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...
Main Authors: | , , , |
---|---|
Language: | English |
Published: |
2018
|
Subjects: | |
Online Access: | http://doc.rero.ch/record/306740/files/hau_rcg.pdf |
id |
ftreroch:oai:doc.rero.ch:20180202114225-WN |
---|---|
record_format |
openpolar |
spelling |
ftreroch:oai:doc.rero.ch:20180202114225-WN 2023-05-15T16:36:43+02:00 Resolution capacity of geophysical monitoring regarding permafrost degradation induced by hydrological processes Mewes, Benjamin Hilbich, Christin Delaloye, Reynald Hauck, Christian 2018-02-02T10:43:46Z http://doc.rero.ch/record/306740/files/hau_rcg.pdf eng eng http://doc.rero.ch/record/306740/files/hau_rcg.pdf 2018 ftreroch 2023-02-16T17:30:19Z 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. Other/Unknown Material Ice permafrost RERO DOC Digital Library |
institution |
Open Polar |
collection |
RERO DOC Digital Library |
op_collection_id |
ftreroch |
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. |
author |
Mewes, Benjamin Hilbich, Christin Delaloye, Reynald Hauck, Christian |
spellingShingle |
Mewes, Benjamin Hilbich, Christin Delaloye, Reynald Hauck, Christian Resolution capacity of geophysical monitoring regarding permafrost degradation induced by hydrological processes |
author_facet |
Mewes, Benjamin Hilbich, Christin Delaloye, Reynald Hauck, Christian |
author_sort |
Mewes, Benjamin |
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 |
2018 |
url |
http://doc.rero.ch/record/306740/files/hau_rcg.pdf |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_relation |
http://doc.rero.ch/record/306740/files/hau_rcg.pdf |
_version_ |
1766027049294626816 |