UAV photogrammetry and structure from motion to assess calving dynamics at Store Glacier, a large outlet draining the Greenland ice sheet
License: Creative Commons Attribution 3.0 License. This study presents the application of a costeffective, unmanned aerial vehicle (UAV) to investigate calving dynamics at a major marine-terminating outlet glacier draining the western sector of the Greenland ice sheet. The UAV was flown over Store G...
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Online Access: | https://hdl.handle.net/10037/8814 https://doi.org/10.5194/tc-9-1-2015 |
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ftunivtroemsoe:oai:munin.uit.no:10037/8814 2023-05-15T16:21:17+02:00 UAV photogrammetry and structure from motion to assess calving dynamics at Store Glacier, a large outlet draining the Greenland ice sheet Ryan, Johnny C. Hubbard, Alun Lloyd Box, Jason E. Todd, Joe Christoffersen, Poul Carr, J. Rachel Holt, Tom O. Snooke, Neal A. 2015-01-06 https://hdl.handle.net/10037/8814 https://doi.org/10.5194/tc-9-1-2015 eng eng European Geosciences Union Norges forskningsråd: 223259 The Cryosphere 2015, 9:1-11 FRIDAID 1239557 doi:10.5194/tc-9-1-2015 1994-0424 https://hdl.handle.net/10037/8814 URN:NBN:no-uit_munin_8384 openAccess VDP::Mathematics and natural science: 400::Geosciences: 450 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 Journal article Tidsskriftartikkel Peer reviewed 2015 ftunivtroemsoe https://doi.org/10.5194/tc-9-1-2015 2021-06-25T17:54:40Z License: Creative Commons Attribution 3.0 License. This study presents the application of a costeffective, unmanned aerial vehicle (UAV) to investigate calving dynamics at a major marine-terminating outlet glacier draining the western sector of the Greenland ice sheet. The UAV was flown over Store Glacier on three sorties during summer 2013 and acquired over 2000 overlapping, geotagged images of the calving front at an ∼ 40 cm ground sampling distance. Stereo-photogrammetry applied to these images enabled the extraction of high-resolution digital elevation models (DEMs) with vertical accuracies of ± 1.9 m which were used to quantify glaciological processes from early July to late August 2013. The central zone of the calving front advanced by ∼ 500 m, whilst the lateral margins remained stable. The orientation of crevasses and the surface velocity field derived from feature tracking indicates that lateral drag is the primary resistive force and that ice flow varies across the calving front from 2.5 m d−1 at the margins to in excess of 16 m d−1 at the centreline. Ice flux through the calving front is 3.8 × 107 m3 d −1 , equivalent to 13.9 Gt a−1 and comparable to flux-gate estimates of Store Glacier’s annual discharge. Water-filled crevasses were present throughout the observation period but covered a limited area of between 0.025 and 0.24 % of the terminus and did not appear to exert any significant control over fracture or calving. We conclude that the use of repeat UAV surveys coupled with the processing techniques outlined in this paper have great potential for elucidating the complex frontal dynamics that characterise large calving outlet glaciers. Article in Journal/Newspaper glacier Greenland Ice Sheet The Cryosphere University of Tromsø: Munin Open Research Archive Greenland The Cryosphere 9 1 1 11 |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Mathematics and natural science: 400::Geosciences: 450 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 |
spellingShingle |
VDP::Mathematics and natural science: 400::Geosciences: 450 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 Ryan, Johnny C. Hubbard, Alun Lloyd Box, Jason E. Todd, Joe Christoffersen, Poul Carr, J. Rachel Holt, Tom O. Snooke, Neal A. UAV photogrammetry and structure from motion to assess calving dynamics at Store Glacier, a large outlet draining the Greenland ice sheet |
topic_facet |
VDP::Mathematics and natural science: 400::Geosciences: 450 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 |
description |
License: Creative Commons Attribution 3.0 License. This study presents the application of a costeffective, unmanned aerial vehicle (UAV) to investigate calving dynamics at a major marine-terminating outlet glacier draining the western sector of the Greenland ice sheet. The UAV was flown over Store Glacier on three sorties during summer 2013 and acquired over 2000 overlapping, geotagged images of the calving front at an ∼ 40 cm ground sampling distance. Stereo-photogrammetry applied to these images enabled the extraction of high-resolution digital elevation models (DEMs) with vertical accuracies of ± 1.9 m which were used to quantify glaciological processes from early July to late August 2013. The central zone of the calving front advanced by ∼ 500 m, whilst the lateral margins remained stable. The orientation of crevasses and the surface velocity field derived from feature tracking indicates that lateral drag is the primary resistive force and that ice flow varies across the calving front from 2.5 m d−1 at the margins to in excess of 16 m d−1 at the centreline. Ice flux through the calving front is 3.8 × 107 m3 d −1 , equivalent to 13.9 Gt a−1 and comparable to flux-gate estimates of Store Glacier’s annual discharge. Water-filled crevasses were present throughout the observation period but covered a limited area of between 0.025 and 0.24 % of the terminus and did not appear to exert any significant control over fracture or calving. We conclude that the use of repeat UAV surveys coupled with the processing techniques outlined in this paper have great potential for elucidating the complex frontal dynamics that characterise large calving outlet glaciers. |
format |
Article in Journal/Newspaper |
author |
Ryan, Johnny C. Hubbard, Alun Lloyd Box, Jason E. Todd, Joe Christoffersen, Poul Carr, J. Rachel Holt, Tom O. Snooke, Neal A. |
author_facet |
Ryan, Johnny C. Hubbard, Alun Lloyd Box, Jason E. Todd, Joe Christoffersen, Poul Carr, J. Rachel Holt, Tom O. Snooke, Neal A. |
author_sort |
Ryan, Johnny C. |
title |
UAV photogrammetry and structure from motion to assess calving dynamics at Store Glacier, a large outlet draining the Greenland ice sheet |
title_short |
UAV photogrammetry and structure from motion to assess calving dynamics at Store Glacier, a large outlet draining the Greenland ice sheet |
title_full |
UAV photogrammetry and structure from motion to assess calving dynamics at Store Glacier, a large outlet draining the Greenland ice sheet |
title_fullStr |
UAV photogrammetry and structure from motion to assess calving dynamics at Store Glacier, a large outlet draining the Greenland ice sheet |
title_full_unstemmed |
UAV photogrammetry and structure from motion to assess calving dynamics at Store Glacier, a large outlet draining the Greenland ice sheet |
title_sort |
uav photogrammetry and structure from motion to assess calving dynamics at store glacier, a large outlet draining the greenland ice sheet |
publisher |
European Geosciences Union |
publishDate |
2015 |
url |
https://hdl.handle.net/10037/8814 https://doi.org/10.5194/tc-9-1-2015 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
glacier Greenland Ice Sheet The Cryosphere |
genre_facet |
glacier Greenland Ice Sheet The Cryosphere |
op_relation |
Norges forskningsråd: 223259 The Cryosphere 2015, 9:1-11 FRIDAID 1239557 doi:10.5194/tc-9-1-2015 1994-0424 https://hdl.handle.net/10037/8814 URN:NBN:no-uit_munin_8384 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.5194/tc-9-1-2015 |
container_title |
The Cryosphere |
container_volume |
9 |
container_issue |
1 |
container_start_page |
1 |
op_container_end_page |
11 |
_version_ |
1766009292385681408 |