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Quantitative long-term (1922 to 2021) monitoring of a large-scale landslide of a LIA lateral moraine due to glacial debuttressing


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Altmann, Moritz ; Haas, Florian ; Rom, Jakob ; Fleischer, Fabian ; Heckmann, Tobias ; Ressl, Camillo ; Becht, Michael:
Quantitative long-term (1922 to 2021) monitoring of a large-scale landslide of a LIA lateral moraine due to glacial debuttressing.
In: Journal of geomorphology. (5. Mai 2023). - 16 S.
ISSN 2628-6025 ; 2628-6017


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We present a 99-year monitoring (1922 to 2021) of a large-scale deformation of the terminal part of a Little Ice Age lateral moraine in the glacier forefield of the Gepatschferner in the Upper Kaunertal in Tyrol, Austria. The reconstruction of this large-scale landslide was carried out in high temporal and spatial resolution using 12 DEMs of differences based on 13 different Digital elevation models from several epochs and remote sensing techniques. These were generated from a stereo photogrammetric map (1922), historical aerial photographs (between 1953 and 2003) using structure-from-motion photogrammetry with multi-view-stereo and airborne Light Detection and Ranging data (between 2006 and 2021). Based on the analysis of the different epochs, the period of the main landslide could be dated between 1953 and 1971. However, landslides were detected in all the first three epochs (1922 to 1953, 1953 to 1971 and 1971 to 1983), covering a period of 61 years. In the epoch of the main landslide, there was a vertical and horizontal displacement of about 70 and 100 m, respectively, while the landslide was about 190 m wide, which results in a calculated volume of 287,537 (±2,026) m³. We assume that the instability of the slope was caused by glacial debuttressing due to the glacier retreat since the end of the Little Ice Age. During the entire period, the slope was subject to strong variations in geomorphological activity, both spatially and temporally. The landslide area shows continuous geomorphological activity over the entire study period (1922 to 2021), summing up the total volume of net erosion to about 486,000 m³.

Weitere Angaben

Schlagwörter:Airborne light detection and ranging; historical aerial photos; large-scale landslide; Little Ice Age lateral moraine; long-term change detection; structure-from-motion photogrammetry with multi-view-stereo; historical stereo photogrammetric map
Sprache des Eintrags:Englisch
Institutionen der Universität:Mathematisch-Geographische Fakultät > Geographie > Lehrstuhl für Physische Geographie
DOI / URN / ID:10.1127/jgeomorphology/2023/0779
Open Access: Freie Zugänglichkeit des Volltexts?:Ja (Förderung durch DFG-Mittel)
Verlag:Borntraeger Science Publishers
Titel an der KU entstanden:Ja
Eingestellt am: 11. Mai 2023 08:27
Letzte Änderung: 19. Jun 2024 08:44
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