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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Sediment management and morphodynamics : 3d numerical model of sediment transport considering transition from bed-load
3d numerical model of sediment transport considering transition from bed-load
Author : KAZUYUKI OTA(1), TAKAHIRO SATO(2) & HAJIME NAKAGAWA(3)
ABSTRACT
This study suggests a new 3D numerical model for simulating the flow and bed deformation around hydraulic structures,
considering the transition process from bed-load motion to suspension. The numerical analysis of the fluid is carried out
by solving the Reynolds-averaged Navier-Stokes (RANS) equations coupled with the Volume of Fluid (VOF) method.
The temporal change in bed topography is calculated by coupling a stochastic model of sediment pickup, deposition,
and transition and a momentum equation of sediment particles to account for the effect of non-equilibrium and transition
from bed load to suspension. The numerical model was applied to an experimental scour phenomenon upstream of a slit
weir, in which the initial bed elevation was lower than the crest elevation of the slit (i.e., all eroded particles experienced
the transition process from bed load to suspension around the slit). A comparison between the numerical results and
experimental data indicated that the model could reproduce the scour geometry around the slit weir with sufficient
accuracy.
File Size : 1,133,669 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Sediment management and morphodynamics
Date Published : 17/08/2015
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