"Maximizing The Utility Of Geoelectric Methods For Next Generation Groundwater Evaluation And Management Through Improved Data Acquisition, Inversion and Rock Physics Modeling."

地下水是一种宝贵的资源，与所有加拿大人的生活息息相关。有效的地下水评价和管理面临的重大挑战之一是需要在广泛的空间和时间尺度上确定地下水的特征。与传统的水文地质测量相比，地球物理数据在空间和时间上更加详尽，而且侵入性要小得多，在理解和管理这些系统方面将发挥重要的未来作用。特别令人感兴趣的是地电方法，因为电阻率可以与岩性、饱和度、水量和/或质量相关。这一研究计划的长期目标是通过开发具体问题的解决方案，最大限度地发挥地电测量的有用性，以帮助进行宝石矿研究。此外，其目的是通过培训高素质人员(HQP)，积累加拿大在全球宝石地球物理方法方面的重要专门知识。在水文地质问题中使用地电数据时，通常遵循的工作流程是：i)进行地球物理测量，ii)反演测量数据以获得电阻率模型，iii)将反演模型转换为感兴趣的参数。与此工作流程相关的三个主要挑战是：1)地球物理反问题通常导致对地球物理参数的估计缺乏约束；2)地球物理数据通常需要岩石物理变换来获得感兴趣的参数的估计；3)传统的地球物理测量很少针对特定的科学问题进行优化。鉴于上述挑战的重要性，本提案侧重于处理所有三项挑战的关键组成部分，特别是与地电方法有关的组成部分。这些具体挑战将在利用地球物理学进行改进的背景下加以解决：1)监测和优化受管理的含水层补给；2)使用机载电磁法进行区域地下水建模。拟议计划的研究目标将对我们评估、预算和保护加拿大地下水资源的能力产生重大的积极影响。

Groundwater is a precious resource that plays into the lives of all Canadians. One of significant challenges to effective groundwater evaluation and management (GEM) arises from the need for subsurface characterization over a wide range of spatial and temporal scales. Geophysical data, that are far more spatially and temporally exhaustive and are far less intrusive than traditional hydrogeologic measurements have an important future role to play in the understanding and management of these systems. Of particular interest are geoelectric methods because electrical resistivity can be correlated to lithology, saturation, water quantity and/or quality. The long-term goal of this research program is to maximize the usefulness of geoelectric measurements to aid in GEM through the development of problem specific solutions. Furthermore, the aim is, through the training of high quality personnel (HQP), to build significant Canadian expertise in geophysical approaches to GEM. A common workflow that is followed when using geoelectric data in hydrogeologic problems is to: i) perform a geophysical survey, ii) invert the measured data to obtain an electrical resistivity model and iii) transform the inverted model to a paremeter of interest. Three major challenges associated with this workflow are: 1) geophysical inverse problems typically result poorly constrained estimates of geophysical parameters, 2) geophysical data usually require a rock physics transform to obtain an estimate of the parameter of interest, 3) traditional geophysical surveys are rarely optimized for answering a specific scientific question. Given the importance of the above challenges, this proposal is focused on addressing key components of all three, specifically as they pertain to geoelectric methods. These specific challenges will be addressed in the context of using geophysics for improved: 1) monitoring and optimization of managed aquifer recharge and 2) using airborne EM for regional groundwater modeling. The research goals of the proposed program will have significant positive impacts on our ability to assess, budget, and secure, groundwater resources in Canada.