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Topographic and geologic controls on frost cracking in Alpine rockwalls

Titelangaben

Draebing, Daniel ; Mayer, Till:
Topographic and geologic controls on frost cracking in Alpine rockwalls.
In: Journal of Geophysical Research: Earth Surface. Bd. 126 (2021) Heft 6 . - e2021JF006163.
ISSN 2169-9011
DOI: https://doi.org/10.1029/2021JF006163

Angaben zu Projekten

Projekttitel:
Offizieller Projekttitel
Projekt-ID
Predicting the effects of climate change on alpine rock slopes: Evaluation of paraglacial and periglacial drivers of rockfall in the European Alps
DR1070/1-1

Projektfinanzierung: Deutsche Forschungsgemeinschaft

Abstract

Frost weathering is a major control on rockwall erosion in alpine environments. Previous frost cracking model approaches used air temperatures as a proxy for rock temperatures to drive frost weathering simulations on rockwall and on mountain scale. Unfortunately, the thermal rockwall regime differs from air temperature due to topographic effects on insolation and insulation, which affects frost weathering model results and the predicted erosion patterns. To provide a more realistic model of the rockwall regime, we installed six temperature loggers along an altitudinal gradient in the Swiss Alps, including two logger pairs at rockwalls with opposing aspects. We used the recorded rock surface temperatures to model rock temperatures in the upper 10 m of the rockwalls and as input data to run four different frost cracking models. We mapped fracture spacing and rock strength to validate the model results. Our results showed that frost cracking models are sensitive to thermal, hydraulic and mechanical parameters that affect frost cracking magnitude but frost cracking patterns in terms of peak location and affected rock mass remained consistent between varying input parameters. Thermo-mechanical models incorporate rock strength and hydraulic properties and provided a frost cracking pattern at the rockwall scale that reflects better measured fracture spacing. At the mountain scale, these models showed a pattern of increasing frost cracking with altitude, which is contrary to purely thermal models but consistent with observations of existing rockfall studies.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Keywords: frost weathering; periglacial processes; landscape evolution; ice segregation; freeze-thaw
Institutionen der Universität: Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Lehrstuhl Geomorphologie
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Lehrstuhl Geomorphologie > Lehrstuhl Geomorphologie - Univ.-Prof. Dr. Oliver Sass
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 550 Geowissenschaften, Geologie
Eingestellt am: 25 Mai 2021 12:05
Letzte Änderung: 25 Mär 2024 11:31
URI: https://eref.uni-bayreuth.de/id/eprint/65289