Time Scale for Local Scour at Bridge Piers
Publication: Journal of Hydraulic Engineering
Volume 125, Issue 1
Abstract
The temporal development of clear-water local scour depth at cylindrical bridge piers in uniform sand beds is considered. New data are presented and used to quantify the influence of flow duration on the depth of local scour. An equilibrium time scale (t*) is defined. The data show that both t* and the equilibrium scour depth (dse) are subject to similar influences of flow and sediment parameters, as might be expected because they are inherently interdependent. A method is given for determination of the time for development of dse for a given pier, sediment, and approach flow velocity and the concomitant estimation of the scour depth at any stage during development of the equilibrium scour hole. The results show that the scour depth after 10% of the time to equilibrium is between about 50% and 80% of the equilibrium scour depth, depending on the approach flow velocity.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 125 • Issue 1 • January 1999
Pages: 59 - 65
History
Received: Jul 22, 1997
Published online: Jan 1, 1999
Published in print: Jan 1999
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