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URN to cite this document: urn:nbn:de:bvb:703-epub-7605-7
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 der Verlagsversion: https://doi.org/10.1029/2023GL102951
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Project information
| Project title: |
Project's official title Project's id Open Access Publizieren No information |
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| Project financing: |
Deutsche Forschungsgemeinschaft |
Abstract
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 |
|---|---|
| Keywords: | frost weathering; frost cracking; periglacial processes; rock weathering; thermal stress; acoustic emission |
| DDC Subjects: | 500 Science > 550 Earth sciences, geology |
| 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 |
| Language: | English |
| Originates at UBT: | Yes |
| URN: | urn:nbn:de:bvb:703-epub-7605-7 |
| Date Deposited: | 20 Mar 2024 09:16 |
| Last Modified: | 20 Mar 2024 09:17 |
| URI: | https://epub.uni-bayreuth.de/id/eprint/7605 |
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