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

准确地描述地下水系统中的流动和溶质运移是水文学中的一个关键问题。为了预测污染物的去向和长期迁移，准确描述渗透系数场的空间变异性是必不可少的。水力传导性测量通常过于稀疏，无法获得地下表面的高分辨率图像。考虑到开发准确的地下水流模型所需的大量数据，以及直接采样的成本，地球物理方法的使用可以极大地促进关于地下水流的信息。这项研究的重点是双重的。首先是使用电阻地形(ERT)作为工具来详细绘制地下相对流动路径和流动障碍物。第二是建立一套系统的程序，能够通过综合分析多种数据类型来划定水力传导度。通过在模拟-反演框架中一起分析这些数据，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拉蒙特·多尔蒂地球天文台(由NSF独立资助)的6x8x6英尺沙箱中收集的实验室规模实验和马萨诸塞州科德角马萨诸塞州军事保护区的现场规模演示的结果来测试它。这项工作将量化不同类型的数据及其组合的价值，以开发高分辨率的含水层属性地图。它还将提高对电阻和水力传导性之间关系的理解。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一定的参考价值。

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.