Experimental Investigation of the Debris Configurations Effects on the Scour Hole Morphology at Circular Bridge Piers

The hydraulic conditions and river bed morphology at bridge piers get extremely changed with debris accumulations. In this study, a series of tests were conducted to understand the scour hole geometry behaviour during debris accumulation at circular bridge pier. Three groups of rectangular debris we...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2020-02, Vol.737 (1), p.12157
Main Authors: Al-Khafaji, Mahmoud Saleh, Al-Awadi, Aysar Tuama
Format: Article
Language:English
Subjects:
Accumulation
Area
Bridge piers
Debris
Morphology
Piers
River beds
Scouring
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Summary:The hydraulic conditions and river bed morphology at bridge piers get extremely changed with debris accumulations. In this study, a series of tests were conducted to understand the scour hole geometry behaviour during debris accumulation at circular bridge pier. Three groups of rectangular debris were tested under clear water condition with 27 tests. The most dangerous shapes from these groups were specified and the effects of debris thickness, width and length were elaborated. The results show that the scour depth, width and length increased as the percentage of obstructed area of debris to the flow area increased. Hence, the modification factor of scour hole dimensions increased. The study concluded that the modification debris coefficient for scour hole depth, width and length increased to 2.397, 2.308 and 2.145 when the obstructed area of debris to the flow area increases from 2.07% to 26.89%, respectively. More notifications should be considered in protection work around bridge piers subjected to debris accumulation.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/737/1/012157