Estimation of maximum scour depths at upstream of front and rear piers for two in-line circular columns

Keshavarzi, A; Shrestha, CK; Melville, B; Khabbaz, H; Ranjbar-Zahedani, M; Ball, J

Estimation of maximum scour depths at upstream of front and rear piers for two in-line circular columns

Keshavarzi, A Shrestha, CK Melville, B Khabbaz, H

Ranjbar-Zahedani, M Ball, J

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Publication Type:: Journal Article
Citation:: Environmental Fluid Mechanics, 2018, 18 (2), pp. 537 - 550
Issue Date:: 2018-04-01

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Field	Value	Language
dc.contributor.author	Keshavarzi, A	en_US
dc.contributor.author	Shrestha, CK	en_US
dc.contributor.author	Melville, B	en_US
dc.contributor.author	Khabbaz, H https://orcid.org/0000-0001-6637-4601	en_US
dc.contributor.author	Ranjbar-Zahedani, M	en_US
dc.contributor.author	Ball, J https://orcid.org/0000-0001-8342-1916	en_US
dc.date.issued	2018-04-01	en_US
dc.identifier.citation	Environmental Fluid Mechanics, 2018, 18 (2), pp. 537 - 550	en_US
dc.identifier.issn	1567-7419	en_US
dc.identifier.uri	http://hdl.handle.net/10453/122147
dc.description.abstract	© 2018, Springer Science+Business Media B.V., part of Springer Nature. Previous investigations indicate that scour around bridge piers is one of the most important factors for the failure of waterway bridges. Hence, it is essential to determine the accurate scour depth around the bridge piers. Most of the previous studies were based on scour around a single pier; however, in practice, new bridges are usually wide and then piers comprise two circular piers aligned in the flow direction that together support the loading of the structure. In this study, the effect on maximum scour depth of the spacing between two piers aligned in the flow direction was investigated experimentally under clear water scour conditions. The results show that the maximum scour depth at upstream of the front pier occurs when the spacing between the two piers is 2.5 times the diameter of the pier. Two semi empirical equations have been developed to predict the maximum scour depth at upstream of both front and rear piers as a function of the spacing between the piers, in terms of a pier-spacing factor. If the new equations for the pier-spacing factor are used with some of the existing equations for scour at a single pier, the predicted scouring depths are in good agreement with observed results. The S/M equation exhibited the best performance among the various equations tested and was recommended for use in prediction of the equilibrium scour depth. The findings of this study can be used to facilitate the positioning of piers when scouring is a design concern.	en_US
dc.relation.ispartof	Environmental Fluid Mechanics	en_US
dc.relation.isbasedon	10.1007/s10652-017-9572-6	en_US
dc.subject.classification	Meteorology & Atmospheric Sciences	en_US
dc.title	Estimation of maximum scour depths at upstream of front and rear piers for two in-line circular columns	en_US
dc.type	Journal Article
utslib.citation.volume	2	en_US
utslib.citation.volume	18	en_US
utslib.for	0905 Civil Engineering	en_US
utslib.for	01 Mathematical Sciences	en_US
utslib.for	02 Physical Sciences	en_US
utslib.for	09 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	2	en_US
pubs.publication-status	Published	en_US
pubs.volume	18	en_US

Abstract:

© 2018, Springer Science+Business Media B.V., part of Springer Nature. Previous investigations indicate that scour around bridge piers is one of the most important factors for the failure of waterway bridges. Hence, it is essential to determine the accurate scour depth around the bridge piers. Most of the previous studies were based on scour around a single pier; however, in practice, new bridges are usually wide and then piers comprise two circular piers aligned in the flow direction that together support the loading of the structure. In this study, the effect on maximum scour depth of the spacing between two piers aligned in the flow direction was investigated experimentally under clear water scour conditions. The results show that the maximum scour depth at upstream of the front pier occurs when the spacing between the two piers is 2.5 times the diameter of the pier. Two semi empirical equations have been developed to predict the maximum scour depth at upstream of both front and rear piers as a function of the spacing between the piers, in terms of a pier-spacing factor. If the new equations for the pier-spacing factor are used with some of the existing equations for scour at a single pier, the predicted scouring depths are in good agreement with observed results. The S/M equation exhibited the best performance among the various equations tested and was recommended for use in prediction of the equilibrium scour depth. The findings of this study can be used to facilitate the positioning of piers when scouring is a design concern.

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http://hdl.handle.net/10453/122147