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Influences Driving and Limiting the Efficacy of Ice Segregation in Alpine Rocks

Title data

Mayer, Till ; Eppes, M. ; Draebing, Daniel:
Influences Driving and Limiting the Efficacy of Ice Segregation in Alpine Rocks.
In: Geophysical Research Letters. Vol. 50 (2023) Issue 13 . - e2023GL102951.
ISSN 1944-8007
DOI: https://doi.org/10.1029/2023GL102951

Official URL: Volltext

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Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

Abstract Rockwall erosion by rockfall is largely controlled by frost weathering in high alpine environments. As alpine rock types are characterized by crack-dominated porosity and high rock strength, frost cracking observations from low strength and grain supported pore-space rocks cannot be transferred. Here, we conducted laboratory experiments on Wetterstein limestone samples with different initial crack density and saturation to test their influence on frost cracking efficacy. We exposed rocks to real-rockwall freezing conditions and monitored acoustic emissions as a proxy for cracking. To differentiate triggers of observed cracking, we modeled ice pressure and thermal stresses. Our results show initial full saturation is not a singular prerequisite for frost cracking. We also observe higher cracking rates in less-fractured rock. Finally, we find that the temperature threshold for frost cracking in alpine rocks falls below −7°C. Thus, colder, north-exposed rock faces in the Alps likely experience more frost cracking than southern-facing counterparts.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: frost weathering; frost cracking; periglacial processes; rock weathering; thermal stress; acoustic emission
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Geomorphology
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 550 Earth sciences, geology
Date Deposited: 23 Mar 2024 22:00
Last Modified: 25 Mar 2024 11:29
URI: https://eref.uni-bayreuth.de/id/eprint/89007