Experimental study of debris-induced scour around a slotted bridge pier

Hamidifar, Hossein; Nezhadian, Damoon Mohammad Ali; Carnacina, Iacopo

doi:10.1007/s11600-021-00722-2

Cited by 11 publications

(6 citation statements)

References 79 publications

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“…Additionally, the presence of the slot in the pier contributes to a decrease in shear stress in the slotted model which is in good agreement by the findings of [35]. The altered flow regime caused by slots can promote the formation of vortices or eddies, which act as hydraulic barriers against scour [42]. These vortices generate circulating currents that deflect sediment transport away from the bridge foundations, reducing the scour potential [48].…”

Section: Discussionsupporting

confidence: 84%

“…Nevertheless, despite these challenges, the use of slots as a scour countermeasure holds great potential. Research studies and field applications have demonstrated the effectiveness of slots in reducing scour depths and extending the service life of bridge foundations [42]. By harnessing the power of hydraulic engineering principles, slots provide a proactive and sustainable solution to mitigate scouring around bridge piers, ensuring the structural integrity and safety of bridges in riverine environments [48].…”

Section: Discussionmentioning

confidence: 99%

“…In this study, the data used for investigating scour around bridge foundations in the presence of floating debris and a slot were derived from laboratory experiments conducted by [42]. The experiments took place in a flume with dimensions of 9 m in length, 0.4 m in width, and 0.6 m in height.…”

Section: Methodsmentioning

confidence: 99%

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Effects of Floating Debris on Flow Characteristics around Slotted Bridge Piers: A Numerical Simulation

Mohammad Ali Nezhadian,

Hamidifar

2023

Water

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Bridge pier scouring is a significant concern in hydraulic engineering, requiring thorough investigation under various conditions to estimate maximum scour depth and mitigate the risk of bridge failure. This study aims to conduct a numerical simulation of flow around a bridge pier with slots in the presence of floating debris, with the objective of analyzing variations in parameters such as velocity, shear stress, turbulent intensity, and turbulent kinetic energy. The FLOW−3D software package (Version 11), along with the k−ε (RNG) turbulence model, was employed for the simulation. The results indicate that the presence of a slot in the bridge pier provided a smooth pathway for the flow, resulting in a reduction in the pressure gradient and alleviating the negative impacts on the flow. This, in turn, led to a decrease in the velocity of the flow. Additionally, turbulence intensity around the pier ranges between 0 and 49, while turbulent kinetic energy varies from 0 to 0.005. The findings reveal that models without slots exhibit higher turbulence and vorticity levels, as well as greater flow separation, compared to models with slots. This disparity can be attributed to the slot’s ability to neutralize detrimental lateral and downward flows. Furthermore, the results demonstrate a gradual decrease in shear stress as the flow approaches slotted bridge piers, accompanied by a reduction in vortex intensity. These findings suggest that the accumulation of floating debris can counteract the influence of slots in reducing scour around bridge piers, necessitating thorough consideration during the design phase.

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Section: Discussionsupporting

confidence: 84%

Section: Discussionmentioning

confidence: 99%

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Effects of Floating Debris on Flow Characteristics around Slotted Bridge Piers: A Numerical Simulation

Mohammad Ali Nezhadian,

Hamidifar

2023

Water

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“…Terefore, debris accumulation reduces the efciency of sacrifcial piles. In the literature, there are several studies that have investigated the efect of debris accumulation [53][54][55]. It should be noted that in this study, the efect of debris accumulation on the efciency of sacrifcial piles was not studied.…”

Section: Performance Of the Bsspmentioning

confidence: 91%

Efficacy of the Combined Use of Bed Sill and Sacrificial Piles to Control Local Scour around Circular Bridge Piers

Javidi Vahdati,

Ahmadi,

Abedini

et al. 2024

Shock and Vibration

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In this study, the results are presented and discussed from laboratory test campaigns specifically designed to investigate the behavior of sacrificial piles as a countermeasure against local scouring at a circular bridge pier and clear-water conditions with flow intensity slightly below the threshold of sediment motion. Sacrificial piles are assessed on the upstream side of the pier in two transverse and triangular arrangements. Piles can reduce scouring by deflecting the flow and creating a low-velocity wake region behind them. The efficiency of the piles against local scouring depends on the diameter of the piles, the number of piles, and the angle of the wedge. The investigation was aimed at evaluating the effectiveness of the sacrificial piles as a function of different dimensionless groups. It was found that the triangular arrangement of sacrificial piles has better results than the transverse arrangement. The results showed that the triangular sacrificial piles reduced the maximum local scour depth at the pier to 37.2% in the best configuration. Combined countermeasures were tested, which were composed of sacrificial piles and a bed sill downstream of the pier; in the best configuration, the scour depth reduction in front of the pier reached 51.1%. The increased efficiency of the combination of bed sill and sacrificial piles (BSSP) is an advantage that can reduce the risk of pier failure when the duration of the flood is short. This last result shows that a combination of BSSP may be a very effective countermeasure against local scouring at bridge piers. Finally, the coherent turbulent flow structure around the best combination of BSSP was investigated, and its effect on the bed scouring pattern was studied. A 3D analysis of the bursting process was used. Turbulence characteristics, as well as the occurrence and transition probabilities of bursting events, were calculated. The obtained results confirmed the quite effective effect of the combination of these two countermeasures in reducing the scour depth.

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“…The river's hydro-morphology is driven by both bedload and suspended load, which is especially impactful for engineers. For example, Hamidifar et al (2022) investigated scour countermeasures around piers by using different shapes of slots. Another engineering problem with sediments is how to sample them, particularly in the case of the material moving close to the bed.…”

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confidence: 99%

Experimental methods and instrumentation in hydraulics

et al. 2022

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Experimental study of debris-induced scour around a slotted bridge pier

Abstract: The version presented here may differ from the published version or from the version of the record. Please see the repository URL above for details on accessing the published version and note that access may require a subscription.

Cited by 11 publications

References 79 publications

Effects of Floating Debris on Flow Characteristics around Slotted Bridge Piers: A Numerical Simulation

Effects of Floating Debris on Flow Characteristics around Slotted Bridge Piers: A Numerical Simulation

Efficacy of the Combined Use of Bed Sill and Sacrificial Piles to Control Local Scour around Circular Bridge Piers

Experimental methods and instrumentation in hydraulics

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