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

绘制含水层非均质性图：电阻层析成像、示踪剂测试和水力数据的综合分析

• 批准号: 0124262
• 负责人: Steven Gorelick
• 金额: $ 40.2万
• 依托单位: Stanford University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-02-01 至 2007-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0124262&HistoricalAwards=false
• 关键词: Mapping; Aquifer; Heterogeneity; Integrated; Analysis

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.

0124262Gorelick 准确描述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，准确描述水力传导率场的空间变化至关重要。 水力传导率测量通常太稀疏，无法获得地下的高分辨率图像。 鉴于开发准确的地下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显着地提供有关地下的信息。这项研究的重点有两个方面。 首先是使用电阻地形图 (ERT) 作为工具来详细绘制地下相对流动路径和流动屏障。 其次是建立一个能够通过多种数据类型的综合分析来描述水力传导率的系统程序。 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模拟框架，并使用在哥伦比亚大学拉蒙特多尔蒂地球观测站（由 NSF 独立资助）的 6 x 8 x 6 英尺沙池中收集的实验室规模实验结果对其进行测试，并进行现场测试在马萨诸塞州科德角的马萨诸塞州军事保留地进行的规模演示。 这项工作将量化不同类型数据及其组合的价值，以开发含水层特性的高分辨率地图。 它还将增进对电阻和水力传导率之间关系的理解。 这两项结果对于自然水文地质学家、污染物水文地质学家和地球物理学家来说都很有价值。