Initiation of a major calving event on the Bowdoin Glacier captured by UAV photogrammetry
In this paper, we analyse the calving activity of the Bowdoin Glacier, north-western Greenland, in 2015 by combining satellite images, UAV (unmanned aerial vehicle) photogrammetry and ice flow modelling. In particular, a high-resolution displacement field is inferred from UAV orthoimages taken immed...
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ftdoajarticles:oai:doaj.org/article:f37831b16f2b4df38ce85648ba5761b1 2023-05-15T16:21:17+02:00 Initiation of a major calving event on the Bowdoin Glacier captured by UAV photogrammetry G. Jouvet Y. Weidmann J. Seguinot M. Funk T. Abe D. Sakakibara H. Seddik S. Sugiyama 2017-04-01T00:00:00Z https://doi.org/10.5194/tc-11-911-2017 https://doaj.org/article/f37831b16f2b4df38ce85648ba5761b1 EN eng Copernicus Publications http://www.the-cryosphere.net/11/911/2017/tc-11-911-2017.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 doi:10.5194/tc-11-911-2017 https://doaj.org/article/f37831b16f2b4df38ce85648ba5761b1 The Cryosphere, Vol 11, Iss 2, Pp 911-921 (2017) Environmental sciences GE1-350 Geology QE1-996.5 article 2017 ftdoajarticles https://doi.org/10.5194/tc-11-911-2017 2022-12-31T01:05:37Z In this paper, we analyse the calving activity of the Bowdoin Glacier, north-western Greenland, in 2015 by combining satellite images, UAV (unmanned aerial vehicle) photogrammetry and ice flow modelling. In particular, a high-resolution displacement field is inferred from UAV orthoimages taken immediately before and after the initiation of a large fracture, which induced a major calving event. A detailed analysis of the strain rate field allows us to accurately map the path taken by the opening crack. Modelling results reveal (i) that the crack was more than half-thickness deep, filled with water and getting irreversibly deeper when it was captured by the UAV and (ii) that the crack initiated in an area of high horizontal shear caused by a local basal bump immediately behind the current calving front. The asymmetry of the bed at the front explains the systematic calving pattern observed in May and July–August 2015. As a corollary, we infer that the calving front of the Bowdoin Glacier is currently stabilized by this bedrock bump and might enter into an unstable mode and retreat rapidly if the glacier keeps thinning in the coming years. Beyond this outcome, our study demonstrates that the combination of UAV photogrammetry and ice flow modelling is a promising tool to horizontally and vertically track the propagation of fractures responsible for large calving events. Article in Journal/Newspaper glacier Greenland The Cryosphere Directory of Open Access Journals: DOAJ Articles Bowdoin ENVELOPE(-69.317,-69.317,77.683,77.683) Greenland The Cryosphere 11 2 911 921 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 G. Jouvet Y. Weidmann J. Seguinot M. Funk T. Abe D. Sakakibara H. Seddik S. Sugiyama Initiation of a major calving event on the Bowdoin Glacier captured by UAV photogrammetry |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
In this paper, we analyse the calving activity of the Bowdoin Glacier, north-western Greenland, in 2015 by combining satellite images, UAV (unmanned aerial vehicle) photogrammetry and ice flow modelling. In particular, a high-resolution displacement field is inferred from UAV orthoimages taken immediately before and after the initiation of a large fracture, which induced a major calving event. A detailed analysis of the strain rate field allows us to accurately map the path taken by the opening crack. Modelling results reveal (i) that the crack was more than half-thickness deep, filled with water and getting irreversibly deeper when it was captured by the UAV and (ii) that the crack initiated in an area of high horizontal shear caused by a local basal bump immediately behind the current calving front. The asymmetry of the bed at the front explains the systematic calving pattern observed in May and July–August 2015. As a corollary, we infer that the calving front of the Bowdoin Glacier is currently stabilized by this bedrock bump and might enter into an unstable mode and retreat rapidly if the glacier keeps thinning in the coming years. Beyond this outcome, our study demonstrates that the combination of UAV photogrammetry and ice flow modelling is a promising tool to horizontally and vertically track the propagation of fractures responsible for large calving events. |
format |
Article in Journal/Newspaper |
author |
G. Jouvet Y. Weidmann J. Seguinot M. Funk T. Abe D. Sakakibara H. Seddik S. Sugiyama |
author_facet |
G. Jouvet Y. Weidmann J. Seguinot M. Funk T. Abe D. Sakakibara H. Seddik S. Sugiyama |
author_sort |
G. Jouvet |
title |
Initiation of a major calving event on the Bowdoin Glacier captured by UAV photogrammetry |
title_short |
Initiation of a major calving event on the Bowdoin Glacier captured by UAV photogrammetry |
title_full |
Initiation of a major calving event on the Bowdoin Glacier captured by UAV photogrammetry |
title_fullStr |
Initiation of a major calving event on the Bowdoin Glacier captured by UAV photogrammetry |
title_full_unstemmed |
Initiation of a major calving event on the Bowdoin Glacier captured by UAV photogrammetry |
title_sort |
initiation of a major calving event on the bowdoin glacier captured by uav photogrammetry |
publisher |
Copernicus Publications |
publishDate |
2017 |
url |
https://doi.org/10.5194/tc-11-911-2017 https://doaj.org/article/f37831b16f2b4df38ce85648ba5761b1 |
long_lat |
ENVELOPE(-69.317,-69.317,77.683,77.683) |
geographic |
Bowdoin Greenland |
geographic_facet |
Bowdoin Greenland |
genre |
glacier Greenland The Cryosphere |
genre_facet |
glacier Greenland The Cryosphere |
op_source |
The Cryosphere, Vol 11, Iss 2, Pp 911-921 (2017) |
op_relation |
http://www.the-cryosphere.net/11/911/2017/tc-11-911-2017.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 doi:10.5194/tc-11-911-2017 https://doaj.org/article/f37831b16f2b4df38ce85648ba5761b1 |
op_doi |
https://doi.org/10.5194/tc-11-911-2017 |
container_title |
The Cryosphere |
container_volume |
11 |
container_issue |
2 |
container_start_page |
911 |
op_container_end_page |
921 |
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1766009299283214336 |