Evaluation of Flow-Altering Countermeasures against Bridge Pier Scour
Publication: Journal of Hydraulic Engineering
Volume 138, Issue 3
Abstract
In this study, six different types of flow-altering countermeasures against pier scour were evaluated experimentally. The selected countermeasures were submerged vanes, bed sill, transverse sacrificial piles, collar, threading, and pier slot. Laboratory tests were performed in clear-water conditions with flow intensity slightly below the threshold of sediment motion. Tests were designed on the basis of the best configurations recommended in previous studies by different authors to obtain the maximum efficiency in terms of scour depth reduction. Results showed that some countermeasures, which were recommended as highly efficient in the literature, do not perform well under other test conditions; in particular, literature tests carried out with low flow intensity or short duration or in narrow-channel conditions are criticized. The efficiency of bed sill, submerged vanes, and threading was found to be less than 20%, whereas collar, pier slot, and transverse sacrificial piles reduced the maximum scour depth of approximately 35% or less. Finally, design of a pier slot is discussed, and an optimum configuration is proposed.
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Acknowledgments
Funding was provided by the Italian Ministero dell’Istruzione, dell’Università e della Ricerca (MIUR), PRIN 2007 Modelli e misure di interazione corrente-sedimenti a diverse scale spaziali e temporali di interesse fisico (MOMICS).
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Information
Published In
Journal of Hydraulic Engineering
Volume 138 • Issue 3 • March 2012
Pages: 297 - 305
Copyright
© 2012 American Society of Civil Engineers.
History
Received: Jun 14, 2011
Accepted: Sep 22, 2011
Published online: Feb 15, 2012
Published in print: Mar 1, 2012
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