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Impacts of ice cover on local scour around semi-circular bridge abutment

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Journal of Hydrodynamics 2014年第1期26卷 10-18页

作者： WU Peng HIRSHFIELD Faye SUI Jueyi 王军陈胖胖 Environmental Engineering University of Northern British Columbia School of Civil Engineering Hefei University of Technology

The presence of ice cover in winter can significantly change the flow field around bridge abutments, which can also cause a different local scour pattern. To investigate the impacts of ice cover, results from a recent flume experiments were presented. Smooth and rough ice covers were created to investigate the impacts of ice cover roughness on the scour geometry around the semi-circular abutment. Three bed materials were used, with 50D s of 0.58 mm, 0.50 mm, 0.47 mm respectively. scour volume and scour area were calculated. It was found that the maximum scour depth was located 75o inclined to the flume wall. Under rough ice cover, the scour area and scour depth were the largest. An empirical equation on the maximum scour depth was also developed.

关键词： ice cover local scour semi-circular abutment maximum scour depth scour pattern

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Experimental investigation and flow analysis of clear-water scour around pier and abutment in proximity

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Water Science and Engineering 2023年第1期16卷 94-105页

作者： Mohammad Saeed Fakhimjoo Abdollah Ardeshir Kourosh Behzadian Hojat Karami Department of Civil and Environmental Engineering Amirkabir University of TechnologyTehran 15875-4413Iran School of Computing and Engineering University of West LondonLondon W55RFUK Department of Civil Engineering Semnan UniversitySemnan 35131-19111Iran

Local scour around bridge piers and abutments is one of the most significant causes of bridge *** a plethora of studies on scour around individual bridge piers or abutments,few studies have focused on the joint impact of a pier and an abutment in proximity to one another on *** study conducted laboratory experiments and flow analyses to examine the interaction of piers and abutments and their effect on clear-water *** experiments were conducted in a rectangular laboratory *** included 18 main tests(with a combination of different types of piers and abutments)and five control tests(with individual piers or abutments).Three pier types(a rectangular pier with a rounded edge,a group of three cylindrical piers,and a single cylindrical pier)and two abutment types(a wingewall abutment and a semicircular abutment)were *** acoustic Doppler velocimeter was used to measure the three-dimensional flow velocity for analyses of streamline,velocity magnitude,vertical velocity,and bed shear *** results showed that the velocity near the pier and abutment increased by up to 80%.The maximum scour depth around the abutment increased by up to 19%.In contrast,the maximum scour depth around the pier increased significantly by up to l71%.The presence of the pier in the vicinity of the abutment led to an increase in the scour hole volume by up to 87%relative to the case with a solitary *** equations were also derived to accurately estimate the maximum scour depth at the pier adjacent to the abutment.

关键词： Abutment ADV Bridge scour Laboratory experiment maximum scour depth Pier

Local scour around two side-by-side cylindrical bridge piers under ice-covered conditions

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International Journal of Sediment Research 2019年第4期34卷 355-367页

作者： Mohammad reza Namaee Jueyi Sui Environmental Engineering Program University of Northern British Columbia

In the current study, 108 flume experiments with non-uniform, cohesionless sediments have been done to investigate the local scour process around four pairs of side-by-side bridge piers under both open channel and ice-covered flow conditions. Similar to local scour around bridge piers under open channel conditions and a single bridge pier, it was observed in the experiments that the maximum scour depth always occurred at the upstream face of the pier under ice-covered conditions. Further, the smaller the pier size and the greater the spacing distance between the bridge piers, the weaker the horseshoe vortices around the bridge piers, and, thus, the shallower the scour holes around them. Finally, empirical equations were developed to estimate the maximum scour depth around two side-by-side bridge piers under both open channel and ice-covered flow conditions.

关键词： Bridge pier Local scour maximum scour depth Non-uniform sediment Roughness of cover scour pattern

Local scour around bridge abutments under ice covered condition-an experimental study

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International Journal of Sediment Research 2015年第1期30卷 39-47页

作者： Peng WU Faye HIRSHFIELD Jue-yi SUI Environmental Engineering Program University of Northern British Columbia

The local scour around bridge abutments has been an active research topic for many *** very few studies have been conducted regarding the impacts of ice cover on the local scour phenomenon around bridge abutments.A series of ice covered flume experiments were conducted in this *** shape factors of different abutment types in the local scour were *** ice cover,the shape factor for semi-circular abutments ranges from 0.66～*** different non-uniform sediments were used with D50s of 0.58 mm,0.50 mm,and0.47 mm *** types of ice cover,namely smooth and rough cover,were created to simulate the impacts of ice cover around the *** scour depth was analyzed under different *** contours of the scour holes were plotted to show the bed morphology and sediment deposition around bridge *** empirical relationship between maximum scour depth,densimetric Froude number and sediment size was developed.

关键词： Bridge abutment Ice cover Local scour maximum scour depth