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Effect of vegetated-banks on local scour around a wing-wall abutment with circular edges

Journal of Hydrodynamics 2014年第3期26卷 447-457页

作者： AFZALIMEHR Hossein BAKHSHI Somayeh GALLICHAND Jacques SUI Jueyi Department of Water Engineering Isfahan University of Technology Isfahan Iran Department Des Sols Et De Génie Agroalimentaire Pavillon Paul-Comtois Université Laval St-Foy QC Canada Environmental Engineering program University of Northern British Colombia Prince George BC Canada

Failure of bridges due to local scour in the vicinity of bridge abutments is a common occurrence. In this study, experiments under two different channel conditions were conducted to assess the impacts of vegetation on channel banks on local scour around a wing-wall abutment with circular edges. Some experiments were conducted in channel with vegetation on channel banks, and other experiments in channel without vegetation on channel bank. The flow velocity and Reynolds stress distributions in scour holes around a wing-wall abutment with circular edges were compared under these 2 different channel conditions. Results reveal that the vegetated-banks can reduce the time for achieving the equilibrium condition from 17 h to 9 h. Also, vegetated-bank channels can result in a significant decrease in the maximum scour depth from 0.084 m（for bare channel bank） to 0.00032 m. Additionally, around the abutment, vegetated-banks play a significant role in diminishing the Reynolds stress（RS） near the bed and removing negative values in RS distribution by weakening unfavorable pressure gradient and down-flow in the upstream of abutment.

关键词： local scour vegetated-banks wing-wall abutment circular edges Reynolds stress(RS)

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Effect of trapezoidal collars as a scour countermeasure around wing-wall abutments

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Water Science and Engineering 2018年第1期11卷 53-60页

作者： Payam Khosravinia Amir Malekpour Ali Hosseinzadehdalir Davod Farsadizadeh College of Agriculture University of KurdistanSanandaj 66177Iran College of Agricultural Sciences University of GuilanRasht 41996Iran College of Agriculture University of TabrizTabriz 51666Iran

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%-37% with different collar widths.

关键词： Scour development Equilibrium scour depth Trapezoidal collar wing-wall abutment Clear-water condition

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