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Florinsky IV, Bliakharskii D, Popov S, Pryakhin S.2018. The 2017 catastrophic subsidence in the Dålk Glacier: Unmanned aerial survey and digital terrain analysis. PeerJ Preprints6:e27064v1https://doi.org/10.7287/peerj.preprints.27064v1
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.
This paper was presented at the Geomorphometry 2018 conference in Boulder, CO in August 2018.