Reduction of local scour around bridge piers: combined system of aerofoil and slot

Christensen, Zane Michael (2009) Reduction of local scour around bridge piers: combined system of aerofoil and slot. [USQ Project] (Unpublished)

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Abstract

Local scouring is one of the main causes of bridge damage or collapse in river crossings. Bridge failure can cause severe damage and can result in serious injury or death. Hence, study on the control of scouring at bridge piers plays an important role in bridge design. The aim of this study was to evaluate the effectiveness of a slotted aerofoil shaped pier in reducing local scour, as compared to a circular shaped and aerofoil shaped pier. The piers were tested under clear-water conditions for a uration of 3 hours and the resulting scour holes were scanned using a ScanStation 2. Further to this, velocity measurements were recorded at key points around the piers using an acoustic Doppler velocimeter. The results showed that the slotted aerofoil shaped pier reduces local scour. The reduction of the scour hole volume was about 85% when compared to the circular pier. Measured velocities assisted in the understanding of the resultant scour holes for the three piers and showed that for the case of the slotted aerofoil pier, the wake vortex shedding had been significantly reduced, as had the intensity of the downflow and horseshoe vortex at the nose of the pier. These results showed that the combination of a slot and aerofoil shape may be a very effective countermeasure against local scouring at bridge piers


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Item Type: USQ Project
Refereed: No
Item Status: Live Archive
Depositing User: epEditor USQ
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Agricultural, Civil and Environmental Engineering
Date Deposited: 15 Jul 2010 06:19
Last Modified: 06 Jun 2014 05:51
Uncontrolled Keywords: bridge piers; reduction of scouring; slotted aerofoil
Fields of Research (FOR2008): 09 Engineering > 0907 Environmental Engineering > 090702 Environmental Engineering Modelling
09 Engineering > 0915 Interdisciplinary Engineering > 091504 Fluidisation and Fluid Mechanics
URI: http://eprints.usq.edu.au/id/eprint/8387

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