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Water 2018, 10(9), 1251; https://doi.org/10.3390/w10091251

A Hooked-Collar for Bridge Piers Protection: Flow Fields and Scour

1
Innovation and Development Centre of Sustainable Agriculture (IDCSA), Department of Soil and Water Conservation, National Chung Hsing University, Taichung City 402, Taiwan
2
Department of Soil and Water Conservation, National Chung Hsing University, Taichung City 402, Taiwan
3
Geotechnical Engineering Office, Public Works Department, Taipei City 110, Taiwan
4
Department Civil Engineering, National Central University, Taoyuan City 320, Taiwan
*
Author to whom correspondence should be addressed.
Received: 30 July 2018 / Revised: 11 September 2018 / Accepted: 12 September 2018 / Published: 14 September 2018
(This article belongs to the Section Hydraulics)
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Abstract

A 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
Keywords: bridge; collar; hooked-collar; pier; scour bridge; collar; hooked-collar; pier; scour
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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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.

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