Equivalent Roughness Height for Plane Bed under Steady Flow
Publication: Journal of Hydraulic Engineering
Volume 132, Issue 11
Abstract
This paper presents a new relationship between the roughness height and the main hydrodynamic and sediment parameters for plane beds under steady current conditions. In order to derive such a formula, a large data base involving plane-bed experiments was compiled from previous investigations and analyzed. Comparisons between the data and different existing predictive formulas for the bed roughness obtained from the literature were also made. A relationship with the Shields parameter only, which is commonly proposed, appeared to be insufficient. The roughness was also found to be a function of a Froude number and a dimensionless settling velocity. A critical Shields parameter was identified up to which the equivalent roughness ratio is proportional to the Shields parameter. The new empirical equation that was developed yields the best results for all conditions investigated, and should improve the understanding of the total shear stress.
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Acknowledgments
This work was conducted in part under the Inlet Modeling System Work Unit of the Coastal Inlets Research Program, U.S. Army Corps of Engineers and in part under the HUMOR program supported by the European Community.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 132 • Issue 11 • November 2006
Pages: 1146 - 1158
Copyright
© 2006 ASCE.
History
Received: Jul 25, 2003
Accepted: Jan 30, 2006
Published online: Nov 1, 2006
Published in print: Nov 2006
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