WCSPH with Limiting Viscosity for Modeling Landslide Hazard at the Slopes of Artificial Reservoir

This work illustrated an application of the FOSS code SPHERA v.8.0 (RSE SpA, Milano, Italy) to the simulation of landslide hazard at the slope of a water basin. SPHERA is based on the weakly compressible SPH method (WCSPH) and holds a mixture model, consistent with the packing limit of the Kinetic T...

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Main Authors: Sauro Manenti, Andrea Amicarelli, Sara Todeschini
Format: Article
Language:English
Published: MDPI AG 2018-04-01
Series:Water
Subjects:
Online Access:http://www.mdpi.com/2073-4441/10/4/515
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spelling doaj-afffd8c360614bbc851931c79ce756a12020-11-24T21:31:58ZengMDPI AGWater2073-44412018-04-0110451510.3390/w10040515w10040515WCSPH with Limiting Viscosity for Modeling Landslide Hazard at the Slopes of Artificial ReservoirSauro Manenti0Andrea Amicarelli1Sara Todeschini2Department of Civil Engineering and Architecture (DICAr), University of Pavia, via Ferrata n. 3, 27100 Pavia, ItalyDepartment SFE, Research Institute, Government Property, MEF (RSE SpA), via Rubattino n. 54, 20134 Milano, ItalyDepartment of Civil Engineering and Architecture (DICAr), University of Pavia, via Ferrata n. 3, 27100 Pavia, ItalyThis work illustrated an application of the FOSS code SPHERA v.8.0 (RSE SpA, Milano, Italy) to the simulation of landslide hazard at the slope of a water basin. SPHERA is based on the weakly compressible SPH method (WCSPH) and holds a mixture model, consistent with the packing limit of the Kinetic Theory of Granular Flow (KTGF), which was previously tested for simulating two-phase free-surface rapid flows involving water-sediment interaction. In this study a limiting viscosity parameter was implemented in the previous formulation of the mixture model to limit the growth of the apparent viscosity, thus saving computational time while preserving the solution accuracy. This approach is consistent with the experimental behavior of high polymer solutions for which an almost constant value of viscosity may be approached at very low deformation rates near the transition zone of elastic–plastic regime. In this application, the limiting viscosity was used as a numerical parameter for optimization of the computation. Some preliminary tests were performed by simulating a 2D erosional dam break, proving that a proper selection of the limiting viscosity leads to a considerable drop of the computational time without altering significantly the numerical solution. SPHERA was then validated by simulating a 2D scale experiment reproducing the early phase of the Vajont landslide when a tsunami wave was generated that climbed the opposite mountain side with a maximum run-up of about 270 m. The obtained maximum run-up was very close to the experimental result. Influence of saturation of the landslide material below the still water level was also accounted, showing that the landslide dynamics can be better represented and the wave run-up can be properly estimated.http://www.mdpi.com/2073-4441/10/4/515SPH methodVajont landslideartificial basinpost-failuretsunami waveexperimental validation
collection DOAJ
language English
format Article
sources DOAJ
author Sauro Manenti
Andrea Amicarelli
Sara Todeschini
spellingShingle Sauro Manenti
Andrea Amicarelli
Sara Todeschini
WCSPH with Limiting Viscosity for Modeling Landslide Hazard at the Slopes of Artificial Reservoir
Water
SPH method
Vajont landslide
artificial basin
post-failure
tsunami wave
experimental validation
author_facet Sauro Manenti
Andrea Amicarelli
Sara Todeschini
author_sort Sauro Manenti
title WCSPH with Limiting Viscosity for Modeling Landslide Hazard at the Slopes of Artificial Reservoir
title_short WCSPH with Limiting Viscosity for Modeling Landslide Hazard at the Slopes of Artificial Reservoir
title_full WCSPH with Limiting Viscosity for Modeling Landslide Hazard at the Slopes of Artificial Reservoir
title_fullStr WCSPH with Limiting Viscosity for Modeling Landslide Hazard at the Slopes of Artificial Reservoir
title_full_unstemmed WCSPH with Limiting Viscosity for Modeling Landslide Hazard at the Slopes of Artificial Reservoir
title_sort wcsph with limiting viscosity for modeling landslide hazard at the slopes of artificial reservoir
publisher MDPI AG
series Water
issn 2073-4441
publishDate 2018-04-01
description This work illustrated an application of the FOSS code SPHERA v.8.0 (RSE SpA, Milano, Italy) to the simulation of landslide hazard at the slope of a water basin. SPHERA is based on the weakly compressible SPH method (WCSPH) and holds a mixture model, consistent with the packing limit of the Kinetic Theory of Granular Flow (KTGF), which was previously tested for simulating two-phase free-surface rapid flows involving water-sediment interaction. In this study a limiting viscosity parameter was implemented in the previous formulation of the mixture model to limit the growth of the apparent viscosity, thus saving computational time while preserving the solution accuracy. This approach is consistent with the experimental behavior of high polymer solutions for which an almost constant value of viscosity may be approached at very low deformation rates near the transition zone of elastic–plastic regime. In this application, the limiting viscosity was used as a numerical parameter for optimization of the computation. Some preliminary tests were performed by simulating a 2D erosional dam break, proving that a proper selection of the limiting viscosity leads to a considerable drop of the computational time without altering significantly the numerical solution. SPHERA was then validated by simulating a 2D scale experiment reproducing the early phase of the Vajont landslide when a tsunami wave was generated that climbed the opposite mountain side with a maximum run-up of about 270 m. The obtained maximum run-up was very close to the experimental result. Influence of saturation of the landslide material below the still water level was also accounted, showing that the landslide dynamics can be better represented and the wave run-up can be properly estimated.
topic SPH method
Vajont landslide
artificial basin
post-failure
tsunami wave
experimental validation
url http://www.mdpi.com/2073-4441/10/4/515
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