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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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
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:	Date Event June 2016 Published 13 March 2015 Available 27 February 2015 Accepted 30 September 2014 Submitted
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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