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Studying effect of entrainment on dynamics of debris flows using numerical simulation
, Article Computers and Geosciences ; Volume 134 , 2020 ; Manzari, M. T ; Sharif University of Technology
Elsevier Ltd
2020
Abstract
This paper studies entrainment phenomenon in debris flows using full flow (non-depth-averaged) equations and an Incompressible Smoothed Particle Hydrodynamics (ISPH) method. A viscoplastic constitutive relationship is adopted for both the overlying fluid and bed material. Collapse of a two-dimensional dry granular column on a horizontal bed consisting of entrainable dry granular material is considered as a benchmark problem. The adopted ISPH method for simulation of collapse over rigid and entrainable beds is validated using available numerical and experimental data. To quantify the effects of entrainment on dynamics of flow, the initial aspect ratio of granular column (a) is varied and the...
Debris Flow Hazard Zoning in Tehran Urban Watersheds by Two Methods
,
M.Sc. Thesis
Sharif University of Technology
;
Tajrishi, Massoud
(Supervisor)
;
Pak, Ali
(Supervisor)
Abstract
Iran like other Developing countries is prone to natural disasters. Not only these countries are situated in areas exposed to geological and climatic hazards, but they most significantly lack policies for hazard prevention and mitigation. A considerable amount of residential areas and installations in Tehran are on the mountainous hillsides, therefore the risk related to debris flows has been enlarged. Debris flows represent one of the most dangerous geomorphologic hazards that occur in mountainous areas. Their high mobility can cause damage, not only inside and adjacent to the torrent, but also on the debris fan. The main purpose of this thesis is to present a straight forward procedure to...
Numerical Simulation of 3D Landslides Using SPH Method
, Ph.D. Dissertation Sharif University of Technology ; Taghizadeh Manzari, Mehrdad (Supervisor)
Abstract
The main goal of this study is simulation of the flow-like landslide phenomenon and investigation of the effect of bed material entrainment on its behavior. Debris flows are considered as one of the types of flow-like landslides, and flow of dry granular materials on horizontal and inclined beds as a simple model of these types of flows in nature is numerically simulated. Also, in order to investigate the effect of entrainment on dynamics of flow, a bed containing granular materials is installed on horizontal and inclined beds. The governing equations of the flow are solved in the continuum context using the Smoothed Particle Hydrodynamics (SPH) method and the depth-averaged assumptions are...