Articles | Volume 24, issue 5
https://doi.org/10.5194/nhess-24-1607-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/nhess-24-1607-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Limited effect of the confluence angle and tributary gradient on Alpine confluence morphodynamics under intense sediment loads
Théo St. Pierre Ostrander
CORRESPONDING AUTHOR
Unit of Hydraulic Engineering, University of Innsbruck, 6020 Innsbruck, Austria
Thomé Kraus
Unit of Hydraulic Engineering, University of Innsbruck, 6020 Innsbruck, Austria
Bruno Mazzorana
Faculty of Sciences, Instituto de Ciencias de la Tierra, Universidad Austral de Chile, Valdivia, 5090000, Chile
Johannes Holzner
Faculty of Agricultural, Environmental and Food Sciences, Free University of Bozen-Bolzano, 39100 Bozen-Bolzano, Italy
Andrea Andreoli
Faculty of Agricultural, Environmental and Food Sciences, Free University of Bozen-Bolzano, 39100 Bozen-Bolzano, Italy
Francesco Comiti
Faculty of Agricultural, Environmental and Food Sciences, Free University of Bozen-Bolzano, 39100 Bozen-Bolzano, Italy
Bernhard Gems
Unit of Hydraulic Engineering, University of Innsbruck, 6020 Innsbruck, Austria
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The estimation of debris flow velocity and volume is a fundamental task for the development of early warning systems and other mitigation measures. This work provides a first approach for estimating the velocity and the total volume of debris flows based on the seismic signal detected with simple, low-cost geophones installed along the debris flow channel. The developed method was applied to seismic data collected at three test sites in the Alps: Gadria and Cancia (IT) and Lattenbach (AT).
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Short summary
Mountain river confluences are hazardous during localized flooding events. A physical model was used to determine the dominant controls over mountain confluences. Contrary to lowland confluences, in mountain regions, the channel discharges and (to a lesser degree) the tributary sediment concentration control morphological patterns. Applying conclusions drawn from lowland confluences could misrepresent depositional and erosional patterns and the related flood hazard at mountain river confluences.
Mountain river confluences are hazardous during localized flooding events. A physical model was...
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