Describing hydraulic properties in the subsurface in at least two dimensions is one of the main objectives in hydrogeophysics. However, due to the limited resolution and ambiguity of the individual methods, those images are often blurry. We have developed a methodology to combine two measuring methods, magnetic resonance tomography (MRT) and electrical resistivity tomography (ERT). To this end, we extend a structurally coupled cooperative inversion scheme to three parameters. It results in clearer images of the three main parameters: water content, relaxation time, and electrical resistivity; thus, there is a less ambiguous hydrogeophysical interpretation. Synthetic models demonstrate its effectiveness and show how the parameters of the coupling equation affect the images and how they can be chosen. Furthermore, we examine the influence of resistivity structures on the MRT kernel function. We apply the method to a roll-along MRT data set and a detailed ERT profile. As a final result, a hydraulic conductivity image is produced. Known ground-penetrating radar reflectors act as the ground truth and demonstrate that the obtained images are improved by the structural coupling.

中文翻译：

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通过二维磁共振和电阻率层析成像的结构耦合改进水文地球物理成像

至少在两个维度上描述地下的水力特性是水文地球物理学的主要目标之一。然而，由于单个方法的分辨率有限和模糊性，这些图像通常是模糊的。我们开发了一种方法来结合两种测量方法，磁共振断层扫描 (MRT) 和电阻率断层扫描 (ERT)。为此，我们将结构耦合的合作反演方案扩展到三个参数。它可以使三个主要参数的图像更清晰：含水量、弛豫时间和电阻率；因此，水文地球物理解释不那么模糊。合成模型展示了它的有效性，并展示了耦合方程的参数如何影响图像以及如何选择它们。此外，我们研究了电阻率结构对 MRT 核函数的影响。我们将该方法应用于滚动 MRT 数据集和详细的 ERT 配置文件。作为最终结果，产生了水力传导率图像。已知的探地雷达反射器充当地面实况，并证明所获得的图像通过结构耦合得到了改进。