Quantification of the damming and sediment trapping capacity of landslides and their dammed lakes: the example of the Hintersee landslide dam - INSU - Institut national des sciences de l'Univers
Communication Dans Un Congrès Année : 2023

Quantification of the damming and sediment trapping capacity of landslides and their dammed lakes: the example of the Hintersee landslide dam

Daniel Hölbling
Lorena Abad
Zahra Dabiri

Résumé

Perennial landslide dams interrupt the sediment connectivity of rivers. Although most landslide dams do not persist for more than a few days, those that do can exhibit significant sediment trapping capacity. While water can pass through or over the dam, the sediment load is trapped upstream of the dam until the dam breaks or gradually erodes, or is completely filled with deposits. The volume of sediment stored in this way can reach up to three times the volume of impounded water, as we find by back-analyzing the lake Hintersee in southeastern Germany. In this work, we reconstruct the pre-landslide topography using Petrel and then use the Gerris shallow-water flow solver with a Voellmy rheology to back-analyze this landslide-dammed lake in the Bavarian Alps. We test several landslide release scenarios and different landslide rheologies to obtain the best-fitting reconstruction of the dam topography. We then fill the landslide dam with water and sediment using simple slope algorithms and validate the results against the current topography. Finally, we compare the landslide deposit thicknesses, water depths, and trapped sediment thicknesses of our different scenarios in order to provide new insight into the damming and sediment trapping capacity of landslides.

Domaines

Stratigraphie
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Dates et versions

insu-04080792 , version 1 (25-04-2023)

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Anne-Laure Argentin, Thomas Hauthaler, Moritz Liebl, Jörg Robl, Stefan Hergarten, et al.. Quantification of the damming and sediment trapping capacity of landslides and their dammed lakes: the example of the Hintersee landslide dam. EGU General Assembly 2023, European Geosciences Union, Apr 2023, Vienna, Austria. pp.EGU23-9848, ⟨10.5194/egusphere-egu23-9848⟩. ⟨insu-04080792⟩
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