Resolution capacity of geophysical monitoring regarding permafrost degradation induced by hydrological processes
Geophysical methods are often used to characterize and monitor the subsurface composition of permafrost. The resolution capacity of standard methods, i.e. electrical resistivity tomography and refraction seismic tomography, depends not only on static parameters such as measurement geometry, but also...
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ftubbochumdiss:oai:hss-opus.ub.ruhr-uni-bochum.de:6637 2023-05-15T16:36:43+02:00 Resolution capacity of geophysical monitoring regarding permafrost degradation induced by hydrological processes Mewes, Benjamin (M. Sc.) Hilbich, Christian Delaloye, Reynald Hauck, Christian 2017-12-14 application/pdf https://hss-opus.ub.ruhr-uni-bochum.de/opus4/frontdoor/index/index/docId/6637 https://nbn-resolving.org/urn:nbn:de:hbz:294-66370 https://hss-opus.ub.ruhr-uni-bochum.de/opus4/files/6637/MewesBenjamin.pdf eng eng https://hss-opus.ub.ruhr-uni-bochum.de/opus4/frontdoor/index/index/docId/6637 urn:nbn:de:hbz:294-66370 https://nbn-resolving.org/urn:nbn:de:hbz:294-66370 https://hss-opus.ub.ruhr-uni-bochum.de/opus4/files/6637/MewesBenjamin.pdf http://creativecommons.org/licenses/by/3.0/ info:eu-repo/semantics/openAccess CC-BY article doc-type:article 2017 ftubbochumdiss 2022-05-02T16:18:46Z Geophysical methods are often used to characterize and monitor the subsurface composition of permafrost. The resolution capacity of standard methods, i.e. electrical resistivity tomography and refraction seismic tomography, depends not only on static parameters such as measurement geometry, but also on the temporal variability in the contrast of the geophysical target variables (electrical resistivity and P-wave velocity). Our study analyses the resolution capacity of electrical resistivity tomography and refraction seismic tomography for typical processes in the context of permafrost degradation using synthetic and field data sets of mountain permafrost terrain. In addition, we tested the resolution capacity of a petrophysically based quantitative combination of both methods, the so-called 4-phase model, and through this analysed the expected changes in water and ice content upon permafrost thaw. The results from the synthetic data experiments suggest a higher sensitivity regarding an increase in water content compared to a decrease in ice content. A potentially larger uncertainty originates from the individual geophysical methods than from the combined evaluation with the 4-phase model. In the latter, a loss of ground ice can be detected quite reliably, whereas artefacts occur in the case of increased horizontal or vertical water flow. Analysis of field data from a well-investigated rock glacier in the Swiss Alps successfully visualized the seasonal ice loss in summer and the complex spatially variable ice, water and air content changes in an interannual comparison. Article in Journal/Newspaper Ice permafrost RUB-Repository (Ruhr-Universität Bochum) |
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Open Polar |
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RUB-Repository (Ruhr-Universität Bochum) |
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ftubbochumdiss |
language |
English |
description |
Geophysical methods are often used to characterize and monitor the subsurface composition of permafrost. The resolution capacity of standard methods, i.e. electrical resistivity tomography and refraction seismic tomography, depends not only on static parameters such as measurement geometry, but also on the temporal variability in the contrast of the geophysical target variables (electrical resistivity and P-wave velocity). Our study analyses the resolution capacity of electrical resistivity tomography and refraction seismic tomography for typical processes in the context of permafrost degradation using synthetic and field data sets of mountain permafrost terrain. In addition, we tested the resolution capacity of a petrophysically based quantitative combination of both methods, the so-called 4-phase model, and through this analysed the expected changes in water and ice content upon permafrost thaw. The results from the synthetic data experiments suggest a higher sensitivity regarding an increase in water content compared to a decrease in ice content. A potentially larger uncertainty originates from the individual geophysical methods than from the combined evaluation with the 4-phase model. In the latter, a loss of ground ice can be detected quite reliably, whereas artefacts occur in the case of increased horizontal or vertical water flow. Analysis of field data from a well-investigated rock glacier in the Swiss Alps successfully visualized the seasonal ice loss in summer and the complex spatially variable ice, water and air content changes in an interannual comparison. |
format |
Article in Journal/Newspaper |
author |
Mewes, Benjamin (M. Sc.) Hilbich, Christian Delaloye, Reynald Hauck, Christian |
spellingShingle |
Mewes, Benjamin (M. Sc.) Hilbich, Christian Delaloye, Reynald Hauck, Christian Resolution capacity of geophysical monitoring regarding permafrost degradation induced by hydrological processes |
author_facet |
Mewes, Benjamin (M. Sc.) Hilbich, Christian Delaloye, Reynald Hauck, Christian |
author_sort |
Mewes, Benjamin (M. Sc.) |
title |
Resolution capacity of geophysical monitoring regarding permafrost degradation induced by hydrological processes |
title_short |
Resolution capacity of geophysical monitoring regarding permafrost degradation induced by hydrological processes |
title_full |
Resolution capacity of geophysical monitoring regarding permafrost degradation induced by hydrological processes |
title_fullStr |
Resolution capacity of geophysical monitoring regarding permafrost degradation induced by hydrological processes |
title_full_unstemmed |
Resolution capacity of geophysical monitoring regarding permafrost degradation induced by hydrological processes |
title_sort |
resolution capacity of geophysical monitoring regarding permafrost degradation induced by hydrological processes |
publishDate |
2017 |
url |
https://hss-opus.ub.ruhr-uni-bochum.de/opus4/frontdoor/index/index/docId/6637 https://nbn-resolving.org/urn:nbn:de:hbz:294-66370 https://hss-opus.ub.ruhr-uni-bochum.de/opus4/files/6637/MewesBenjamin.pdf |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_relation |
https://hss-opus.ub.ruhr-uni-bochum.de/opus4/frontdoor/index/index/docId/6637 urn:nbn:de:hbz:294-66370 https://nbn-resolving.org/urn:nbn:de:hbz:294-66370 https://hss-opus.ub.ruhr-uni-bochum.de/opus4/files/6637/MewesBenjamin.pdf |
op_rights |
http://creativecommons.org/licenses/by/3.0/ info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
_version_ |
1766027048960131072 |