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Suction Effects on Bridge Pier Scour under Clear-Water Conditions

Qi, Min / Chiew, Yee-Meng / Hong, Jian-Hao

The experimental study investigates how the application of point suction at different bed locations affects local scour around a cylindrical bridge pier under clear-water conditions. The results show that suction has a profound effect on pier-scour development, and the extent of the influence is related to the location of the suction source. When the suction source is located at or upstream of the pier, the equilibrium scour depth is reduced by up to 50%, with $Q_{s} / Q_{o} = 2 %$ , where $Q_{s}$ and $Q_{o}$ = suction flow rate and undisturbed approach flow rate, respectively. The data also show that for the suction source that is located downstream of the pier, the equilibrium scour depth is reduced by up to 30% with the same suction flow rate. The extent of pier-scour depth reduction at different locations from the suction source is closely associated with changes to the local effective shear and critical shear velocity. Results of this study show that bed suction may be used as an effective pier-scour countermeasure.

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Suction Effects on Bridge Pier Scour under Clear-Water Conditions

Qi, Min / Chiew, Yee-Meng / Hong, Jian-Hao

The experimental study investigates how the application of point suction at different bed locations affects local scour around a cylindrical bridge pier under clear-water conditions. The results show that suction has a profound effect on pier-scour development, and the extent of the influence is related to the location of the suction source. When the suction source is located at or upstream of the pier, the equilibrium scour depth is reduced by up to 50%, with $Q_{s} / Q_{o} = 2 %$ , where $Q_{s}$ and $Q_{o}$ = suction flow rate and undisturbed approach flow rate, respectively. The data also show that for the suction source that is located downstream of the pier, the equilibrium scour depth is reduced by up to 30% with the same suction flow rate. The extent of pier-scour depth reduction at different locations from the suction source is closely associated with changes to the local effective shear and critical shear velocity. Results of this study show that bed suction may be used as an effective pier-scour countermeasure.

Suction Effects on Bridge Pier Scour under Clear-Water Conditions

Qi, Min / Chiew, Yee-Meng / Hong, Jian-Hao

The experimental study investigates how the application of point suction at different bed locations affects local scour around a cylindrical bridge pier under clear-water conditions. The results show that suction has a profound effect on pier-scour development, and the extent of the influence is related to the location of the suction source. When the suction source is located at or upstream of the pier, the equilibrium scour depth is reduced by up to 50%, with $Q_{s} / Q_{o} = 2 %$ , where $Q_{s}$ and $Q_{o}$ = suction flow rate and undisturbed approach flow rate, respectively. The data also show that for the suction source that is located downstream of the pier, the equilibrium scour depth is reduced by up to 30% with the same suction flow rate. The extent of pier-scour depth reduction at different locations from the suction source is closely associated with changes to the local effective shear and critical shear velocity. Results of this study show that bed suction may be used as an effective pier-scour countermeasure.

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Title:

Suction Effects on Bridge Pier Scour under Clear-Water Conditions

Contributors:

Qi, Min (author) / Chiew, Yee-Meng (author) / Hong, Jian-Hao (author)

Published in:

Journal of Hydraulic Engineering ; 139 ; 621-629

Publication date:

2012-11-21

Size:

92013-01-01 pages

ISSN:

0733-9429 , 1943-7900

DOI:

https://doi.org/10.1061/(ASCE)HY.1943-7900.0000711

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

English

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