Maximum Local Scour Depth at Bridge Piers under Unsteady Flow
Publication: Journal of Hydraulic Engineering
Volume 135, Issue 7
Abstract
The temporal effect of hydrograph on local scour depth is investigated under clear-water scour condition. By analyzing the characteristics of scour-depth evolutions at bridge piers for different rising hydrographs, a relation for estimating the maximum scour depth in uniform sediment is proposed. In the relation, the flow unsteadiness effect is taken into account by an unsteady flow parameter combining the peak-flow intensity and time-to-peak factors. For nonuniform sediment with employed as the effective sediment size, this relation can yield reasonably good results of the maximum scour depth under rising hydrograph.
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Acknowledgments
The facilities provided for this study by the Hydrotech Research Institute, National Taiwan University, Taipei, Taiwan, are gratefully acknowledged. Part of the financial support from the National Science Council, Taiwan, under Grant No. NSCTNSC 94-2211-E-002-045 is hereby highly appreciated.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 135 • Issue 7 • July 2009
Pages: 609 - 614
Copyright
© 2009 ASCE.
History
Received: Dec 16, 2007
Accepted: Dec 28, 2008
Published online: Feb 6, 2009
Published in print: Jul 2009
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