Characterization of subglacial marginal channels using 3-D analysis of high-density ground-penetrating radar data
Studying subglacial drainage networks is important for understanding the potential relationship between channel dynamics and rapid glacier recession as well as the role of subglacial channels in subglacial sediment evacuation. In order to delineate the planform geometry of snout marginal subglacial...
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Cambridge University Press
2021
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ftdoajarticles:oai:doaj.org/article:04142c8760614512bfee49ea4faca124 2023-05-15T16:57:34+02:00 Characterization of subglacial marginal channels using 3-D analysis of high-density ground-penetrating radar data Pascal E. Egli James Irving Stuart N. Lane 2021-08-01T00:00:00Z https://doi.org/10.1017/jog.2021.26 https://doaj.org/article/04142c8760614512bfee49ea4faca124 EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0022143021000265/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2021.26 0022-1430 1727-5652 https://doaj.org/article/04142c8760614512bfee49ea4faca124 Journal of Glaciology, Vol 67, Pp 759-772 (2021) Glacial geomorphology glacier hydrology ground-penetrating radar mountain glaciers subglacial processes Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article 2021 ftdoajarticles https://doi.org/10.1017/jog.2021.26 2023-03-12T01:30:57Z Studying subglacial drainage networks is important for understanding the potential relationship between channel dynamics and rapid glacier recession as well as the role of subglacial channels in subglacial sediment evacuation. In order to delineate the planform geometry of snout marginal subglacial channels, densely spaced ground-penetrating radar (GPR) measurements at a frequency of ~70 MHz were carried out over the snout marginal zones of two temperate glaciers in the southwestern Swiss Alps, the Haut Glacier d'Arolla and the Glacier d'Otemma. Three-dimensional (3-D) data processing and amplitude analysis of the GPR reflection along the glacier bed was used to map the channels. At the Haut Glacier d'Arolla, two relatively straight channels of several meters in width were identified. The positions of these channels correspond well with the locations of channel outlets at the glacier terminus, as well as with fractures appearing on the glacier surface one month after the GPR data acquisition. The latter are believed to represent the beginning of ice collapse above the subglacial channels. At the Glacier d'Otemma, a major subglacial conduit was detected with similar dimensions to those identified at the Haut Glacier d'Arolla, but greater sinuosity. The position of this channel was confirmed by drone-based imagery acquired after glacier margin collapse. Our results confirm that high-density 3-D GPR surveys can be used to map subglacial channels near temperate alpine glacier margins. Article in Journal/Newspaper Journal of Glaciology Directory of Open Access Journals: DOAJ Articles Journal of Glaciology 67 264 759 772 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Glacial geomorphology glacier hydrology ground-penetrating radar mountain glaciers subglacial processes Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
spellingShingle |
Glacial geomorphology glacier hydrology ground-penetrating radar mountain glaciers subglacial processes Environmental sciences GE1-350 Meteorology. Climatology QC851-999 Pascal E. Egli James Irving Stuart N. Lane Characterization of subglacial marginal channels using 3-D analysis of high-density ground-penetrating radar data |
topic_facet |
Glacial geomorphology glacier hydrology ground-penetrating radar mountain glaciers subglacial processes Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
description |
Studying subglacial drainage networks is important for understanding the potential relationship between channel dynamics and rapid glacier recession as well as the role of subglacial channels in subglacial sediment evacuation. In order to delineate the planform geometry of snout marginal subglacial channels, densely spaced ground-penetrating radar (GPR) measurements at a frequency of ~70 MHz were carried out over the snout marginal zones of two temperate glaciers in the southwestern Swiss Alps, the Haut Glacier d'Arolla and the Glacier d'Otemma. Three-dimensional (3-D) data processing and amplitude analysis of the GPR reflection along the glacier bed was used to map the channels. At the Haut Glacier d'Arolla, two relatively straight channels of several meters in width were identified. The positions of these channels correspond well with the locations of channel outlets at the glacier terminus, as well as with fractures appearing on the glacier surface one month after the GPR data acquisition. The latter are believed to represent the beginning of ice collapse above the subglacial channels. At the Glacier d'Otemma, a major subglacial conduit was detected with similar dimensions to those identified at the Haut Glacier d'Arolla, but greater sinuosity. The position of this channel was confirmed by drone-based imagery acquired after glacier margin collapse. Our results confirm that high-density 3-D GPR surveys can be used to map subglacial channels near temperate alpine glacier margins. |
format |
Article in Journal/Newspaper |
author |
Pascal E. Egli James Irving Stuart N. Lane |
author_facet |
Pascal E. Egli James Irving Stuart N. Lane |
author_sort |
Pascal E. Egli |
title |
Characterization of subglacial marginal channels using 3-D analysis of high-density ground-penetrating radar data |
title_short |
Characterization of subglacial marginal channels using 3-D analysis of high-density ground-penetrating radar data |
title_full |
Characterization of subglacial marginal channels using 3-D analysis of high-density ground-penetrating radar data |
title_fullStr |
Characterization of subglacial marginal channels using 3-D analysis of high-density ground-penetrating radar data |
title_full_unstemmed |
Characterization of subglacial marginal channels using 3-D analysis of high-density ground-penetrating radar data |
title_sort |
characterization of subglacial marginal channels using 3-d analysis of high-density ground-penetrating radar data |
publisher |
Cambridge University Press |
publishDate |
2021 |
url |
https://doi.org/10.1017/jog.2021.26 https://doaj.org/article/04142c8760614512bfee49ea4faca124 |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology, Vol 67, Pp 759-772 (2021) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0022143021000265/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2021.26 0022-1430 1727-5652 https://doaj.org/article/04142c8760614512bfee49ea4faca124 |
op_doi |
https://doi.org/10.1017/jog.2021.26 |
container_title |
Journal of Glaciology |
container_volume |
67 |
container_issue |
264 |
container_start_page |
759 |
op_container_end_page |
772 |
_version_ |
1766049125434916864 |