im PublikationsserverTitelangaben
Altmann, Moritz ; Haas, Florian
; Rom, Jakob ; Fleischer, Fabian ; Heckmann, Tobias ; Piermattei, Livia ; Pfeiffer, Madlene ; Stark, Manuel ; Betz-Nutz, Sarah ; Becht, Michael:
Multi-decadal analysis of erosion dynamics on LIA lateral moraines in the central Eastern Alps using the SCA-model.
2021
Veranstaltung: Mid-European Geomorphology Meeting 2021, 06.-09.11.2021, Munich.
(Veranstaltungsbeitrag: Kongress/Konferenz/Symposium/Tagung, Poster)
Kurzfassung/Abstract
Since the end of the Little Ice Age (~1850), the melting of glaciers in the Alps has led to the exposure of numerous lateral moraines, which often show high morphodynamics (e.g. fluvial erosion, debris flows and landslides) due to external forces (e.g. precipitation events) and system-internal dynamics.
Here we present a long-term monitoring on lateral moraines in the central Eastern Alps (Horlachtal, Kaunertal and Martelltal) by investigating different test sites and also different time intervals (total period 1953-2019) by applying the SCA model. To generate high-resolution topographic data, we process both historical aerial photographs (from the 1950s and 1970s) using the photogrammetry/SfM approach and recent airborne LiDAR data into DEMs (and DoDs). The SCA model shows the correlation between sediment yield and the corresponding catchment size, which can be extracted from each grid cell of the modelled channels. This shows that SCA can be used as a predictor of sediment delivery from steep channels on slopes. Using an automated process in R, a pair of values (accumulated sediment yield and corresponding catchment size) is randomly extracted from each channel and a regression is calculated accordingly, which was then automatically repeated 100 times for each dataset. In addition, we analyse climate data (20CRv3 and ERA5 re-analysis data) to relate changes in morphodynamics to climate change (temperature and precipitation).
First analyses of the regression lines show mainly a decrease in the values on the Y-axis (log. mean annual sediment yield) and a decrease in the slope over the investigation period, indicating a lower sediment yield and a lower sediment yield per square metre of the test sites. In addition to these clear decreases in sediment activity at 10 test sites, we found both stagnation and an increase in morphodynamics at one test site each.
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| Publikationsform: | Veranstaltungsbeitrag (unveröffentlicht): Kongress/Konferenz/Symposium/Tagung, Poster |
|---|---|
| Sprache des Eintrags: | Englisch |
| Institutionen der Universität: | Mathematisch-Geographische Fakultät > Geographie > Lehrstuhl für Physische Geographie |
| Titel an der KU entstanden: | Ja |
| KU.edoc-ID: | 28993 |
Letzte Änderung: 30. Nov 2021 13:54
URL zu dieser Anzeige: https://edoc.ku.de/id/eprint/28993/
