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Experimental study of debris-induced scour around a slotted bridge pier

Hamidifar, H, Mohammad Ali Nezhadian, D and Carnacina, I (2022) Experimental study of debris-induced scour around a slotted bridge pier. Acta Geophysica. ISSN 1895-6572

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Abstract

One of the most common problems for river engineers is the accumulation of waterborne debris upstream of the bridge piers. In addition to reducing the cross-sectional flow area, debris increases the drag force exerted to the pier and contributes to scour. Several studies have been carried out by previous researchers to examine the usefulness of different types of countermeasures. The effectiveness of these countermeasures is not well understood when debris accumulation occurs. In this study, the effect of debris accumulation on the efficiency of a bridge pier slot, as scour countermeasure, is investigated experimentally. A total of 54 experiments were carried out under different hydraulic and debris geometrical conditions. The results showed that slots were effective in protecting bridge piers against scouring in presence of debris. Depending on the debris shape, the reduction efficiency may increase or decrease for a slotted pier in presence of debris accumulation when compared to the standard pier conditions without debris accumulation. Except for the inverse pyramid shape, the maximum scour is generally more reduced due to sheltering effect when the debris is located on the bed. While debris accumulation can lead to a reduction of the slot efficiency, the slot can be considered a reliable countermeasure against scouring. The outcome of this study can help the design of new bridges affected by large wood debris accumulations

Item Type: Article
Additional Information: The version of record of this article, first published in Acta Geophysica, is available online at Publisher’s website: http://dx.doi.org/10.1007/s11600-021-00722-2
Uncontrolled Keywords: 0404 Geophysics
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TG Bridge engineering
Divisions: Civil Engineering & Built Environment
Publisher: Springer Science and Business Media LLC
Date Deposited: 29 Mar 2022 13:50
Last Modified: 29 Mar 2022 14:00
DOI or Identification number: 10.1007/s11600-021-00722-2
URI: https://researchonline.ljmu.ac.uk/id/eprint/16163

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