Protecting bridge piers against local scour using a flow-diversion structure

Ranjbar-Zahedani, M; Keshavarzi, A; Khabbaz, H; Ball, J

Protecting bridge piers against local scour using a flow-diversion structure

Ranjbar-Zahedani, M Keshavarzi, A Khabbaz, H

Ball, J

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Publication Type:: Journal Article
Citation:: Proceedings of the Institution of Civil Engineers: Water Management, 2018, 171 (5), pp. 271 - 280
Issue Date:: 2018-10-01

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Field	Value	Language
dc.contributor.author	Ranjbar-Zahedani, M	en_US
dc.contributor.author	Keshavarzi, A	en_US
dc.contributor.author	Khabbaz, H https://orcid.org/0000-0001-6637-4601	en_US
dc.contributor.author	Ball, J https://orcid.org/0000-0001-8342-1916	en_US
dc.date.issued	2018-10-01	en_US
dc.identifier.citation	Proceedings of the Institution of Civil Engineers: Water Management, 2018, 171 (5), pp. 271 - 280	en_US
dc.identifier.issn	1741-7589	en_US
dc.identifier.uri	http://hdl.handle.net/10453/127202
dc.description.abstract	© 2018 ICE Publishing. All rights reserved. Previous studies indicate that local scour is a leading cause of most waterway bridge failures during flood events. Using armouring countermeasures such as riprap and gabions is a conventional way of reducing scour around bridge piers, but is very costly and time consuming. As an alternative, a flow-diversion structure is proposed that has a triangular prismatic shape with dimensions much smaller than the actual pier and should be installed upstream of the pier. To assess its performance, experiments were conducted under clear-water scour conditions. After achieving equilibrium bed conditions, the bed profile was measured and the maximum scour depth and volume of the scour hole were determined for each experimental test. The results indicated that the clear distance between the pier and the countermeasure to achieve the maximum reduction in local scour was 1·5 times the pier diameter. For this condition, the proposed countermeasure reduced the maximum scour depth by 38% and the volume of the scour hole was decreased by around 61%. To determine the influence of the countermeasure on flow field around the pier, three-dimensional velocity components were measured at grid points using a micro-acoustic Doppler velocity meter. Analysis of the results indicated that the proposed structure could change both the magnitude and direction of the velocity components upstream of the pier and consequently induce a significant reduction in local scour depth and volume around the pier.	en_US
dc.relation.ispartof	Proceedings of the Institution of Civil Engineers: Water Management	en_US
dc.relation.isbasedon	10.1680/jwama.18.00002	en_US
dc.title	Protecting bridge piers against local scour using a flow-diversion structure	en_US
dc.type	Journal Article
utslib.citation.volume	5	en_US
utslib.citation.volume	171	en_US
utslib.for	0905 Civil Engineering	en_US
utslib.for	0907 Environmental Engineering	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CBI - Centre for Built Infrastructure
pubs.organisational-group	/University of Technology Sydney/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment
pubs.organisational-group	/University of Technology Sydney/Students
utslib.copyright.status	closed_access
pubs.issue	5	en_US
pubs.publication-status	Published	en_US
pubs.volume	171	en_US

Abstract:

© 2018 ICE Publishing. All rights reserved. Previous studies indicate that local scour is a leading cause of most waterway bridge failures during flood events. Using armouring countermeasures such as riprap and gabions is a conventional way of reducing scour around bridge piers, but is very costly and time consuming. As an alternative, a flow-diversion structure is proposed that has a triangular prismatic shape with dimensions much smaller than the actual pier and should be installed upstream of the pier. To assess its performance, experiments were conducted under clear-water scour conditions. After achieving equilibrium bed conditions, the bed profile was measured and the maximum scour depth and volume of the scour hole were determined for each experimental test. The results indicated that the clear distance between the pier and the countermeasure to achieve the maximum reduction in local scour was 1·5 times the pier diameter. For this condition, the proposed countermeasure reduced the maximum scour depth by 38% and the volume of the scour hole was decreased by around 61%. To determine the influence of the countermeasure on flow field around the pier, three-dimensional velocity components were measured at grid points using a micro-acoustic Doppler velocity meter. Analysis of the results indicated that the proposed structure could change both the magnitude and direction of the velocity components upstream of the pier and consequently induce a significant reduction in local scour depth and volume around the pier.

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http://hdl.handle.net/10453/127202