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Rockslide and impulse wave modelling in the Vajont Reservoir by DEM-CFD analyses
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Zhao, Tao, Utili, Stefano and Crosta, Giovanni B. (2016) Rockslide and impulse wave modelling in the Vajont Reservoir by DEM-CFD analyses. Rock Mechanics and Rock Engineering, 49 (6). pp. 2437-2456. doi:10.1007/s00603-015-0731-0 ISSN 0723-2632.
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Official URL: http://dx.doi.org/10.1007/s00603-015-0731-0
Abstract
This paper investigates the generation of hydrodynamic water waves due to rockslides plunging into a water reservoir. Quasi-3D DEM analyses in plane strain by a coupled DEM-CFD code are adopted to simulate the rockslide from its onset to the impact with the still water and the subsequent generation of the wave. The employed numerical tools and upscaling of hydraulic properties allow predicting a physical response in broad agreement with the observations notwithstanding the assumptions and characteristics of the adopted methods. The results obtained by the DEM-CFD coupled approach are compared to those published in the literature and those presented by Crosta et al. (Landslide spreading, impulse waves and modelling of the Vajont rockslide. Rock mechanics, 2014) in a companion paper obtained through an ALE-FEM method. Analyses performed along two cross sections are representative of the limit conditions of the eastern and western slope sectors. The max rockslide average velocity and the water wave velocity reach ca. 22 and 20 m/s, respectively. The maximum computed run up amounts to ca. 120 and 170 m for the eastern and western lobe cross sections, respectively. These values are reasonably similar to those recorded during the event (i.e. ca. 130 and 190 m, respectively). Therefore, the overall study lays out a possible DEM-CFD framework for the modelling of the generation of the hydrodynamic wave due to the impact of a rapid moving rockslide or rock–debris avalanche.
Item Type: | Journal Article | ||||||||||
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Subjects: | T Technology > TC Hydraulic engineering. Ocean engineering | ||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||||||||
Library of Congress Subject Headings (LCSH): | Rockslides, Water waves, Discrete element method | ||||||||||
Journal or Publication Title: | Rock Mechanics and Rock Engineering | ||||||||||
Publisher: | Springer Wien | ||||||||||
ISSN: | 0723-2632 | ||||||||||
Official Date: | June 2016 | ||||||||||
Dates: |
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Volume: | 49 | ||||||||||
Number: | 6 | ||||||||||
Page Range: | pp. 2437-2456 | ||||||||||
DOI: | 10.1007/s00603-015-0731-0 | ||||||||||
Status: | Peer Reviewed | ||||||||||
Publication Status: | Published | ||||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||||
Date of first compliant deposit: | 30 December 2015 | ||||||||||
Date of first compliant Open Access: | 16 March 2016 | ||||||||||
Funder: | Marie Skłodowska-Curie actions, Italy. Ministero dell'istruzione, dell'università e della ricerca (MIUR) | ||||||||||
Grant number: | 294976 (MSCA) |
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