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

0124262Gorelick准确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。 为了预测污染物的归宿和长期迁移，必须准确描述导水率场的空间变异性。 水力传导率测量通常过于稀疏，无法获得地下的高分辨率图像。 鉴于开发地下水流精确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大大有助于了解地下情况。 首先是使用电阻地形图（ERT）作为一种工具，详细绘制地下相对流动路径和流动障碍。 二是建立了一个系统的程序，能够划定水力传导系数，通过综合分析多种数据类型。 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特性图像，我们打算提供与所有数据类型一致的含水层特性图像。我们计划开发一个多数据类型的模拟框架，并测试它使用的结果从实验室规模的实验中收集的6 × 8 × 6英尺的砂罐在拉蒙多尔蒂地球天文台在哥伦比亚大学（由NSF独立资助）和现场规模的演示在马萨诸塞州军事保留地科德角，马萨诸塞州。 这项工作将量化不同类型的数据及其组合的价值，以绘制高分辨率的含水层特性图。 它也将提高电阻和水力传导率之间的关系的理解。 这两个结果对物理水文地质学家、污染水文地质学家和水文地质学家都有参考价值。

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.