Optimisation of quasi-3D electrical resistivity imaging – application and inversion for investigating heterogeneous mountain permafrost
This study aimed to optimise the application, efficiency and interpretability of quasi-3D resistivity imaging for investigating the heterogeneous permafrost distribution at mountain sites by a systematic forward modelling approach. A three dimensional geocryologic model, representative for most moun...
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Online Access: | https://opus.bibliothek.uni-wuerzburg.de/frontdoor/index/index/docId/13801 https://nbn-resolving.org/urn:nbn:de:bvb:20-opus-138017 https://doi.org/10.5194/tcd-5-3383-2011 https://opus.bibliothek.uni-wuerzburg.de/files/13801/Schwindt_tcd-5-3383-2011.pdf |
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ftunivwuerz:oai:opus.bibliothek.uni-wuerzburg.de:13801 2023-05-15T13:03:11+02:00 Optimisation of quasi-3D electrical resistivity imaging – application and inversion for investigating heterogeneous mountain permafrost Schwindt, Daniel Kneisel, Christof 2011 application/pdf https://opus.bibliothek.uni-wuerzburg.de/frontdoor/index/index/docId/13801 https://nbn-resolving.org/urn:nbn:de:bvb:20-opus-138017 https://doi.org/10.5194/tcd-5-3383-2011 https://opus.bibliothek.uni-wuerzburg.de/files/13801/Schwindt_tcd-5-3383-2011.pdf eng eng https://opus.bibliothek.uni-wuerzburg.de/frontdoor/index/index/docId/13801 urn:nbn:de:bvb:20-opus-138017 https://nbn-resolving.org/urn:nbn:de:bvb:20-opus-138017 https://doi.org/10.5194/tcd-5-3383-2011 https://opus.bibliothek.uni-wuerzburg.de/files/13801/Schwindt_tcd-5-3383-2011.pdf https://creativecommons.org/licenses/by/3.0/de/deed.de info:eu-repo/semantics/openAccess CC-BY ddc:526 article doc-type:article 2011 ftunivwuerz https://doi.org/10.5194/tcd-5-3383-2011 2022-01-01T19:07:39Z This study aimed to optimise the application, efficiency and interpretability of quasi-3D resistivity imaging for investigating the heterogeneous permafrost distribution at mountain sites by a systematic forward modelling approach. A three dimensional geocryologic model, representative for most mountain permafrost settings, was developed. Based on this geocryologic model quasi-3D models were generated by collating synthetic orthogonal 2D arrays, demonstrating the effects of array types and electrode spacing on resolution and interpretability of the inversion results. The effects of minimising the number of 2D arrays per quasi-3D grid were tested by enlarging the spacing between adjacent lines and by reducing the number of perpendicular tie lines with regard to model resolution and loss of information value. Synthetic and measured quasi-3D models were investigated with regard to the lateral and vertical resolution, reliability of inverted resistivity values, the possibility of a quantitative interpretation of resistivities and the response of the inversion process on the validity of quasi-3D models. Results show that setups using orthogonal 2D arrays with electrode spacings of 2 m and 3 m are capable of delineating lateral heterogeneity with high accuracy and also deliver reliable data on active layer thickness. Detection of permafrost thickness, especially if the permafrost base is close to the penetration depth of the setups, and the reliability of absolute resistivity values emerged to be a weakness of the method. Quasi-3D imaging has proven to be a promising tool for investigating permafrost in mountain environments especially for delineating the often small-scale permafrost heterogeneity, and therefore provides an enhanced possibility for aligning permafrost distribution with site specific surface properties and morphological settings. Article in Journal/Newspaper Active layer thickness permafrost Würzburg University: Online Publication Service |
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Open Polar |
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Würzburg University: Online Publication Service |
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ftunivwuerz |
language |
English |
topic |
ddc:526 |
spellingShingle |
ddc:526 Schwindt, Daniel Kneisel, Christof Optimisation of quasi-3D electrical resistivity imaging – application and inversion for investigating heterogeneous mountain permafrost |
topic_facet |
ddc:526 |
description |
This study aimed to optimise the application, efficiency and interpretability of quasi-3D resistivity imaging for investigating the heterogeneous permafrost distribution at mountain sites by a systematic forward modelling approach. A three dimensional geocryologic model, representative for most mountain permafrost settings, was developed. Based on this geocryologic model quasi-3D models were generated by collating synthetic orthogonal 2D arrays, demonstrating the effects of array types and electrode spacing on resolution and interpretability of the inversion results. The effects of minimising the number of 2D arrays per quasi-3D grid were tested by enlarging the spacing between adjacent lines and by reducing the number of perpendicular tie lines with regard to model resolution and loss of information value. Synthetic and measured quasi-3D models were investigated with regard to the lateral and vertical resolution, reliability of inverted resistivity values, the possibility of a quantitative interpretation of resistivities and the response of the inversion process on the validity of quasi-3D models. Results show that setups using orthogonal 2D arrays with electrode spacings of 2 m and 3 m are capable of delineating lateral heterogeneity with high accuracy and also deliver reliable data on active layer thickness. Detection of permafrost thickness, especially if the permafrost base is close to the penetration depth of the setups, and the reliability of absolute resistivity values emerged to be a weakness of the method. Quasi-3D imaging has proven to be a promising tool for investigating permafrost in mountain environments especially for delineating the often small-scale permafrost heterogeneity, and therefore provides an enhanced possibility for aligning permafrost distribution with site specific surface properties and morphological settings. |
format |
Article in Journal/Newspaper |
author |
Schwindt, Daniel Kneisel, Christof |
author_facet |
Schwindt, Daniel Kneisel, Christof |
author_sort |
Schwindt, Daniel |
title |
Optimisation of quasi-3D electrical resistivity imaging – application and inversion for investigating heterogeneous mountain permafrost |
title_short |
Optimisation of quasi-3D electrical resistivity imaging – application and inversion for investigating heterogeneous mountain permafrost |
title_full |
Optimisation of quasi-3D electrical resistivity imaging – application and inversion for investigating heterogeneous mountain permafrost |
title_fullStr |
Optimisation of quasi-3D electrical resistivity imaging – application and inversion for investigating heterogeneous mountain permafrost |
title_full_unstemmed |
Optimisation of quasi-3D electrical resistivity imaging – application and inversion for investigating heterogeneous mountain permafrost |
title_sort |
optimisation of quasi-3d electrical resistivity imaging – application and inversion for investigating heterogeneous mountain permafrost |
publishDate |
2011 |
url |
https://opus.bibliothek.uni-wuerzburg.de/frontdoor/index/index/docId/13801 https://nbn-resolving.org/urn:nbn:de:bvb:20-opus-138017 https://doi.org/10.5194/tcd-5-3383-2011 https://opus.bibliothek.uni-wuerzburg.de/files/13801/Schwindt_tcd-5-3383-2011.pdf |
genre |
Active layer thickness permafrost |
genre_facet |
Active layer thickness permafrost |
op_relation |
https://opus.bibliothek.uni-wuerzburg.de/frontdoor/index/index/docId/13801 urn:nbn:de:bvb:20-opus-138017 https://nbn-resolving.org/urn:nbn:de:bvb:20-opus-138017 https://doi.org/10.5194/tcd-5-3383-2011 https://opus.bibliothek.uni-wuerzburg.de/files/13801/Schwindt_tcd-5-3383-2011.pdf |
op_rights |
https://creativecommons.org/licenses/by/3.0/de/deed.de info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/tcd-5-3383-2011 |
_version_ |
1766330619911995392 |