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Variation of Hydraulic Characteristics around a Cylindrical Bridge Pier with Circular Collar  

Jin, Byoung-Ho (서울시정개발연구원 도시환경연구부)
Sim, Ou-Bae (서울시정개발연구원 도시환경연구부)
Song, Jai-Woo (홍익대학교 토목공학과)
Publication Information
Journal of the Korean Society of Hazard Mitigation / v.3, no.2, 2003 , pp. 147-154 More about this Journal
Abstract
In this study, hydraulic characteristics around bridge piers were analyzed with and without collar through a hydraulic model experiment. The analysis of stage variation in front and back side of pier showed that collar installation did not function as obstacle to the stream flow. Little variation of water level between front and back sides of pier was observed before and after collar installation(0.2cm in front side and 0.1cm in back side of pier). Also, result that analyze velocity variation in front and back side of pier, lateral velocity(u) and transverse(v) before and after collar installation exhibited no alteration in the front and back side of pier. About 16.72% and 15.83% of vertical velocities(w) were reduced for the condition of y/d=0.33 in the front side of pier and y/d=0.67 in the back side of pier, respectively. This experimental results suggest that the collar installation around pier can minimize the local scouring depth by preventing the downflow that cause the pier scour.
Keywords
hydraulic characteristic; collar; scour; downflow;
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  • Reference
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