Effects of Lifting Force on Bed Topography and Bed-Surface Sediment Size in Channel Bend
Publication: Journal of Hydraulic Engineering
Volume 137, Issue 9
Abstract
In bed-load sediment transport, the lifting force plays an important role in reducing the friction between sediment particles and the bed surface, and it makes particle transportation by the shear force easier. Because the lifting force is related to vorticity, a three-dimensional (3D) numerical model incorporating large eddy simulations was applied to simulate the vorticity field in a channel bend. The results show that the distribution of vorticity is highly nonuniform, and it can lead to significant variations in lifting force and bed-load sediment transport per unit width in a channel bend. Relevant theories are modified on the basis of physical reasoning and then incorporated into numerical models to investigate the lifting-force effects on the bed topography and bed-surface sediment size gradation in a channel bend. With the lifting-force effects considered, it is shown that the errors in simulated bed topography can be reduced by approximately 40% and in bed-surface sediment size by 50%.
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Acknowledgments
The computer resources and laboratory facilities provided for this research by National Center for High-Performance Computing and Hydrotech Research Institute of National Taiwan University are gratefully acknowledged. The authors would like to express their sincere gratitude to Professors D. L. Young, A. Y. Kuo, and K. C. Yeh for their valuable comments.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 137 • Issue 9 • September 2011
Pages: 911 - 920
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Jan 5, 2009
Accepted: Feb 4, 2011
Published online: Feb 8, 2011
Published in print: Sep 1, 2011
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