Experimental investigation and flow analysis of clear-water scour around pier and abutment in proximity

Fakhimjoo, Mohammad Saeed, Ardeshir, Abdollah, Behzadian, Kourosh ORCID: https://orcid.org/0000-0002-1459-8408 and Karami, Hojat (2022) Experimental investigation and flow analysis of clear-water scour around pier and abutment in proximity. Water Science and Engineering. ISSN 1674-2370 (In Press)

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Abstract

Local scour around bridge piers and abutments is one of the most important causes of bridge failure. Despite a plethora of studies on scour around individual bridge piers or abutments, few studies focused on the joint impact of a pier and an abutment in proximity on scour. This study conducted laboratory experiments and flow analyses to examine the interaction of piers and abutments on clear-water scour. The experiments were conducted in a rectangular laboratory flume, including 18 main tests (combination of different types of piers and abutments) and five control tests (individual piers or abutments). Three types of piers (a rectangular pier with a rounded edge, a group of three cylindrical piers, a single cylindrical pier) and two types of abutment (a wing-wall abutment and a semi-circular abutment) were used. Acoustic Doppler Velocimeter (ADV) was used to measure the three-dimensional flow velocity for analyses of streamline, velocity magnitude, vertical velocity, and bed shear stress. The results showed the velocity near the pier and abutment increased by up to 80%. The maximum scour depth around the abutment increased by up to 19%. In contrast, the maximum scour depth around the pier increased significantly by up to l71%. The presence of the pier in the vicinity of the abutment led to an increase in the scour hole volume by up to 87% relative to the case with an individual abutment. The empirical equations were also derived to accurately estimate the maximum scour depth at the pier adjacent to the abutment.

Item Type: Article
Keywords: Abutment; ADV; Bridge scour; Laboratory experiment; Maximum scour depth; Pier
Subjects: Construction and engineering > Civil and environmental engineering
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Depositing User: Kourosh Behzadian Moghadam
Date Deposited: 28 Sep 2022 20:55
Last Modified: 20 Oct 2022 15:16
URI: https://repository.uwl.ac.uk/id/eprint/9416

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