Geophysical Methods for Detecting Permafrost Discontinuities
Global climate change has sparked various concerns over the future of the Arctic. One of the major concerns around the environmental and ecological health of the Arctic is directly related to the deterioration of the permafrost. Permafrost is described as frozen soil below 0oC for at least two conse...
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2021
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ftunivwaterloo:oai:uwspace.uwaterloo.ca:10012/16841 2023-05-15T15:01:48+02:00 Geophysical Methods for Detecting Permafrost Discontinuities Salman, Max 2021-02-26 http://hdl.handle.net/10012/16841 en eng University of Waterloo http://hdl.handle.net/10012/16841 geophysics permafrost electrical resistivity tomography electromagnetic induction Northern Master Thesis 2021 ftunivwaterloo 2022-06-18T23:03:14Z Global climate change has sparked various concerns over the future of the Arctic. One of the major concerns around the environmental and ecological health of the Arctic is directly related to the deterioration of the permafrost. Permafrost is described as frozen soil below 0oC for at least two consecutive years, and is recognized by the World Meteorological Organization (WMO) as an Essential Climate Variable (ECV). Geophysical methods have been used to detect and measure the extent of the permafrost in various cold regions of the Earth. Traditional methods such as electrical resistivity tomography (ERT), electro magnetic induction (EMI), and seismic have all been used to characterize permafrost in the subsurface. However, there are smaller scale features at the near surface requiring attention. In this work, we used of a permafrost probe, an electrical resistivity tomography system, and an electromagnetic induction system to measure the depth to the permafrost table from the ground surface. The study was performed in the Sahtu Region of the Northwest Territories, approximately 30 kilometers south of the Town of Norman Wells, Northwest Territories. Two sites were selected; one on a drill pad, one near a lake shore. The soils mainly consisted of homogeneous organic-rich till. The permafrost probe measure a depth to permafrost table of approximately 70 centimeters at the drill-pad site (MW04T) and approximately 30 centimeters at the lake shore site (Marg Lake). A Syscal Junior 48TM ERT system was installed perpendicular to the topological features, such as the lake shore, and the tree line. The electrode spacing was small due to the shallow nature of the permafrost, and the dipole-dipole method was selected to collect measurements. The ERT data was inverted using Res2DInvTM and the output data correlates well with the permafrost probe measurements. A ground conductivity meter (GCM) was used to assess the capability of using a non-ground-coupled geophysical methods in this terrain to detect permafrost discontinuity. ... Master Thesis Arctic Climate change Northwest Territories permafrost University of Waterloo, Canada: Institutional Repository Arctic Northwest Territories Norman Wells ENVELOPE(-126.833,-126.833,65.282,65.282) Sahtu Region ENVELOPE(-126.852,-126.852,65.284,65.284) |
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Open Polar |
collection |
University of Waterloo, Canada: Institutional Repository |
op_collection_id |
ftunivwaterloo |
language |
English |
topic |
geophysics permafrost electrical resistivity tomography electromagnetic induction Northern |
spellingShingle |
geophysics permafrost electrical resistivity tomography electromagnetic induction Northern Salman, Max Geophysical Methods for Detecting Permafrost Discontinuities |
topic_facet |
geophysics permafrost electrical resistivity tomography electromagnetic induction Northern |
description |
Global climate change has sparked various concerns over the future of the Arctic. One of the major concerns around the environmental and ecological health of the Arctic is directly related to the deterioration of the permafrost. Permafrost is described as frozen soil below 0oC for at least two consecutive years, and is recognized by the World Meteorological Organization (WMO) as an Essential Climate Variable (ECV). Geophysical methods have been used to detect and measure the extent of the permafrost in various cold regions of the Earth. Traditional methods such as electrical resistivity tomography (ERT), electro magnetic induction (EMI), and seismic have all been used to characterize permafrost in the subsurface. However, there are smaller scale features at the near surface requiring attention. In this work, we used of a permafrost probe, an electrical resistivity tomography system, and an electromagnetic induction system to measure the depth to the permafrost table from the ground surface. The study was performed in the Sahtu Region of the Northwest Territories, approximately 30 kilometers south of the Town of Norman Wells, Northwest Territories. Two sites were selected; one on a drill pad, one near a lake shore. The soils mainly consisted of homogeneous organic-rich till. The permafrost probe measure a depth to permafrost table of approximately 70 centimeters at the drill-pad site (MW04T) and approximately 30 centimeters at the lake shore site (Marg Lake). A Syscal Junior 48TM ERT system was installed perpendicular to the topological features, such as the lake shore, and the tree line. The electrode spacing was small due to the shallow nature of the permafrost, and the dipole-dipole method was selected to collect measurements. The ERT data was inverted using Res2DInvTM and the output data correlates well with the permafrost probe measurements. A ground conductivity meter (GCM) was used to assess the capability of using a non-ground-coupled geophysical methods in this terrain to detect permafrost discontinuity. ... |
format |
Master Thesis |
author |
Salman, Max |
author_facet |
Salman, Max |
author_sort |
Salman, Max |
title |
Geophysical Methods for Detecting Permafrost Discontinuities |
title_short |
Geophysical Methods for Detecting Permafrost Discontinuities |
title_full |
Geophysical Methods for Detecting Permafrost Discontinuities |
title_fullStr |
Geophysical Methods for Detecting Permafrost Discontinuities |
title_full_unstemmed |
Geophysical Methods for Detecting Permafrost Discontinuities |
title_sort |
geophysical methods for detecting permafrost discontinuities |
publisher |
University of Waterloo |
publishDate |
2021 |
url |
http://hdl.handle.net/10012/16841 |
long_lat |
ENVELOPE(-126.833,-126.833,65.282,65.282) ENVELOPE(-126.852,-126.852,65.284,65.284) |
geographic |
Arctic Northwest Territories Norman Wells Sahtu Region |
geographic_facet |
Arctic Northwest Territories Norman Wells Sahtu Region |
genre |
Arctic Climate change Northwest Territories permafrost |
genre_facet |
Arctic Climate change Northwest Territories permafrost |
op_relation |
http://hdl.handle.net/10012/16841 |
_version_ |
1766333815576330240 |