Temporal Scales for Live-Bed Scour at Abutments
Publication: Journal of Hydraulic Engineering
Volume 136, Issue 7
Abstract
Live-bed scour at a vertical-wall abutment is experimentally investigated with specific attention paid to the conceptual issues concerning the temporal development of local scour phenomenon. First explored are the time scales for the initial rising phase of the time variation of scour depth. An appropriate identification of such scales and of their normalizing parameters makes it possible to recognize a quantitative dependency of nondimensional time scales on flow intensity. Second, the time scales for the subsequent fluctuations around a mean equilibrium value are considered. Experimental results indicate that the quasiperiodical fluctuations of scour depths do not always correspond to those of bed forms. A conceptual model is outlined to explain this aspect.
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Information
Published In
Journal of Hydraulic Engineering
Volume 136 • Issue 7 • July 2010
Pages: 395 - 402
Copyright
© 2010 ASCE.
History
Received: Oct 31, 2008
Accepted: Nov 26, 2009
Published online: Dec 4, 2009
Published in print: Jul 2010
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