Influence of Cohesion on River Bed Scour in the Wake Region of Piers
Publication: Journal of Hydraulic Engineering
Volume 140, Issue 1
Abstract
Studies on scour in the wake region of piers in cohesive sediments containing gravel were not reported in literature, to the best of our knowledge. Results from the laboratory experiments based study on the process of wake scour are presented here. The sediment used for the experiment were of two types: (1) fine gravel mixed with clay in proportions varying from 20% to 60% by weight, and (2) fine gravel and fine sand in equal proportion by weight mixed with clay in proportions varying from 20% to 60% by weight. The experiments revealed that the process of scour as well as depth, shape, and geometry of scour hole developed in such cohesive sediment were significantly different from that of cohesionless sediments. Proportion of clay fraction and unconfined compressive strength of cohesive sediment mixture were found to be the most significant variables controlling the depth of scour in the wake of piers. On the basis of dimensional considerations, relationships have been proposed for the estimation of the depth of scour in the wake region of piers in clay-gravel and clay-sand-gravel sediment mixtures.
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Acknowledgments
The authors are in great pain and grief on the early demise of Dr. U. C. Kothyari, Ex Professor Department of Civil Engineering, Indian Institute of Technology Roorkee on December 29, 2012. The authors feel privileged greatly to express their deep sense of gratitude to late Dr. U. C. Kothyari for giving the authors an opportunity to do this work under his sincere, intelligent, and honest guidance at Indian Institute of Technology, Roorkee. This work could have been completed only because of his invaluable guidance, fruitful suggestions, generous help, and motivation throughout the present investigation. He had been our key source of inspiration throughout this novel research work.
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Published In
Journal of Hydraulic Engineering
Volume 140 • Issue 1 • January 2014
Pages: 1 - 13
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Aug 29, 2012
Accepted: Jun 13, 2013
Published online: Dec 16, 2013
Published in print: Jan 1, 2014
Discussion open until: May 16, 2014
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