Measured and Simulated Flow near a Submerged Spur Dike
Publication: Journal of Hydraulic Engineering
Volume 134, Issue 7
Abstract
To improve knowledge of the flow and scour processes associated with spur dikes, three-dimensional flow velocities were measured at 2,592 points using an acoustic Doppler velocimeter over a fixed flat bed with a trapezoidal shaped submerged spur dike in a laboratory flume. General velocity distribution and detailed near field flow structures were revealed by the measurements and numerical simulations performed using a free surface turbulent flow model with a closure scheme. The three-dimensional flow separation characterized in this study was found to yield forces on the bed that were significantly different from nonsubmerged vertical obstructions that have been measured in other studies. Values of bed shear stress derived from both measured and simulated values were similar but indicated that local scour would be initiated in one rather than in the two locations of initial local scour measured in previous experiments with a similar flow.
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Acknowledgments
This work is a result of research supported in part by the USDA Agriculture Research Service under the Specific Research Agreement No. 58-6408-7-035 monitored by the USDA-ARS National Sedimentation Laboratory (NSL) and The University of Mississippi (UM). John Cox (NSL) and Emery Sayre (UM) carried out the flume measurements, and John Cox performed the initial processing of the velocity data. T.T. Zhu (UM) helped to produce many of the figures.
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Information
Published In
Journal of Hydraulic Engineering
Volume 134 • Issue 7 • July 2008
Pages: 916 - 924
Copyright
© 2008 ASCE.
History
Received: Mar 26, 2004
Accepted: Sep 13, 2007
Published online: Jul 1, 2008
Published in print: Jul 2008
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