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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : A depth-integrated sph model for flow-like landslides on a fixed cartesian coordinate system
A depth-integrated sph model for flow-like landslides on a fixed cartesian coordinate system
Author : XILIN XIA(1), QIUHUA LIANG(2)
ide is one of the most disastrous natural hazards that may lead to heavy losses of lives and properties around the world. Prediction of run-out distance and velocity using modern computer models may help assess and mitigate the catastrophic impacts by means of defining affected area and estimating the intensity of such events. Being a fully Lagrangian meshless numerical method that can trace the flow extent accurately without suffering grid distorting and twisting as the traditional mesh-based methods do, the Smoothed Particle Hydrodynamics (SPH) may provide a promising tool for simulating flow-like landslides. Currently, most of the SPH models have been reported to solve the Navier-Stokes equations, which are computationally prohibitive for large-scale simulations. In this work, a new SPH model is developed to solve the depth-averaged governing equations for flow-like landslides instead of full mathematical model to achieve adequate solution accuracy at a manageable computational cost. To facilitate practical simulations, e.g. enabling easy integration with GIS data, the governing equations are specifically derived on a fixed Cartesian coordinate system in which the vertical dimension is parallel to the direction of gravity with including the vertical acceleration which cannot be neglected in flow on steep slopes. The internal stresses and friction between flow mass and ‘channel bed’ are obtained under the Mohr-Columb assumption (i.e. shear stress is proportional to normal stress). Finally, a laboratory test has been reproduced to validate the model and satisfactory result has been obtained.Form Required :
File Size : 434,258 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 19/08/2015
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