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

Wu, Peng; Hirshfield, Faye; Sui, Jueyi; Wang, Jun; Chen, Pang-pang

doi:10.1016/s1001-6058(14)60002-0

Cited by 24 publications

(13 citation statements)

References 13 publications

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“…Under an ice-covered flow condition, the location of the maximum flow velocity gets closer to the channel bed, which increases the bed shear stress [18][19][20]. In conclusion, the presence of ice on the water surface makes the flow condition much more complicated than an open flow condition.…”

Section: Introductionmentioning

confidence: 97%

Velocity Field and Turbulence Structure around Spur Dikes with Different Angles of Orientation under Ice Covered Flow Conditions

Jafari

Sui

2021

Water

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Spur dikes are well-known structures that are widely used in rivers and coastal regions. Depending on their types, sizes, and orientation angles, spur dikes can substantially change flow characteristics. Results of previous studies indicate that the presence of an ice cover in rivers can cause complicated flow structures. The present experimental study investigates velocity fields and turbulence structures in the vicinity of spur dikes under ice cover with different roughness coefficients. The spur dikes were set up at the following three angles of orientation, 90°, 60°, and 45°. Our results show that the strongest velocity fluctuation occurs immediately above the scour hole surface and very close to the dike tip. The increase in the dike angle toward upstream, the velocity component values increase, leads to a larger scour hole. Results show that an increase in dike angle of each 10° (from 45° to 90°) increases the scour depth between 5% and 10%, depending on flow conditions. Furthermore, the increase in the cover roughness coefficient and the blockage ratio of a spur dike leads to a further increase in turbulence kinetic energy and 3D velocity components values. The findings of this study imply that the appearance of an ice cover can increase turbulence intensities up to nearly 30%.

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Section: Introductionmentioning

confidence: 97%

Velocity Field and Turbulence Structure around Spur Dikes with Different Angles of Orientation under Ice Covered Flow Conditions

Jafari

Sui

2021

Water

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“…Results show that with increase in densimetric Froude number, there is a corresponding increase in the scour depth. Results also showed that with increase in grain size of the armour layer, the maximum scour depth decreases and with increase in ice cover roughness, the maximum scour depth increases correspondingly (Wu et al, 2014).…”

Section: Introductionmentioning

confidence: 84%

“…Also, as pointed out by Wang et al (2015Wang et al ( , 2016, the appearance of bridge piers and abutments in channel has different impacts on ice accumulation under ice cover. Based on experiments in laboratory, Wu et al (2014) claimed that with the increase in ice cover roughness, scour depth bridge around bridge abutments increased, correspondingly. The impact of ice on sediment transport in a stream is typically most significant during ice formation and breakup (Ettema and Kempema, 2012;Sui et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

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Impact of armour layer on the depth of scour hole around side-by-side bridge piers under ice-covered flow condition

Namaee

Sui

2019

Journal of Hydrology and Hydromechanics

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In the present study, experiments were conducted in a large-scale flume to investigate the issue of local scour around side-by-side bridge piers under both ice-covered and open flow conditions. Three non-uniform sediments were used in this experimental study. Analysis of armour layer in the scour holes around bridge piers was performed to inspect the grain size distribution curves and to study the impact of armour layer on scour depth. Assessments of grain size of deposition ridges at the downstream side of bridge piers have been conducted. Based on data collected in 108 experiments, the independent variables associated with maximum scour depth were assessed. Results indicate that the densi-metric Froude number was the most influential parameter on the maximum scour depth. With the increase in grain size of the armour layer, ice cover roughness and the densimetric Froude number, the maximum scour depth around bridge piers increases correspondingly. Equations have been developed to determine the maximum scour depth around bridge piers under both open flow and ice covered conditions.

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“…Their results showed that the scour depth under rough ice-covered condition exceeds that under the open flow condition and that decreasing the flow depth increases the scour depth. Wu et al (2014Wu et al ( , 2015 also studied local scour finding that an increase in the particle size of the armor-layer resulted in a reduction in the depth of scour holes. Under rough ice-covered flow condition, the scour depth was found to be the largest.…”

Section: Introductionmentioning

confidence: 99%

Local scour around a bridge pier under ice-jammed flow condition – an experimental study

Wang

Hou

Sun

et al. 2021

Journal of Hydrology and Hydromechanics

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The appearance of an ice jam in a river crucially distorts local hydrodynamic conditions including water level, flow velocity, riverbed form and local scour processes. Laboratory experiments are used for the first time here to study ice-induced scour processes near a bridge pier. Results show that with an ice sheet cover the scour hole depth around a bridge is increased by about 10% compared to under equivalent open flow conditions. More dramatically, ice-jammed flows induce both greater scour depths and scour variability, with the maximum scour depth under an ice-jammed flow as much as 200% greater than under equivalent open flow conditions. Under an ice-jammed condition, both the maximum depth and length of scour holes around a bridge pier increase with the flow velocity while the maximum scour hole depth increases with ice-jam thickness. Also, quite naturally, the height of the resulting deposition dune downstream of a scour hole responds to flow velocity and ice jam thickness. Using the laboratory data under ice-jammed conditions, predictive relationships are derived between the flow’s Froude number and both the dimensionless maximum scour depth and the dimensionless maximum scour length.

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

Cited by 24 publications

References 13 publications

Velocity Field and Turbulence Structure around Spur Dikes with Different Angles of Orientation under Ice Covered Flow Conditions

Velocity Field and Turbulence Structure around Spur Dikes with Different Angles of Orientation under Ice Covered Flow Conditions

Impact of armour layer on the depth of scour hole around side-by-side bridge piers under ice-covered flow condition

Local scour around a bridge pier under ice-jammed flow condition – an experimental study

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