DOI: 10.5194/tc-11-911-2017
Scopus记录号: 2-s2.0-85017530164
论文题名: Initiation of a major calving event on the Bowdoin Glacier captured by UAV photogrammetry
作者: Jouvet G ; , Weidmann Y ; , Seguinot J ; , Funk M ; , Abe T ; , Sakakibara D ; , Seddik H ; , Sugiyama S
刊名: Cryosphere
ISSN: 19940416
出版年: 2017
卷: 11, 期: 2 起始页码: 911
结束页码: 921
语种: 英语
英文关键词: bedrock
; flow modeling
; glacier dynamics
; ice flow
; iceberg calving
; orthophoto
; photogrammetry
; satellite imagery
; strain rate
; unmanned vehicle
; Arctic
; Greenland
英文摘要: 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. © 2017 The Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75573
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: ETHZ, VAW, Zurich, Switzerland; Graduate School of Science, Hokkaido University, Sapporo, Japan; Institute of Low Temperature Science, Hokkaido University, Sapporo, Japan
Recommended Citation:
Jouvet G,, Weidmann Y,, Seguinot J,et al. Initiation of a major calving event on the Bowdoin Glacier captured by UAV photogrammetry[J]. Cryosphere,2017-01-01,11(2)