<abstract xmlns="http://www.w3.org/1999/xhtml"><p>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.</p></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.

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

Journal of Hydrology and Hydromechanics

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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...

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

Pubblicato online: 13 feb 2020

Pagine: 70 - 82

Ricevuto: 15 lug 2019

Accettato: 17 dic 2019

DOI: https://doi.org/10.2478/johh-2019-0029

Parole chiave
Bridge pier, Ice cover, Local scour, Acoustic Doppler velocimetry (ADV), Horseshoe vortex

© 2020 Mohammad Reza Namaee et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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

Pubblicato online: 13 feb 2020

Pagine: 70 - 82

Ricevuto: 15 lug 2019

Accettato: 17 dic 2019

DOI: https://doi.org/10.2478/johh-2019-0029

Parole chiaveBridge pier, Ice cover, Local scour, Acoustic Doppler velocimetry (ADV), Horseshoe vortex

© 2020 Mohammad Reza Namaee et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Parole chiave
Bridge pier, Ice cover, Local scour, Acoustic Doppler velocimetry (ADV), Horseshoe vortex