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Improved imaging of ground deformation and brine seepage around abandoned flooded salt mines by joint inversion of multiphysics data

Max A. Meju, Bernd Kulessa Orcid Logo, Luis Gallardo, Sarah Thompson, Alastair Ruffell, Kieran Parker

Journal of Applied Geophysics, Volume: 219, Start page: 105217

Swansea University Author: Bernd Kulessa Orcid Logo

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DOI (Published version): 10.1016/j.jappgeo.2023.105217

Abstract

Centuries of bad mine-flooding practice have left a legacy of underground salt mine collapse and contaminated discharges, the scale of which is only slowly being revealed now that ground processes have caused instability over decades to >100 years. Geophysical methods are used for mapping ground...

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Published in: Journal of Applied Geophysics
ISSN: 0926-9851
Published: Elsevier BV 2023
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URI: https://cronfa.swan.ac.uk/Record/cronfa64787
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spelling v2 64787 2023-10-20 Improved imaging of ground deformation and brine seepage around abandoned flooded salt mines by joint inversion of multiphysics data 52acda616e9f6073cbebf497def874c9 0000-0002-4830-4949 Bernd Kulessa Bernd Kulessa true false 2023-10-20 SGE Centuries of bad mine-flooding practice have left a legacy of underground salt mine collapse and contaminated discharges, the scale of which is only slowly being revealed now that ground processes have caused instability over decades to >100 years. Geophysical methods are used for mapping ground subsidence and groundwater contamination at such sites but suffer individually from non-uniqueness and with the underlying mechanism and processes not being well understood. Here, to reduce uncertainty and maximize accuracy we recover subsurface models with structural similarity enforced via crossgradients joint inversion of seismic refraction and dc resistivity data for the top 40 m at former mining areas in Carrickfergus region of Northern Ireland. The models in combination with multispectral image fusion, enable us to identify hitherto unknown mechanism of deformation and compositional changes consistent with the Chebotarev geochemical evolution of groundwater. We found evidence of concealed gravitational slump structures interpreted as being caused by water ingress weakening the gypsum-bearing marl bedrock (via gypsum dissolution and increased fluid pressures within marl) and leading to gravitational gliding deformation, expressed as curved subsidence bands and stepped thrusts coincident with surface zones of brine-mud seepage and sinkhole collapse. Our results have wide-ranging implications for best-practice assessment and management of abandoned flooded salt mines and the hazards they pose to ground stability and water resources world-wide. Journal Article Journal of Applied Geophysics 219 105217 Elsevier BV 0926-9851 Hydrogeophysics, Joint inversion, Electrical resistivity, Seismic velocity, Ground instability, Groundwater contamination 1 12 2023 2023-12-01 10.1016/j.jappgeo.2023.105217 COLLEGE NANME Geography COLLEGE CODE SGE Swansea University SU Library paid the OA fee (TA Institutional Deal) Swansea University 2024-04-15T21:49:25.3973263 2023-10-20T09:36:57.7680627 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Geography Max A. Meju 1 Bernd Kulessa 0000-0002-4830-4949 2 Luis Gallardo 3 Sarah Thompson 4 Alastair Ruffell 5 Kieran Parker 6 64787__29172__0e527f69326444a89eee061ec4427f26.pdf 64787 BKulessa.pdf 2023-12-04T10:09:41.1077593 Output 12256708 application/pdf Version of Record true Crown Copyright © 2023 Published by Elsevier B.V. This is an open access article under the CC BY license. true eng https://creativecommons.org/licenses/by/4.0/
title Improved imaging of ground deformation and brine seepage around abandoned flooded salt mines by joint inversion of multiphysics data
spellingShingle Improved imaging of ground deformation and brine seepage around abandoned flooded salt mines by joint inversion of multiphysics data
Bernd Kulessa
title_short Improved imaging of ground deformation and brine seepage around abandoned flooded salt mines by joint inversion of multiphysics data
title_full Improved imaging of ground deformation and brine seepage around abandoned flooded salt mines by joint inversion of multiphysics data
title_fullStr Improved imaging of ground deformation and brine seepage around abandoned flooded salt mines by joint inversion of multiphysics data
title_full_unstemmed Improved imaging of ground deformation and brine seepage around abandoned flooded salt mines by joint inversion of multiphysics data
title_sort Improved imaging of ground deformation and brine seepage around abandoned flooded salt mines by joint inversion of multiphysics data
author_id_str_mv 52acda616e9f6073cbebf497def874c9
author_id_fullname_str_mv 52acda616e9f6073cbebf497def874c9_***_Bernd Kulessa
author Bernd Kulessa
author2 Max A. Meju
Bernd Kulessa
Luis Gallardo
Sarah Thompson
Alastair Ruffell
Kieran Parker
format Journal article
container_title Journal of Applied Geophysics
container_volume 219
container_start_page 105217
publishDate 2023
institution Swansea University
issn 0926-9851
doi_str_mv 10.1016/j.jappgeo.2023.105217
publisher Elsevier BV
college_str Faculty of Science and Engineering
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hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Geography{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Geography
document_store_str 1
active_str 0
description Centuries of bad mine-flooding practice have left a legacy of underground salt mine collapse and contaminated discharges, the scale of which is only slowly being revealed now that ground processes have caused instability over decades to >100 years. Geophysical methods are used for mapping ground subsidence and groundwater contamination at such sites but suffer individually from non-uniqueness and with the underlying mechanism and processes not being well understood. Here, to reduce uncertainty and maximize accuracy we recover subsurface models with structural similarity enforced via crossgradients joint inversion of seismic refraction and dc resistivity data for the top 40 m at former mining areas in Carrickfergus region of Northern Ireland. The models in combination with multispectral image fusion, enable us to identify hitherto unknown mechanism of deformation and compositional changes consistent with the Chebotarev geochemical evolution of groundwater. We found evidence of concealed gravitational slump structures interpreted as being caused by water ingress weakening the gypsum-bearing marl bedrock (via gypsum dissolution and increased fluid pressures within marl) and leading to gravitational gliding deformation, expressed as curved subsidence bands and stepped thrusts coincident with surface zones of brine-mud seepage and sinkhole collapse. Our results have wide-ranging implications for best-practice assessment and management of abandoned flooded salt mines and the hazards they pose to ground stability and water resources world-wide.
published_date 2023-12-01T21:49:26Z
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