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Geotechnical characterization and stability analysis of subaqueous slopes in Lake Lucerne (Switzerland)

Author

Listed:
  • Anastasiia Shynkarenko

    (ETH Zürich)

  • Katrina Kremer

    (ETH Zürich
    University of Bern)

  • Sylvia Stegmann

    (University of Bremen)

  • Paolo Bergamo

    (ETH Zürich)

  • Agostiny Marrios Lontsi

    (ETH Zürich)

  • Alexander Roesner

    (University of Bremen)

  • Steffen Hammerschmidt

    (University of Bremen)

  • Achim Kopf

    (University of Bremen)

  • Donat Fäh

    (ETH Zürich)

Abstract

Tsunamis occur not only in marine settings but also in lacustrine environments. Most of the lacustrine tsunamis are caused by seismically- or aseismically-triggered mass movements. Therefore, an assessment of the stability of subaqueous slopes is crucial for tsunami hazard assessment in a lake. We selected Lake Lucerne (Switzerland) as a natural laboratory to perform an in-depth geotechnical characterization of its subaqueous slopes. This lake experienced documented tsunamis in 1601 and 1687. Some of its slopes still bear sediment volumes with a potential for tsunamigenic failure. To identify such slopes, we interpreted available reflection seismic data and analyzed the bathymetric map. Then, we performed 152 dynamic Cone Penetration Tests with pore pressure measurement (CPTu) and retrieved 49 sediment cores at different locations in the lake. These data were used to characterize the failure-prone sediments and to evaluate the present-day static stability of subaqueous slopes. Obtained results allowed the definition of three classes of slopes in terms of static stability: unstable slopes, stable slopes close to the unstable state, and stable areas. Non-deltaic slopes with thicker unconsolidated fine-grained sediment drape and moderate-to-high slope gradients (> 5–10°) have the lowest Factor of Safety. In agreement with previous studies, the failure plane for the non-deltaic slopes is embedded within the fine-grained glaciolacustrine sediments. Deltaic slopes with prevailing coarse-grained sediments mostly appear statically stable. Finally, we generalized the measured undrained shear strength profiles $${s}_{u}(z)$$ s u ( z ) into the depth-dependent power-law models. These models define the $${s}_{u}$$ s u of Lake Lucerne’s sediments and can be applied to other lakes with similar sedimentation history.

Suggested Citation

  • Anastasiia Shynkarenko & Katrina Kremer & Sylvia Stegmann & Paolo Bergamo & Agostiny Marrios Lontsi & Alexander Roesner & Steffen Hammerschmidt & Achim Kopf & Donat Fäh, 2022. "Geotechnical characterization and stability analysis of subaqueous slopes in Lake Lucerne (Switzerland)," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 113(1), pages 475-505, August.
  • Handle: RePEc:spr:nathaz:v:113:y:2022:i:1:d:10.1007_s11069-022-05310-1
    DOI: 10.1007/s11069-022-05310-1
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    References listed on IDEAS

    as
    1. Carlo Cauzzi & Donat Fäh & David J. Wald & John Clinton & Stéphane Losey & Stefan Wiemer, 2018. "ShakeMap-based prediction of earthquake-induced mass movements in Switzerland calibrated on historical observations," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 92(2), pages 1211-1235, June.
    2. Valentin Nigg & Stephan Wohlwend & Michael Hilbe & Benjamin Bellwald & Stefano C. Fabbri & Gregory F. Souza & Florian Donau & Reto Grischott & Michael Strasser & Flavio S. Anselmetti, 2021. "A tsunamigenic delta collapse and its associated tsunami deposits in and around Lake Sils, Switzerland," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 107(2), pages 1069-1103, June.
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    Cited by:

    1. Mohammadsadegh Nouri & Amin Rashidi & Masoud Montazeri Namin & Dan H. Shugar, 2023. "Submarine landslide tsunami hazard assessment for the western Makran based on a deterministic approach," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 118(2), pages 1117-1136, September.

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