Experimental investigation of local scour around circular bridge piers under steady state flow conditions

Experimental investigation of local scour around circular bridge piers under steady state flow conditions

Local scour around bridge piers is one of the main causes of bridge failures. In this study, scour depths and scour hole geometries around circular bridge piers were investigated under clear water scour conditions for various flow rates. The experiments were carried out in a rectangular flume 80 cm...

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Bibliographic Details
Published in:Journal of the South African Institution of Civil Engineers Vol. 58; no. 3; pp. 21 - 27
Main Authors: Aksoy, A.O., Eski, O.Y.
Format: Journal Article
Language:English
Published: South African Institution Of Civil Engineering (SAICE) 01-09-2016
Subjects:
Bridge pier
Bridge piers
Circularity
Clear-water scour
Empirical equations
Flow rate
Flowmeters
Mathematical analysis
Scour hole geometry
Scouring
Steady flow
Steady state
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Summary:Local scour around bridge piers is one of the main causes of bridge failures. In this study, scour depths and scour hole geometries around circular bridge piers were investigated under clear water scour conditions for various flow rates. The experiments were carried out in a rectangular flume 80 cm wide, 18.6 m long and 75 cm high by using uniform sediment with a median diameter of 1.63 mm and geometric standard deviation of 1.3. The flow rates and approach flow depths were measured with an electromagnetic flow meter and ultrasonic level sensors, respectively. A new empirical equation for the determination of scour depth is proposed based on the experimental findings of the present study and on experimental data available in the literature. The experimental results were also compared with those calculated using several empirical equations developed by previous studies. The proposed new equation to predict scour depth around a circular bridge pier was evaluated in terms of determination co-efficient (R2) and scatter index (SI). The Fisher (f) test was also applied to test the statistical significance of the proposed equation.
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ISSN:1021-2019
2309-8775
DOI:10.17159/2309-8775/2016/v58n3a3