|Water Science and Engineering 2018, 11(1) 53-60 DOI: https://doi.org/10.1016/j.wse.2018.03.001 ISSN: 1674-2370 CN: 32-1785/TV|
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Effect of trapezoidal collars as a scour countermeasure around wing-wall abutments
Payam Khosravinia a, Amir Malekpour b,*, Ali Hosseinzadehdalir c, Davod Farsadizadeh c
a College of Agriculture, University of Kurdistan, Sanandaj 66177, Iran b College of Agricultural Sciences, University of Guilan, Rasht 41996, Iran c College of Agriculture, University of Tabriz, Tabriz 51666, Iran
Local scour around bridge abutments is a widespread problem that can result in structural failure. Collars can be used as a countermeasure to reduce the scour depth. In this study, the temporal scour development around a wing-wall abutment was investigated with and without collars. The tests were carried out under clear-water conditions for different abutment lengths, with collars of different sizes placed at the bed level. When no collar was used in the experiments, 70% of the maximum scour depth occurred in less than 2 h. However, when a collar with a width greater than the length of the abutment was used, no scour was observed for up to 200 min from the beginning of the experiments. The results show that an increase in the collar width not only led to a lag time for the onset of scouring but also reduced the maximum scour depth. Moreover, an increased collar width led to a better performance in mitigating scouring around smaller abutments. Generally, the scour depth decreased by 9%e37% with different collar widths.
|Keywords： Scour development Equilibrium scour depth Trapezoidal collar Wing-wall abutment Clear-water condition|
|Received 2016-11-14 Revised 2017-09-11 Online: 2018-01-31|
|Corresponding Authors: email@example.com (Amir Malekpour)|
|About author: firstname.lastname@example.org (Amir Malekpour)|
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