Detection of permafrost in shallow bedrock areas with the opposing coils transient electromagnetic method
The transient electromagnetic method (TEM) is a geophysical method for detecting underground geological bodies by following the principle of electromagnetic induction, which has been widely used in permafrost exploration. In the practical applications of the TEM to investigate permafrost, it is foun...
Published in: | Frontiers in Environmental Science |
---|---|
Main Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Frontiers Media S.A.
2022
|
Subjects: | |
Online Access: | https://doi.org/10.3389/fenvs.2022.909848 https://doaj.org/article/637c5fa2e6bd40fda5ad4a629f181065 |
id |
ftdoajarticles:oai:doaj.org/article:637c5fa2e6bd40fda5ad4a629f181065 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:637c5fa2e6bd40fda5ad4a629f181065 2023-05-15T17:55:39+02:00 Detection of permafrost in shallow bedrock areas with the opposing coils transient electromagnetic method Guiqian Yang Changwei Xie Tonghua Wu Xiaodong Wu Yuxin Zhang Wu Wang Guangyue Liu 2022-08-01T00:00:00Z https://doi.org/10.3389/fenvs.2022.909848 https://doaj.org/article/637c5fa2e6bd40fda5ad4a629f181065 EN eng Frontiers Media S.A. https://www.frontiersin.org/articles/10.3389/fenvs.2022.909848/full https://doaj.org/toc/2296-665X 2296-665X doi:10.3389/fenvs.2022.909848 https://doaj.org/article/637c5fa2e6bd40fda5ad4a629f181065 Frontiers in Environmental Science, Vol 10 (2022) permafrost shallow bedrock opposing coils transient electromagnetic method TEM exploration Environmental sciences GE1-350 article 2022 ftdoajarticles https://doi.org/10.3389/fenvs.2022.909848 2022-12-30T21:12:27Z The transient electromagnetic method (TEM) is a geophysical method for detecting underground geological bodies by following the principle of electromagnetic induction, which has been widely used in permafrost exploration. In the practical applications of the TEM to investigate permafrost, it is found that in certain areas with shallow buried bedrock, the electrical resistivity near the surface cannot be obtained, and both frozen soil and underground bedrock exhibit a high electrical resistivity, so it is difficult to determine the distribution characteristics of the permafrost thickness. Based on this background, by analyzing measured data, it is considered that the reason for this situation is that the noise superposition effect generated by the receiving coil under the action of the primary field forms a shallow detection blind area. This study uses equivalent anti-flux opposing coils to eliminate the abovementioned blind area and realize measurement in the permafrost area of Mahan Mountain in Lanzhou. The results showed that the opposing coils transient electromagnetic method (OCTEM) can clearly detect low-resistivity anomalies near the boundary and permafrost base in the Mahan Mountain area, solve the problem of the shallow detection blind area of the conventional TEM, effectively eliminate the interference caused by the primary field, and greatly improve the horizontal and vertical resolutions. Article in Journal/Newspaper permafrost Directory of Open Access Journals: DOAJ Articles Mahan ENVELOPE(-140.067,-140.067,-85.533,-85.533) Frontiers in Environmental Science 10 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
permafrost shallow bedrock opposing coils transient electromagnetic method TEM exploration Environmental sciences GE1-350 |
spellingShingle |
permafrost shallow bedrock opposing coils transient electromagnetic method TEM exploration Environmental sciences GE1-350 Guiqian Yang Changwei Xie Tonghua Wu Xiaodong Wu Yuxin Zhang Wu Wang Guangyue Liu Detection of permafrost in shallow bedrock areas with the opposing coils transient electromagnetic method |
topic_facet |
permafrost shallow bedrock opposing coils transient electromagnetic method TEM exploration Environmental sciences GE1-350 |
description |
The transient electromagnetic method (TEM) is a geophysical method for detecting underground geological bodies by following the principle of electromagnetic induction, which has been widely used in permafrost exploration. In the practical applications of the TEM to investigate permafrost, it is found that in certain areas with shallow buried bedrock, the electrical resistivity near the surface cannot be obtained, and both frozen soil and underground bedrock exhibit a high electrical resistivity, so it is difficult to determine the distribution characteristics of the permafrost thickness. Based on this background, by analyzing measured data, it is considered that the reason for this situation is that the noise superposition effect generated by the receiving coil under the action of the primary field forms a shallow detection blind area. This study uses equivalent anti-flux opposing coils to eliminate the abovementioned blind area and realize measurement in the permafrost area of Mahan Mountain in Lanzhou. The results showed that the opposing coils transient electromagnetic method (OCTEM) can clearly detect low-resistivity anomalies near the boundary and permafrost base in the Mahan Mountain area, solve the problem of the shallow detection blind area of the conventional TEM, effectively eliminate the interference caused by the primary field, and greatly improve the horizontal and vertical resolutions. |
format |
Article in Journal/Newspaper |
author |
Guiqian Yang Changwei Xie Tonghua Wu Xiaodong Wu Yuxin Zhang Wu Wang Guangyue Liu |
author_facet |
Guiqian Yang Changwei Xie Tonghua Wu Xiaodong Wu Yuxin Zhang Wu Wang Guangyue Liu |
author_sort |
Guiqian Yang |
title |
Detection of permafrost in shallow bedrock areas with the opposing coils transient electromagnetic method |
title_short |
Detection of permafrost in shallow bedrock areas with the opposing coils transient electromagnetic method |
title_full |
Detection of permafrost in shallow bedrock areas with the opposing coils transient electromagnetic method |
title_fullStr |
Detection of permafrost in shallow bedrock areas with the opposing coils transient electromagnetic method |
title_full_unstemmed |
Detection of permafrost in shallow bedrock areas with the opposing coils transient electromagnetic method |
title_sort |
detection of permafrost in shallow bedrock areas with the opposing coils transient electromagnetic method |
publisher |
Frontiers Media S.A. |
publishDate |
2022 |
url |
https://doi.org/10.3389/fenvs.2022.909848 https://doaj.org/article/637c5fa2e6bd40fda5ad4a629f181065 |
long_lat |
ENVELOPE(-140.067,-140.067,-85.533,-85.533) |
geographic |
Mahan |
geographic_facet |
Mahan |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
Frontiers in Environmental Science, Vol 10 (2022) |
op_relation |
https://www.frontiersin.org/articles/10.3389/fenvs.2022.909848/full https://doaj.org/toc/2296-665X 2296-665X doi:10.3389/fenvs.2022.909848 https://doaj.org/article/637c5fa2e6bd40fda5ad4a629f181065 |
op_doi |
https://doi.org/10.3389/fenvs.2022.909848 |
container_title |
Frontiers in Environmental Science |
container_volume |
10 |
_version_ |
1766163607446355968 |