Experimental analysis of submerged vanes' configuration for mitigating local scour at piers in a sharp bend: Influence of quantity, length, and orientation

Vaghefi, Mohammad; Zarei, Elham; Ahmadi, Goodarz; Behroozi, Abdol Mahdi

doi:10.1016/j.oceaneng.2023.116267

Cited by 6 publications

References 33 publications

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An experimental comparison of 3D velocity components around single and twin piers installed in a sharp bend under the influence of upstream implemented vanes

Safaripour,

Vaghefi,

Mahmoudi

2024

Appl Water Sci

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To reduce the trend of scouring, understanding the flow pattern around the bridge piers is necessary. By using hydraulic structures such as submerged vanes, it is possible to alter the flow pattern of water, thus scouring process and sediment transport in riverbeds. Since the scouring mechanism for pier groups differs from single pier, experiments were conducted in a 180° sharp bend channel in the laboratory to investigate the flow pattern around pier group and single pier under the influence of 25% submerged vanes. Furthermore, a comparison was made between the flow patterns in single pier and pier group conditions. Three-dimensional velocities along the bend and different depths were measured using an Acoustic Doppler Velocimeter (ADV(. The results suggest that the maximum vorticity value at the apex position of the bend (location of piers) and the maximum secondary flow value, at the distance between the piers and the vanes, were found to be, 0.15 and 0.89, respectively. In the twin pier experiment, the maximum Reynolds shear stress value $${\tau }_{yx}$$ τ yx decreased by about 36%, and the minimum value decreased by about 49% compared to the single pier experiment. The final results indicated that using submerged vanes obtained the maximum $${\tau }_{yx}$$ τ yx and $${\tau }_{zx}$$ τ zx near the vanes. Near the bed and mid-depth of the water flow, the geometric location of the maximum velocity also occurred around the vanes in both experiments. Therefore, the vanes are important in altering the water flow pattern, diverting the flow from around piers and consequently reducing the bridge pier scouring.

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An experimental comparison of 3D velocity components around single and twin piers installed in a sharp bend under the influence of upstream implemented vanes

Safaripour,

Vaghefi,

Mahmoudi

2024

Appl Water Sci

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Experimental investigation of temporal evaluations of scouring downstream of culvert

Jafari,

Vaghefi,

Mahmoudi

2024

Appl Water Sci

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The investigation of bed topography downstream of culverts is very important. Since bed topography goes through extreme changes through time, this study investigated the temporal evaluations of bed topography. Also, the bed level downstream of culverts, as one of effective parameters in topography in different time spans, was investigated. One of the most important findings of the study is that with increasing the experiment time and approaching the equilibrium moment, the change percentage of the maximum scour depth decreased. Also with changes to and decrease in the bed level downstream of the culvert, the change percentage of the depth scour decreased. Another salient finding of this study was that the maximum scour over the beginning durations of the tests in case of equal downstream level and culvert bed level was approximately equal to the maximum scour in cases where the downstream bed level differed from the culvert bed level by 0.067 and 0.13 times the culvert mouth width.

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Flow turbulence and morphological characteristics in an asymmetric alluvial sinuous channel

Gurugubelli,

Timbadiya,

Barman

2024

Ocean Engineering

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Experimental analysis of submerged vanes' configuration for mitigating local scour at piers in a sharp bend: Influence of quantity, length, and orientation

Cited by 6 publications

References 33 publications

An experimental comparison of 3D velocity components around single and twin piers installed in a sharp bend under the influence of upstream implemented vanes

An experimental comparison of 3D velocity components around single and twin piers installed in a sharp bend under the influence of upstream implemented vanes

Experimental investigation of temporal evaluations of scouring downstream of culvert

Flow turbulence and morphological characteristics in an asymmetric alluvial sinuous channel

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