A Hooked-Collar for Bridge Piers Protection: Flow Fields and Scour
AbstractA new type of collar, the hooked-collar, was studied through experiments and numerical methods. Tests were conducted using a hooked collar of a width of 1.25b and a height of 0.25b, where b is the bridge-pier width. The hooked-collar efficiency was evaluated by testing different hooked-collar placements within the bridge-pier, which were compared to the bridge-pier without any collar. A double hooked-collar configuration, one placed at the bed level and the other buried 0.25b, was the most efficient at reducing the scour hole. In other cases, a hooked-collar positioned 0.25b above the bed slightly reduced the scour hole and had similar scour patterns when compared to the pier without the hooked-collar. The flow fields along the vertical symmetrical plane in the experiments are also presented. Laboratory experiments and numerical tests show that maximal downflow is highly reduced along with a corresponding decrease in horseshoe vortex strength for the experiments with the hooked-collar, compared to cases without the hooked-collar. The flow fields reveal that the maximum turbulent kinetic energy decreases with the installation of the hooked-collar. View Full-Text
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Chen, S.-C.; Tfwala, S.; Wu, T.-Y.; Chan, H.-C.; Chou, H.-T. A Hooked-Collar for Bridge Piers Protection: Flow Fields and Scour. Water 2018, 10, 1251.
Chen S-C, Tfwala S, Wu T-Y, Chan H-C, Chou H-T. A Hooked-Collar for Bridge Piers Protection: Flow Fields and Scour. Water. 2018; 10(9):1251.Chicago/Turabian Style
Chen, Su-Chin; Tfwala, Samkele; Wu, Tsung-Yuan; Chan, Hsun-Chuan; Chou, Hsien-Ter. 2018. "A Hooked-Collar for Bridge Piers Protection: Flow Fields and Scour." Water 10, no. 9: 1251.
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