Quasi-3-D resistivity imaging – mapping of heterogeneous frozen ground conditions using electrical resistivity tomography
Up to now an efficient 3-D geophysical mapping of the subsurface in mountainous environments with rough terrain has not been possible. A merging approach of several closely spaced 2-D electrical resistivity tomography (ERT) surveys to build up a quasi-3-D model of the electrical resistivity is prese...
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ftcopernicus:oai:publications.copernicus.org:tcd2135 2023-05-15T17:57:04+02:00 Quasi-3-D resistivity imaging – mapping of heterogeneous frozen ground conditions using electrical resistivity tomography Kneisel, C. Bast, A. Schwindt, D. 2018-09-26 application/pdf https://doi.org/10.5194/tcd-3-895-2009 https://tc.copernicus.org/preprints/tc-2009-25/ eng eng doi:10.5194/tcd-3-895-2009 https://tc.copernicus.org/preprints/tc-2009-25/ eISSN: 1994-0424 Text 2018 ftcopernicus https://doi.org/10.5194/tcd-3-895-2009 2020-07-20T16:26:32Z Up to now an efficient 3-D geophysical mapping of the subsurface in mountainous environments with rough terrain has not been possible. A merging approach of several closely spaced 2-D electrical resistivity tomography (ERT) surveys to build up a quasi-3-D model of the electrical resistivity is presented herein as a practical compromise for inferring subsurface characteristics and lithology. The ERT measurements were realised in a small glacier forefield in the Swiss Alps with complex terrain exhibiting a small scale spatial variability of surface substrate. To build up the grid for the quasi-3-D measurements the ERT surveys were arranged as parallel profiles and perpendicular tie lines. The measured 2-D datasets were collated into one quasi-3-D file. A forward modelling approach – based on studies at a permafrost site below timberline – was used to optimize the geophysical survey design for the mapping of the mountain permafrost distribution in the investigated glacier forefield. Quasi-3-D geoelectrical imaging is a useful method for mapping of heterogeneous frozen ground conditions and can be considered as a further milestone in the application of near surface geophysics in mountain permafrost environments. Text permafrost Copernicus Publications: E-Journals |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
Up to now an efficient 3-D geophysical mapping of the subsurface in mountainous environments with rough terrain has not been possible. A merging approach of several closely spaced 2-D electrical resistivity tomography (ERT) surveys to build up a quasi-3-D model of the electrical resistivity is presented herein as a practical compromise for inferring subsurface characteristics and lithology. The ERT measurements were realised in a small glacier forefield in the Swiss Alps with complex terrain exhibiting a small scale spatial variability of surface substrate. To build up the grid for the quasi-3-D measurements the ERT surveys were arranged as parallel profiles and perpendicular tie lines. The measured 2-D datasets were collated into one quasi-3-D file. A forward modelling approach – based on studies at a permafrost site below timberline – was used to optimize the geophysical survey design for the mapping of the mountain permafrost distribution in the investigated glacier forefield. Quasi-3-D geoelectrical imaging is a useful method for mapping of heterogeneous frozen ground conditions and can be considered as a further milestone in the application of near surface geophysics in mountain permafrost environments. |
format |
Text |
author |
Kneisel, C. Bast, A. Schwindt, D. |
spellingShingle |
Kneisel, C. Bast, A. Schwindt, D. Quasi-3-D resistivity imaging – mapping of heterogeneous frozen ground conditions using electrical resistivity tomography |
author_facet |
Kneisel, C. Bast, A. Schwindt, D. |
author_sort |
Kneisel, C. |
title |
Quasi-3-D resistivity imaging – mapping of heterogeneous frozen ground conditions using electrical resistivity tomography |
title_short |
Quasi-3-D resistivity imaging – mapping of heterogeneous frozen ground conditions using electrical resistivity tomography |
title_full |
Quasi-3-D resistivity imaging – mapping of heterogeneous frozen ground conditions using electrical resistivity tomography |
title_fullStr |
Quasi-3-D resistivity imaging – mapping of heterogeneous frozen ground conditions using electrical resistivity tomography |
title_full_unstemmed |
Quasi-3-D resistivity imaging – mapping of heterogeneous frozen ground conditions using electrical resistivity tomography |
title_sort |
quasi-3-d resistivity imaging – mapping of heterogeneous frozen ground conditions using electrical resistivity tomography |
publishDate |
2018 |
url |
https://doi.org/10.5194/tcd-3-895-2009 https://tc.copernicus.org/preprints/tc-2009-25/ |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tcd-3-895-2009 https://tc.copernicus.org/preprints/tc-2009-25/ |
op_doi |
https://doi.org/10.5194/tcd-3-895-2009 |
_version_ |
1766165421946306560 |