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Initiation of a major calving event on the Bowdoin Glacier captured by UAV photogrammetry

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Title: Initiation of a major calving event on the Bowdoin Glacier captured by UAV photogrammetry
Authors: Jouvet, Guillaume Browse this author
Weidmann, Yvo Browse this author
Seguinot, Julien Browse this author
Funk, Martin Browse this author
Abe, Takahiro Browse this author
Sakakibara, Daiki Browse this author
Seddik, Hakime Browse this author
Sugiyama, Shin Browse this author →KAKEN DB
Issue Date: 12-Apr-2017
Publisher: Copernicus Publications
Journal Title: Cryosphere
Volume: 11
Issue: 2
Start Page: 911
End Page: 921
Publisher DOI: 10.5194/tc-11-911-2017
Abstract: 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.
Rights: http://creativecommons.org/licenses/by/3.0/
Type: article
URI: http://hdl.handle.net/2115/65918
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 杉山 慎

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