Scour depth at inclined bridge piers along a straight path: A laboratory study

Karimi, Negin; Heidarnejad, Mohammad; Masjedi, Alireza

doi:10.1016/j.jestch.2017.07.004

Cited by 20 publications

(13 citation statements)

References 9 publications

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“…By assuming that, they considered the scouring equilibrium was reached. Bozkus and Yildiz [78] and Karimi et al [79] found it was appropriate to reach the equilibrium state after 2 hours of scouring. However, Aksoy et al [43] concluded that data obtained for less time, such as 10 hours, could underestimate scour depth as much as 50% of the equilibrium scour depth.…”

Section: Finite Timementioning

confidence: 99%

Local Scour for Vertical Piles in Steady Currents: Review of Mechanisms, Influencing Factors and Empirical Equations

Liang

Pan

et al. 2019

JMSE

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Scour induced by currents is one of the main causes of the bridge failure in rivers. Fundamental knowledge and mechanisms on scour processes due to currents are often taken as a basis for scour studies, which are the focus of this review. Scour development induced by waves and in combined wave–current conditions are also briefly discussed. For the design of structure foundations, the maximum scour depths need to be estimated. The mechanisms of local scour and predictions of maximum local scour depths have been studied extensively for many years. Despite the complexity of the scour process, a lot of satisfying results and progresses have been achieved by many investigators. In order to get a comprehensive review of local scour for vertical piles, major progresses made by researchers are summarized in this review. In particular, maximum scour depth influencing factors including flow intensity, sediments, pile parameters and time are analyzed with experimental data. A few empirical equations referring to temporary scour depth and maximum scour depth were classified with their expressing forms. Finally, conclusions and future research directions are addressed.

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Section: Finite Timementioning

confidence: 99%

Local Scour for Vertical Piles in Steady Currents: Review of Mechanisms, Influencing Factors and Empirical Equations

Liang

Pan

et al. 2019

JMSE

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“…As suggested by the results of their study, despite SSIIM numerical model's success in estimating the scour hole at the foot of the adjacent piers, it overestimated the scour depth between the piers [22]. Karimi et al, carried out an experimental investigation of the effect of the bridge pier's inclination angle on the process of scour in a straight channel [23]. Khaple et al, experimentally studied the position of grouped circular piers in a straight path under clear water conditions.…”

Section: Introductionmentioning

confidence: 95%

Experimental and Numerical Comparison of Flow and scour Patterns around a Single and Triple Bridge Piers Located at a sharp 180 degrees Bend

2019

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Placement of bridge piers along rivers creates a complex 3D flow pattern which disrupts normal river flow and the resulted turbulence erodes alluvial sediments around the pier. In this research, SSIIM model has been used to simulate flow and scour patterns when no pier, one pier, and triple piers are placed at a 180 degrees bend and the results are compared with those of experiments. The piers are vertical. The simulated channel was 1 m wide with a U-turn having the relative curvature radius of 2 carrying a volumetric flow of 70 l/s the flow depth at the beginning of the bend is 18 cm. Results showed that SSIIM is well capable of simulating bed form changes and flow patterns such that at the bend with triple piers error in maximum scour and sedimentation was only 4%, in maximum transverse velocity 12%, in maximum longitudinal velocity 13%, and in maximum vertical velocity 19%. In general, SSIIM model satisfactorily 2 simulates the location and value of local scour arising from single and series piers in numerical simulation of the flow and scour. In flow pattern simulation, the errors and differences are greater under moving bed conditions than a rigid bed.

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“…Many researchers from the past so far have been trying to study the structure of the flow around the bridge piers with numerical and experimental methods. These include Dey and Raikar (2007), Kirkil et al (2008), Rodriguez and Garcia (2008), Belcher and Fox (2009), Beheshti and Ataie-Ashtiani (2010), Kirkil and Constantinescu (2010), Şarlak and Tiğrek (2011), Kumar et al (2012), Ataie-Ashtiani and Aslani-Kordkandi (2012, 2013, Das et al (2013aDas et al ( , 2013b, Das and Mazumdar (2015), Ma et al (2015), Beheshti and Ataie-Ashtiani (2016), , Ma et al (2016), Karimi et al (2017), Khan et al (2017) in the straight path and also Naji Abhari et al (2010), Barbhuiya and Talukdar (2010), Constantinescu et al (2011), Uddin and Rahman (2012), Tang and Knight (2014), Vaghefi et al (2015), Vaghefi et al (2016), Ben Mohammad Khajeh et al (2017, Dey et al (2017), Vaghefi et al (2017), Abdi Chooplou et al (2018), Gholami et al (2019) in the bend. Considering that previous studies have shown that there was no comprehensive study on flow pattern around the bridge pier with collar in the case of placement in bend, it is important to understand the pattern of the flow around the bridge pier protected by collar.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Effect of Increasing the Collar Thickness on the Flow Pattern around the Oblong Pier in 180˚ Sharp Bend with Balanced Bed

moghanloo¹,

Vaghefi

Ghodsian

2020

JAFM

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In this paper, the effect of increase collar thickness has been investigated by considering other parameters affecting the flow pattern around the oblong bridge pier located at 90˚ from the 180˚ bend constant. Data acquisition was performed using the Vectrino 3D velocimeter. The leveling of the collar in both tests is constant and 0.4 times the pier diameter above the initial bed surface. The flow conditions were close to the motion threshold and bed balanced. The results showed that with an increase in the thickness of the collar by a factor of 4, the barrier surface is located in the flow path and the flow is deviated to the bed by colliding with the edge of the collar. This flow deviation that was due to the increase the collar thickness, led to 30% increase in the maximum depth of the scour hole upstream of the pier. Also, with the increase in the thickness of the collar, the tendency of the streamlines upstream of the pier to the inner bank increased, resulting in a 20% increase in the maximum sedimentation near the inner bank. The maximum turbulent kinetic energy at 80 degrees of the bend, corresponds with a protected pier with 3 mm thickness, equal to 620 cm 2 /s 2 .gr, which is reduced by 60% with increasing collar thickness.

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Scour depth at inclined bridge piers along a straight path: A laboratory study

Cited by 20 publications

References 9 publications

Local Scour for Vertical Piles in Steady Currents: Review of Mechanisms, Influencing Factors and Empirical Equations

Local Scour for Vertical Piles in Steady Currents: Review of Mechanisms, Influencing Factors and Empirical Equations

Experimental and Numerical Comparison of Flow and scour Patterns around a Single and Triple Bridge Piers Located at a sharp 180 degrees Bend

Experimental Investigation on the Effect of Increasing the Collar Thickness on the Flow Pattern around the Oblong Pier in 180˚ Sharp Bend with Balanced Bed

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