Three-Dimensional Modeling of Sediment Transport in a Narrow 90° Channel Bend
Publication: Journal of Hydraulic Engineering
Volume 131, Issue 10
Abstract
A three-dimensional numerical model was used for calculating the velocity and bed level changes over time in a 90° bended channel. The numerical model solved the Reynolds-averaged Navier-Stokes equations in three dimensions to compute the water flow and used the finite-volume method as the discretization scheme. The model predicted the turbulence, and the SIMPLE method computed the pressure. The suspended sediment transport was calculated by solving the convection diffusion equation and the bed load transport quantity was determined with an empirical formula. The model was enhanced with relations for the movement of sediment particles on steep side slopes in river bends. Located on a transversally sloping bed, a sediment particle has a lower critical shear stress than on a flat bed. Also, the direction of its movement deviates from the direction of the shear stress near the bed. These phenomenona are considered to play an important role in the morphodynamic process in sharp channel bends. The calculated velocities as well as the bed changes over time were compared with data from a physical model study and good agreement was found.
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Acknowledgment
The study was supported by the Norwegian Research Council, BeMatA Program.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 131 • Issue 10 • October 2005
Pages: 917 - 920
Copyright
© ASCE.
History
Received: Dec 30, 2003
Accepted: Dec 9, 2004
Published online: Oct 1, 2005
Published in print: Oct 2005
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