Characterization of horseshoe vortex in a developing scour hole at a cylindrical bridge pier
Since local scour at bridge piers in rivers and estuaries is a major cause of bridge failure, estimation of the maximum local scour depth is of great importance to hydraulic and coastal engineers. Although numerous studies that focus on scour-depth prediction have been done and published, understand...
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sg-ntu-dr.10356-1522182021-07-23T01:50:48Z Characterization of horseshoe vortex in a developing scour hole at a cylindrical bridge pier Guan, Dawei Chiew, Yee-Meng Wei, Maoxing Hsieh, Shih-Chun School of Civil and Environmental Engineering Engineering::Civil engineering Sediment Transport Scour Since local scour at bridge piers in rivers and estuaries is a major cause of bridge failure, estimation of the maximum local scour depth is of great importance to hydraulic and coastal engineers. Although numerous studies that focus on scour-depth prediction have been done and published, understanding of the flow and turbulence characteristics of the horseshoe vortex that drives the scour mechanism in a developing scour hole still is immature. This study aims to quantify the detailed turbulent flow field in a developing clear-water scour hole at a circular pier using Particle Image Velocimetry (PIV). The distributions of velocity fields, turbulence intensities, and Reynolds shear stresses of the horseshoe vortex that form in front of the pier at different scour stages (t = 0, 0.5, 1, 12, 24, and 48 h) are presented in this paper. During scour development, the horseshoe vortex system was found to evolve from one initially small vortex to three vortices. The strength and size of the main vortex are found to increase with increasing scour depth. The regions of both the maximum turbulence intensity and Reynolds shear stress are found to form at a location upstream of the main vortex, where the large turbulent eddies have the highest possibility of occurrence. Results from this study not only provide new insight into the complex flow-sediment interaction at bridge piers, but also provide valuable experimental databases for advanced numerical simulations. The authors would like to thank Professors Robert Ettema and Subhasish Dey for their helpful discussions. Special thanks to the Associate Editor Professor Charles Melching for his thoughtful help in proofreading the manuscript. Anonymous reviewers are also acknowledged for their constructive comments. This research was supported by the Young Scientists Fund of the National Natural Science Foundation of China (51709082) and the Fundamental Research Funds for the Central Universities (2018B13014). 2021-07-23T01:50:48Z 2021-07-23T01:50:48Z 2018 Journal Article Guan, D., Chiew, Y., Wei, M. & Hsieh, S. (2018). Characterization of horseshoe vortex in a developing scour hole at a cylindrical bridge pier. International Journal of Sediment Research, 34(2), 118-124. https://dx.doi.org/10.1016/j.ijsrc.2018.07.001 1001-6279 https://hdl.handle.net/10356/152218 10.1016/j.ijsrc.2018.07.001 2 34 118 124 en International Journal of Sediment Research © 2018 International Research and Training Centre on Erosion and Sedimentation/the World Association for Sedimentation and Erosion Research (Published by Elsevier B.V.). All rights reserved. |
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Engineering::Civil engineering Sediment Transport Scour Guan, Dawei Chiew, Yee-Meng Wei, Maoxing Hsieh, Shih-Chun Characterization of horseshoe vortex in a developing scour hole at a cylindrical bridge pier |
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Since local scour at bridge piers in rivers and estuaries is a major cause of bridge failure, estimation of the maximum local scour depth is of great importance to hydraulic and coastal engineers. Although numerous studies that focus on scour-depth prediction have been done and published, understanding of the flow and turbulence characteristics of the horseshoe vortex that drives the scour mechanism in a developing scour hole still is immature. This study aims to quantify the detailed turbulent flow field in a developing clear-water scour hole at a circular pier using Particle Image Velocimetry (PIV). The distributions of velocity fields, turbulence intensities, and Reynolds shear stresses of the horseshoe vortex that form in front of the pier at different scour stages (t = 0, 0.5, 1, 12, 24, and 48 h) are presented in this paper. During scour development, the horseshoe vortex system was found to evolve from one initially small vortex to three vortices. The strength and size of the main vortex are found to increase with increasing scour depth. The regions of both the maximum turbulence intensity and Reynolds shear stress are found to form at a location upstream of the main vortex, where the large turbulent eddies have the highest possibility of occurrence. Results from this study not only provide new insight into the complex flow-sediment interaction at bridge piers, but also provide valuable experimental databases for advanced numerical simulations. |
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School of Civil and Environmental Engineering |
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School of Civil and Environmental Engineering Guan, Dawei Chiew, Yee-Meng Wei, Maoxing Hsieh, Shih-Chun |
format |
Article |
author |
Guan, Dawei Chiew, Yee-Meng Wei, Maoxing Hsieh, Shih-Chun |
author_sort |
Guan, Dawei |
title |
Characterization of horseshoe vortex in a developing scour hole at a cylindrical bridge pier |
title_short |
Characterization of horseshoe vortex in a developing scour hole at a cylindrical bridge pier |
title_full |
Characterization of horseshoe vortex in a developing scour hole at a cylindrical bridge pier |
title_fullStr |
Characterization of horseshoe vortex in a developing scour hole at a cylindrical bridge pier |
title_full_unstemmed |
Characterization of horseshoe vortex in a developing scour hole at a cylindrical bridge pier |
title_sort |
characterization of horseshoe vortex in a developing scour hole at a cylindrical bridge pier |
publishDate |
2021 |
url |
https://hdl.handle.net/10356/152218 |
_version_ |
1707050401912586240 |