The 2017 catastrophic subsidence in the Dålk Glacier: Unmanned aerial survey and digital terrain analysis
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. T...
Main Authors: | , , , |
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Format: | Other/Unknown Material |
Language: | unknown |
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PeerJ
2018
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Subjects: | |
Online Access: | http://dx.doi.org/10.7287/peerj.preprints.27064v1 https://peerj.com/preprints/27064v1.pdf https://peerj.com/preprints/27064v1.xml https://peerj.com/preprints/27064v1.html |
Summary: | 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. |
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