Bridge Pier Scour in Clay-Sand Mixed Sediments at Near-Threshold Velocity for Sand
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Volume 136, Issue 9
Abstract
Local scour at circular bridge piers embedded in a clay-sand-mixed bed was investigated in laboratory flume experiments. The effects of clay content, water content, and sand size on maximum equilibrium scour depth, equilibrium scour hole geometry, scouring process, and time variation of scour were studied at velocities close to the threshold velocities for the sand in the clay-sand mixture. It was observed that clay content and water content were the key parameters that effect the scouring process, scour hole geometry, and maximum equilibrium scour depth. The bridge pier scouring process in clay-sand mixtures involved different dominating modes for removal of sediment from scour hole: chunks-of-aggregates, aggregate-by-aggregate, and particle-by-particle. Regression-based equations for estimation of nondimensional maximum scour depth and scour hole diameter for piers embedded in clay-sand mixtures having clay content of and water content of were proposed as functions of pier Froude number, clay content, water content, and bed shear strength.
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Acknowledgments
The research has been completely funded by Department of Science and Technology (Contract No. UNSPECIFIEDSR/S3/MERC/36/2006 dated 11.12.2006), Government of India. The kind cooperation extended by scientists S. S. Kohli and Satish S. Sonwane, Department of Science and Technology, Government of India is gratefully acknowledged. M. Chattopadhyay, Bengal Engineering and Science University, India provided useful suggestions. The writers are grateful to Professor Vladimir Nikora, University of Aberdeen, Scotland for useful discussions regarding cohesive sediment transport processes. The writers are also grateful to the editor, the associate editor, and five anonymous reviewers for providing their valuable suggestions.
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Information
Published In
Journal of Hydraulic Engineering
Volume 136 • Issue 9 • September 2010
Pages: 597 - 609
Copyright
© 2010 ASCE.
History
Received: Aug 28, 2008
Accepted: Mar 10, 2010
Published online: Mar 12, 2010
Published in print: Sep 2010
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