Articles | Volume 12, issue 6
https://doi.org/10.5194/esurf-12-1371-2024
https://doi.org/10.5194/esurf-12-1371-2024
Research article
 | 
11 Dec 2024
Research article |  | 11 Dec 2024

The Aare main overdeepening on the northern margin of the European Alps: basins, riegels, and slot canyons

Fritz Schlunegger, Edi Kissling, Dimitri Tibo Bandou, Guilhem Amin Douillet, David Mair, Urs Marti, Regina Reber, Patrick Schläfli, and Michael Alfred Schwenk

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Cited articles

Alley, R. B., Cuffey, K. M., Evenson, E. B., Strasser, J. C., Lawson, D. E., and Larson, G. J.: How glaciers entrain and transport basal sediment: physical constraints, Quaternary Sci. Rev., 16, 1017–1038, 1997. 
Alley, R. B., Cuffey, K., and Zoet, L.: Glacial erosion: Status and outlook, Ann. Glaciol., 60, 1–13, https://doi.org/10.1017/aog.2019.38, 2019. 
Anderson, R. S., Molnar, P., and Kessler, M. A.: Features of glacial valley profiles simply explained, J. Geophys. Res.-Earth, 111, F01004, https://doi.org/10.1029/2005JF000344, 2006. 
Anselmetti, F. S., Bavec, M., Crouzet, C., Fiebig, M., Gabriel, G., Preusser, F., Ravazzi, C., and DOVE scientific team: Drilling Overdeepened Alpine Valleys (ICDP-DOVE): quantifying the age, extent, and environmental impact of Alpine glaciations, Sci. Dril., 31, 51–70, https://doi.org/10.5194/sd-31-51-2022, 2022. 
Bandou, D.: Overdeepenings in the Bern region, Switzerland: Understanding their formation processes using 3D gravity forward modelling, PhD thesis, Univ. Bern, Switzerland, 381 pp., https://boristheses.unibe.ch/id/eprint/4573 (last access: 6 December 2024), 2023a. 
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Short summary
Overdeepenings are bedrock depressions filled with sediment. We combine the results of a gravity survey with drilling data to explore the morphology of such a depression beneath the city of Bern. We find that the target overdeepening comprises two basins >200 m deep. They are separated by a bedrock riegel that itself is cut by narrow canyons up to 150 m deep. We postulate that these structures formed underneath a glacier, where erosion by subglacial meltwater caused the formation of the canyons.
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