Experimental and numerical investigation of scour around inclined pier group with sacrificial pile and collar

Document Type : Research Article

Authors

1 Tabriz University

2 Water Engineering Department, Faculty of Agriculture, University of Tabriz, Tabriz, Iran

Abstract

The scour has been studied in hydraulic science for many years; due to its complexity, it has been the attention of hydraulic scientists. Hydraulic structures are situated as an obstacle in front of water flow that changed the flow pattern in their vicinity and causing the local scour around the structure. There are various methods to reduce local scour around the pier. In this research, sacrificial pile and collar were used to reduce the local scour around the inclined pier group. The results show that using the sacrificial pile in front of the inclined pier group, the effect of the inclined pier angle on the reduction of the scour is lower. So the difference between the percentage of scour reduction for the first and second inclined piers with the angle of 5 and 15 degrees is zero and in vertical pier is 1.4%. The use of three collars with a diameter of 4b in pier group with the distance of 4b between piers and presence of sacrificial pile in front of the first inclined pier in the distance of 3b compared to 2b show a greater scour depth reduction in front of the piers. In the numerical model, the use of an inclined pier group with the distance of 3b between piers and sacrificial pile with the distance of 2b shows lower turbulence intensity compared to distances of b and 3b.

Keywords

Main Subjects

References

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Amirkabir Journal of Civil Engineering
Volume 53, Issue 9
December 2021
Pages 3607-3622

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