它们的组合，以开发含水层属性的高分辨率地图。它还将提高对电阻和水力导电性之间关系的理解。这两个结果对物理水文地质学家、污染物水文地质学家和地球物理学家都有价值。

0124262GorelickAccurately characterizing flow and solute transport in groundwater systems is a critical problem in hydrology. In order to predict the fate and long-term transport of contaminants, an accurate depiction of the spatial variability of the hydraulic conductivity field is essential. Hydraulic conductivity measurements are generally too sparse to obtain a high-resolution image of the subsurface. Given the large volume of data required to develop an accurate model of subsurface flow, and the cost of direct sampling, the use of geophysical methods can contribute significantly to information about the subsurface.The focus of this research is two-fold. First is the use of electrical resistance topography (ERT) as a tool to map subsurface relative flow paths and flow barriers in detail. Second is the establishment of a systematic procedure capable of delineating hydraulic conductivity through integrated analysis of multiple data types. By analyzing these data together in a simulation-inversion framework, we intend to provide images of aquifer properties consistent with all data inversion framework, we intend to provide images of aquifer properties consistent with all data types. We plan to develop a multiple data type simulation-framework, and test it using results from laboratory-scale experiments collected in 6 x 8 x 6 foot sand tank at the Lamont Doherty Earth Observatory at Columbia University (funded independently by NSF) and field-scale demonstration at the Massachusetts Military Reservation on Cape Cod, Massachusetts. This work will quantify the worth of different types of data, and their combination, to develop high-resolution maps of aquifer properties. It will also improve the understanding of the relationship between electrical resistance and hydraulic conductivity. Both of these results will be valuable to physical hydrogeologist, contaminant hydrogeologists, and geophysicists.