Three-Dimensional Modeling of Nonuniform Sediment Transport in an S-Shaped Channel
Publication: Journal of Hydraulic Engineering
Volume 137, Issue 4
Abstract
A three-dimensional numerical model was applied to compute uniform and nonuniform sediment transport and bed deformation in an S-shaped laboratory channel located at the University of Innsbruck, where detailed measurements of the velocity field and bed elevation changes were made. The channel had two bends, a trapezoidal cross section, and a slope of . Gravel with a mean diameter of 4.2 mm was used as movable bed material and for sediment feeding. Wu’s formula for multiple grain sizes was compared with van Rijn’s formula using one grain size. Fairly good agreement was found between the computed and measured bed elevations for both approaches, whereas Wu’s formula could further improve the numerical results. Looking at the physics of the erosion pattern, the computed scour areas were located slightly more downstream than what was observed in the physical model. The current study also includes several parameter tests: grid distribution in vertical, lateral, and longitudinal direction; time step; number of inner iterations/time step; active sediment layer thickness; and the Shields coefficient. The variation of those parameters gave some differences in the results, but the overall pattern of bed elevation changes remained the same.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 137 • Issue 4 • April 2011
Pages: 493 - 495
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Nov 26, 2009
Accepted: Aug 13, 2010
Published online: Mar 15, 2011
Published in print: Apr 1, 2011
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