气候变化领域集成服务门户(CCPortal): UAV photogrammetry and structure from motion to assess calving dynamics at Store Glacier, a large outlet draining the Greenland ice sheet

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DOI	10.5194/tc-9-1-2015
	UAV photogrammetry and structure from motion to assess calving dynamics at Store Glacier, a large outlet draining the Greenland ice sheet
	Ryan J.C.; Hubbard A.L.; Box J.E.; Todd J.; Christoffersen P.; Carr J.R.; Holt T.O.; Snooke N.
发表日期	2015
ISSN	19940416
卷号	9 期号:1
英文摘要	This study presents the application of a cost-effective, 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, geo-tagged 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 ±1.9m 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 2.5md-1 at the margins to in excess of 16md-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. © Author(s) 2015.
学科领域	assessment method; crevasse; discharge; ice sheet; resolution; Arctic; Greenland; Greenland Ice Sheet; Store Glacier
语种	英语
scopus关键词	assessment method; crevasse; discharge; ice sheet; resolution; Arctic; Greenland; Greenland Ice Sheet; Store Glacier
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119972
作者单位	Centre for Glaciology, Institute of Geography and Earth Sciences, Aberystwyth University, Aberystwyth, SY23 3DB, United Kingdom; Department of Geology, University of Tromsø, Tromsø, 9037, Norway; Geological Survey of Denmark and Greenland, Copenhagen, Denmark; Scott Polar Research Institute, University of Cambridge, Cambridge, United Kingdom; Department of Computer Science, Aberystwyth University, Aberystwyth, SY23 3DB, United Kingdom
推荐引用方式 GB/T 7714	Ryan J.C.,Hubbard A.L.,Box J.E.,et al. UAV photogrammetry and structure from motion to assess calving dynamics at Store Glacier, a large outlet draining the Greenland ice sheet[J],2015,9(1).
APA	Ryan J.C..,Hubbard A.L..,Box J.E..,Todd J..,Christoffersen P..,...&Snooke N..(2015).UAV photogrammetry and structure from motion to assess calving dynamics at Store Glacier, a large outlet draining the Greenland ice sheet.Cryosphere,9(1).
MLA	Ryan J.C.,et al."UAV photogrammetry and structure from motion to assess calving dynamics at Store Glacier, a large outlet draining the Greenland ice sheet".Cryosphere 9.1(2015).