Mean Flow and Turbulence around a Laboratory Spur Dike
Publication: Journal of Hydraulic Engineering
Volume 135, Issue 10
Abstract
The three-dimensional turbulent flow field around a spur dike in a plane fixed-bed laboratory open channel was studied experimentally using a microacoustic Doppler velocimeter. Mean and turbulence characteristics in all three spatial directions were evaluated at upstream and downstream cross sections near the dike. Results showed that the primary flow separated in both lateral and vertical directions. Two counter-rotating flow circulations, consisting of the lateral and vertical velocity components, originated at the dike section. Downstream of the dike, the circulation in the flow-separation zone is stronger than the one in the contracted primary flow zone. The maximum bed-shear stresses estimated using Reynolds stresses is about three times as large as the mean bed-shear stress of incoming flow.
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Acknowledgments
The writer is grateful to the constructive comments provided by the reviewers and the editor. Research funding was provided by the Visitor Program of the National Center of Earth Surface Dynamics (NCED) (NSF Award No. UNSPECIFIEDEAR-0120914) and the Army Research Office (Proposal No. USARO52326EV and NSF Award No. USAROEAR-0532691) to the University of Arizona.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 135 • Issue 10 • October 2009
Pages: 803 - 811
Copyright
© 2009 ASCE.
History
Received: Jul 28, 2006
Accepted: Feb 20, 2009
Published online: Feb 23, 2009
Published in print: Oct 2009
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