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Velocity profiles and turbulence intensities around side-by-side bridge piers under ice-covered flow condition

Authors
  • Namaee, Mohammad Reza1
  • Sui, Jueyi1
  • 1 University of Northern British Columbia, Canada , (Canada)
Type
Published Article
Journal
Journal of Hydrology and Hydromechanics
Publisher
Sciendo
Publication Date
Feb 13, 2020
Volume
68
Issue
1
Pages
70–82
Identifiers
DOI: 10.2478/johh-2019-0029
Source
De Gruyter
Keywords
License
Green

Abstract

Recent studies have shown that the presence of ice cover leads to an intensified local scour pattern in the vicinity of bridge piers. To investigate the local scour pattern in the vicinity of bridge pier under ice-covered flow condition comparing to that under open channel flow condition, it is essential to examine flow field around bridge piers under different flow conditions. In order to do so, after creation of smooth and rough ice covers, three-dimensional timeaveraged velocity components around four pairs of bridge piers were measured using an Acoustic Doppler velocimetry (ADV). The ADV measured velocity profiles describe the difference between the velocity distributions in the vicinity of bridge piers under different covered conditions. Experimental results show that the vertical velocity distribution which represents the strength of downfall velocity is the greatest under rough covered condition which leads to a greater scour depth. Besides, results show that the turbulent intensity increases with pier size regardless of flow cover, which implies that larger scour depth occurs around piers with larger diameter.

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