Effect of Distance of the Submerged Vanes from the Outer Bank on Sediment Movement within 180&amp;deg; Bend

Maatooq, Jaafar S.; Adhab, Barq A.

doi:10.3844/ajeassp.2017.679.684

Cited by 5 publications

(3 citation statements)

References 7 publications

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“…Among the different design parameters of submerged vanes, the angle of attack of the vane with the ow is an important parameter, and it has been the subject of various investigations. For example, many researchers studied the effect of vane angle of attack to control and reduce scour [6, 10,13,19,24,25,30,31,32,34,38,40,43,45,46].…”

Section: Application Of Submerged Vanesmentioning

confidence: 99%

Influence of different skew angles of the submerged vane on pressure flushing performance

Beiramipour

Qaderi

Rahimpour

et al. 2022

Preprint

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Siltation is a major threat to the original storage capacity and lifespan of a reservoir. Pressure flushing is an effective measure against siltation through the partial drawdown of the reservoir water level with limited flushed cone volumes in front of the bottom outlet. In this study, a novel configuration with submerged vanes has been proposed and tested experimentally to increase the flushed sediment volume during the pressure flushing operation. In the new configuration, submerged vanes aligned with ten skew angles (θ) of 10°, 20°, 30°, 45°, 70°, 110°, 135°, 150°, 160°, and 170° to flow direction in non-cohesive sediment bed materials were conducted. The results showed that in 45° ≤ θ ≤ 160°, increasing the skew angle increased the flushing cone geometry. The minimum and maximum flushing cone dimensions and volume occurred at skew angles of θ = 45° and 135° ≤ θ ≤ 160° around the bottom outlet. Eventually, nonlinear regression analysis yielded an equation for estimating flushing cone volumes. The developed equation was tested in real case studies of a target reservoir, and an acceptable correlation between calculated and experimental results was obtained.

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Section: Application Of Submerged Vanesmentioning

confidence: 99%

Influence of different skew angles of the submerged vane on pressure flushing performance

Beiramipour

Qaderi

Rahimpour

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…The results of their study indicated a desirable relationship between experimental and numerical results. Maatooq and Adhab (2017) analyzed the effect of the distance of the submerged vanes from the outer bank of the channel on sediment reach along the channel. To this aim, they installed the submerged vanes at different distances from the outer bank in a 180 degree bended channel.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Effect of Displacement of Vanes Submerged at Channel Width on Distribution of Velocity and Shear Stress in a 180 Degree Bend

Chooplou

Vaghefi

2019

JAFM

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Shear stress is a parameter of high significance. Through knowledge of this parameter, assessment of scour or sedimentations at different points of bed is made viable. Therefore, this paper investigated alterations in shear stress along the bend, specifically around a bridge pier, under the influence of applying submerged vanes at the upstream side of the bridge pier. With the aim of modeling submerged vanes, vanes of Plexiglas with a thickness of 20% of the pier diameter, a length of 1.5 times the pier diameter, and submergence ratio of 75% were utilized. The vanes were installed at a distance equal to 5 times the pier diameter from the pier center at a distance of 40 to 60% of the channel width from the inner bank at the upstream side of the bridge pier. Acoustic-Doppler Velocity velocimeter device was utilized for measuring three-dimensional velocity components. The experiments were conducted in a 1-meter-wide flume with a degree of curvature of 180. The results of the study suggested that upon reaching the bend apex, the maximum flow turbulence rate occurred in a transverse direction in the case of installing submerged vanes at a distance of 40% of the channel width from the inner bank towards the inner wall; while in the case of installing submerged vanes at a distance of 60% of the channel width from the inner bank, it occurred towards the outer wall, and it could be observed that the maximum longitudinal and vertical components of turbulence rate increased by 16 and 5.5% respectively upon increase in the distance of submerged vanes from the inner bank. Furthermore, the values of uw    and uv    turbulence shear stresses at the outer bank in the case of installing the vanes at a distance of 40% of the channel width from the inner bank were smaller than those in the case of installing the submerged vanes at a distance of 60% of the channel width from the inner bank.

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“…As a result, the riverbed degrades in one portion of the channel cross-section and degrades in another. Generally, submerged vanes are used for river channel stabilization, bank protection, shoaling amelioration, control and reduction of scour, and sedimentation at diversions and water intakes [13][14][15][16][17][18][19][20] . Additionally, submerged vanes can be used to increase the turbulence of flows upstream of the bottom outlets of reservoirs and, finally, to increase the amount of evacuated sediment.…”

mentioning

confidence: 99%

Influence of different skew angles of the submerged vane on pressure flushing performance

Beiramipour,

Kantoush,

Haghjouei

et al. 2023

Sci Rep

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Siltation significantly threatens a reservoir’s original storage capacity and lifespan. Pressure flushing is an effective measure against siltation through the partial drawdown of the reservoir water level with limited flushed cone volumes in front of the bottom outlet. In this study, a novel configuration with submerged vanes has been proposed and tested experimentally to increase the flushed sediment volume during pressure flushing. In the new configuration, submerged vanes aligned with ten skew angles (θ) of 10°, 20°, 30°, 45°, 70°, 110°, 135°, 150°, 160°, and 170° to the flow direction in noncohesive sediment bed materials were used. The results showed that increasing the skew angle at 45° ≤ θ ≤ 160° increased the flushing cone geometry. The minimum and maximum flushing cone dimensions and volume occurred at skew angles of θ = 45° and 135° ≤ θ ≤ 160° around the bottom outlet. The sediment flushing volume in the presence of submerged vanes at 135° ≤ θ ≤ 160° increased 25 times compared to tests without submerged vanes. Eventually, nonlinear regression analysis yielded an equation for estimating flushing cone volumes. The developed equation was tested in real case studies of a target reservoir, and an acceptable correlation between the calculated and experimental results was obtained.

show abstract

Effect of Distance of the Submerged Vanes from the Outer Bank on Sediment Movement within 180° Bend

Cited by 5 publications

References 7 publications

Influence of different skew angles of the submerged vane on pressure flushing performance

Influence of different skew angles of the submerged vane on pressure flushing performance

Experimental Study of the Effect of Displacement of Vanes Submerged at Channel Width on Distribution of Velocity and Shear Stress in a 180 Degree Bend

Influence of different skew angles of the submerged vane on pressure flushing performance

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