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隋觉义: Local scour around side-by-side bridge piers under ice-covered conditions–experimental study and numerical simulation
发布日期:2019-07-02  字号:   【打印

报告时间:2019年7月2日(星期二)15:00

报告地点:纬地楼515

  :隋觉义 教授

工作单位:加拿大北英属哥伦比亚大学

举办单位:土木与水利工程学院

报告人简介

隋觉义教授主要从事河流冰凌水力学及河流泥沙等研究。1993年获得德国学术交流中心(DAAD) 奖学金(为期5年),1999年获得加拿大国家自然科学及工程研究基金博士后奖学金(为期2年),2013年, 1篇论文获得国际泥沙学会卓越研究论文奖。2011年和2014年, 先后2次获得北英属哥伦比亚大学优秀研究奖。近年来主持3项加拿大国家自然科学基金项目。共发表论文/报告140多篇(个)。其中,出版专著一本(德文),书4章。在国际学术期刊(SCI 检索)发表论文72篇,部分成果在国际上具有带动作用。自2011年起,International Journal of Sediment Research (IF=1.97)杂志副主编,Journal of Hydrology and Hydromechanics(IF=1.2.02)杂志副主编, Journal of Hydrodynamics (IF=1.67) 执行编委, 加拿大国家自然科学基金评审组专家,为42个国际杂志评审了208篇论文。先后获得Journal of Hydrology, Geomorphology, Ocean Engineering, Cold Region Sciences and Technology and Canadian Journal of Civil Engineering 卓越评审人。自2012年起,被德国学术交流中心聘为研究大使。

报告简介

Local scour around piers and abutments is one of the main causes of the collapse of many bridges constructed inside rivers. The most severe cases of bridge pier scouring occur in cold regions when the surface of water turns into ice, since ice cover causes the maximum flow velocity to move closer to the channel bed. A precise prediction of maximum scour depth at piers under ice cover flow conditions is crucial for the safe design of the bridge foundation. In the current study, a set of flume experiments was completed investigating local scour around four pairs of circular bridge piers with non-uniform bed under open channel, smooth and rough ice cover conditions. To represent non-uniform sediment condition, three different bed materials were used. Results showed that, regardless of flow cover, the maximum scour depth decreases with an increase in the grain size of armor layer. The vertical velocity distribution which is a representative of the strength of downfall velocity was the greatest under rough ice cover. Under the same flow conditions, the maximum value of turbulence kinetic energy and turbulent intensity occurred at the largest diameter pier. Several empirical equations were developed to estimate the maximum scour depth around side-by-side bridge piers under both open channel and ice-covered flow conditions. In addition to the experimental study, the numerical study was also done for the finest and the coarsest sediment types. The numerical study was in good agreement with the experimental study.

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