The 2017 catastrophic subsidence in the Dålk Glacier: Unmanned aerial survey and digital terrain analysis
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We present the first results from a study of the 2017 catastrophic subsidence in the Dålk Glacier, East Antarctica using an unmanned aerial system (UAS) and UAS-derived DEMs. The subsided portion of the Dålk Glacier and adjacent territory was surveyed in two flights, before and after the collapse. The survey was performed by Geoscan 201, a small flying-wing UAS. Aerial images have an average resolution of 6 cm. Using Agisoft PhotoScan software, we generated two DEMs with a resolution of 22 cm related to the pre- and post-collapsed glacier surface. To model the pre-collapsed subglacial cavern, one DEM was subtracted from the other. Finally, we discuss a probable mechanism of the catastrophic subsidence.
2018 ◽
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2021 ◽
Vol 10
(10)
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pp. 666
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2013 ◽
Vol 5
(6)
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pp. 907-916
2016 ◽
Vol 20
(8)
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pp. 3379-3392
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1996 ◽
Vol 184
(3-4)
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pp. 277-298
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