Flow Details near River Groynes: Experimental Investigation
Publication: Journal of Hydraulic Engineering
Volume 137, Issue 5
Abstract
Experiments have been carried out in a fixed-bed flume for a schematized straight river reach with groynes on one side to study the dynamics of the flow near groynes. The flume had a geometrical scale of , based on typical dimensions of the Dutch River Waal. Both emergent and submerged groynes were studied. The measurements demonstrate the differences in the nature of the turbulence between submerged and emerged groynes stages; and provide insight into the flow pattern in the vicinity of groynes, the shape and the extent of the mixing layer at different flow stages, and the dynamic behavior of the velocity along the mixing layer between the main channel and the groyne fields. A parameterization of the turbulence characteristics of the flow near groynes is presented. Large-scale velocity fluctuations are found in all test cases, with timescales that vary with the flow stage. The large-scale and velocity fluctuations are in phase in the center of the mixing layer and out of phase for the points on the boundaries of the mixing layer.
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Acknowledgments
This study was carried out within the framework of DIOC-Water, theme 1.3 (intermediate-scale morphological developments in rivers due to human interventions) and Delft Cluster, theme 3 (coasts and rivers). The authors would like to thank the staff members of the Laboratory for Fluid Mechanics at Delft University of Technology for facilitating the experiment in all its stages. The authors also thank: Mr. G. J. Klaassen, and Drs. E. Mosselman, C. J. Sloff, and W. S. J. Uijttewaal for their constructive comments and discussions during the different stages of the study. The experiment was partly financed by the Road and Hydraulic Engineering Division (DWW) of the Ministry of Transport, Public Works and Water Management. Finally, the authors thank M. van der Wal for his support, and M. H. Berg for conducting the experiments.
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Information
Published In
Journal of Hydraulic Engineering
Volume 137 • Issue 5 • May 2011
Pages: 504 - 516
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Jun 21, 2006
Accepted: Sep 2, 2010
Published online: Sep 7, 2010
Published in print: May 1, 2011
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