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Time-dependent local scour around bridge piers under ice cover-an experimental study

1，2 1 1 2
WANG Jun ，LI Zhiqi ，CHENG Tiejie ，SUI Jueyi
（1. School of Civil Engineering，Hefei University of Technology，Hefei 230009，China；
2. Environmental Engineering，University of Northern British Columbia，Prince George，BC，Canada）

Abstract：In cold regions，the presence of ice cover in a river changes the flow velocity distribution. The
maximum flow velocity under an ice-covered flow condition is shifted closer to the channel bed，which can
intensify the local scour process around bridge piers comparing to that under an open flow condition. Exces⁃
sive scour around bridge piers may cause a collapse of bridges. In the present study，a series of clear-wa⁃
ter experiments were carried out in flume to investigate the time-dependent local scour around a cylindrical
pier under both ice-covered and open flow conditions. The results show that the local scour rate under
ice-covered condition is faster than that under open flow condition. The equilibrium scour depth under
ice-covered flow condition is 12% more than that under open flow condition. Also， the time needed for
achieving an equilibrium state under ice-covered flow condition is 10% more than that under open flow con⁃
dition. The relationship between the flow intensity and the dimensionless scour depth has been assessed，
and the difference between scouring rates of two different cover conditions was studied. An empirical equa⁃
tion for calculating time-dependent local scour depth under ice-covered flow condition was developed. The
results of this study can be used as reference for engineering practice.
Keywords：ice cover；local scour；time-dependent；scour depth；experimental study

（责任编辑：李福田）

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