Characterization of horseshoe vortex in a developing scour hole at a cylindrical bridge pier

作     者：Dawei Guan Yee-Meng Chiew Maoxing Wei Shih-Chun Hsieh 

作者机构：College of HarbourCoastal and Offshore EngineeringHohai University School of Civil and Environmental EngineeringNanyang Technological University 

出 版 物：《International Journal of Sediment Research》 (国际泥沙研究(英文版))

年 卷 期：2019年第34卷第2期

页      面：118-124页

核心收录：

学科分类：081406[工学-桥梁与隧道工程] 08[工学] 081502[工学-水力学及河流动力学] 0815[工学-水利工程] 0814[工学-土木工程] 082301[工学-道路与铁道工程] 0823[工学-交通运输工程] 

基　　金：supported by the Young Scientists Fund of the National Natural Science Foundation of China(51709082) the Fundamental Research Funds for the Central Universities(2018B13014) 

主　　题：Sediment transport Scour Bridge pier PIV Horseshoe vortex Turbulence Scour hole 

摘      要：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 *** 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 *** 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 *** scour development,the horseshoe vortex system was found to evolve from one initially small vortex to three *** strength and size of the main vortex are found to increase with increasing scour *** 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 *** 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.