Improved hydrogeophysical imaging by structural coupling of 2D magnetic resonance and electrical resistivity tomography

Geophysics - Tập 86 Số 5 - Trang WB77-WB88 - 2021
Nico Skibbe1, Thomas Günther1, Mike Müller‐Petke1
1Leibniz Institute for Applied Geophysics, Stilleweg 2, Hannover 30655, Germany.(corresponding author); .

Tóm tắt

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.

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Tài liệu tham khảo

10.1190/geo2011-0404.1

10.1002/2015WR017016

10.3997/1873-0604.2005011

10.3997/1873-0604.2009010

10.2113/JEEG16.3.95

10.1016/j.jappgeo.2016.11.007

10.1190/geo2012-0187.1

10.3997/1873-0604.2013062

10.1190/1.3496476

10.1016/j.jappgeo.2011.04.008

10.1002/hyp.13260

10.2136/vzj2018.12.0209

10.1029/2003GL017370

Guenther, T., 2004, Inversion methods and resolution analysis for the 2D/3D reconstruction of resistivity structures from DC measurements: Ph.D. thesis, University of Mining and Technology Freiberg.

10.5194/hess-16-3279-2012

Günther, T., and C. Rücker, 2006, A new joint inversion approach applied to the combined tomography of DC resistivity and seismic refraction data: Symposium on the Application of Geophysics to Engineering and Environmental Problems, 1196–1202.

10.1088/0266-5611/13/1/006

10.1016/j.jappgeo.2017.06.008

10.1109/TGRS.2007.903829

10.1190/geo2020-0052.1

10.1093/gji/ggu434

10.1190/geo2017-0756.1

10.1093/gji/ggz550

10.1093/gji/ggy055

10.1088/1742-2132/8/1/004

10.1109/TGRS.2011.2135861

10.1111/j.1365-246X.2012.05380.x

10.1093/gji/ggt255

10.1029/2006WR005131

10.1190/1.3471523

10.1190/geo2015-0461.1

10.5194/se-8-671-2017

Rubin Y., 2006, Hydrogeophysics

10.1016/j.cageo.2017.07.011

10.1190/geo2018-0046.1

10.1190/geo2019-0484.1

10.5194/hess-16-3621-2012

10.1103/PhysRevE.62.1290

Zhang, J., and F. D. Morgan, 1996, Joint seismic and electrical tomography: Symposium on the Application of Geophysics to Engineering and Environmental Problems, 391–396.

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Thông tin xuất bản

Geophysics

Tập 86 Số 5

WB77-WB88

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