Local scour at complex bridge piers – experimental validation of current prediction methods

Sousa, Ana Margarida; Ribeiro, Tiago

doi:10.1080/09715010.2019.1639223

Cited by 4 publications

(4 citation statements)

References 13 publications

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“…The numerical modeling was carried out with the Saint-Venant equations for the characterization of the flow, solved with the Telemac-2D module of the Telemac-Mascaret modeling system [18]. The Saint-Venant equations are expressed by Equations ( 1)- (3).…”

Section: Numerical Modelmentioning

confidence: 99%

“…The phenomenon of scour in river beds is a complex problem of fluvial hydraulics, and it occurs not only in the neighborhood of structures and waterworks but also in river bends or meanders [2]. The estimation of the magnitude of scour is important from an engineering perspective because an underestimation can lead to structural failures of hydraulic works, and an overestimation has an adverse effect on costs [2,3]. In many cases, the derivation of equations for the calculation of bed-load transport was performed from data obtained in laboratory straight channels [4], and most of them are limited in the representation of more complex phenomena, such as secondary flows, transversal bed slopes, separation zones, turbulence effects, etc.…”

Section: Introductionmentioning

confidence: 99%

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Numerical–Experimental Study of Scour in the Discharge of a Channel: Case of the Carrizal River Hydraulic Control Structure, Tabasco, Mexico

Caballero,

Mendoza,

Berezowsky

et al. 2023

Water

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Scour processes occur, among other causes, by the interaction of flow and sediment transport around structures built within a river. It is important to identify the location and quantify the magnitude of scour to avoid under or overestimation since the former puts the structure at risk and the latter demands an excessive economic cost. The data obtained from a physical model with a scale of 1:60 (without distortion) was used to assess the accuracy of a 2D free-surface numerical model (2DH) in predicting maximum scour. The physical model corresponds to the hydraulic-regulating structure located at the entrance of the Carrizal River, tributary to the Mezcalapa River bifurcation, located in Tabasco, Mexico. The scour is produced by the effect of a jet generated by a discharge channel. The maximum experimental scour was compared to the results of a numerical model and the estimation of four empirical equations: Breusers, Farhoudi and Smith, Negm, and Dietz. Setting an acceptance threshold of 75% accuracy, only the Breusers method provided values close to the measured values, and the numerical model failed to reproduce the location and magnitude of maximum scour, yet when the 2DH model was calibrated for secondary flow effects in the hydraulics. This indicates that the application of 2D models for the estimation of scour caused by jets may not provide good results when secondary currents are developed.

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Section: Numerical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical–Experimental Study of Scour in the Discharge of a Channel: Case of the Carrizal River Hydraulic Control Structure, Tabasco, Mexico

Caballero,

Mendoza,

Berezowsky

et al. 2023

Water

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“…Sousa and Ribeiro [28] studied the flow field around a pile supported pier positioned on a rough fixed bed with all components exposed to the approaching flow. They found that (1) the approaching boundary layer upstream the pile cap is separated into two vertical opposite directions, inducing an upward flow towards the column and a contracted downward flow below the pile cap and towards the piles; (2) the upward flow on the pile cap interacts with the down-flow in front of the column and deflects it towards the side of the pier; and (3) the flow at the rear of the pile cap is very complex, as the flow is simultaneously expanded to different directions.…”

Section: Introductionmentioning

confidence: 99%

Influence of Pile-Cap Elevation and Skewness on Clear Water Scour at Complex Bridge Piers

Hussein¹,

Shukur²,

Majeed³

2023

MMEP

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In this paper, laboratory tests were used to determine the effects of skewness and pilecap elevation on the local scour of complex bridge piers. The 1:50 scale river models represent the Beta complex bridge piers in Babylon Province and the Ali Al-Gharbi complex bridge piers in Missan Province. The model pier consists of circular columns, rectangular pile-cap, and 2×4 array of circular piles below for the Beta Bridge and 2×3 array of circular piles below for the Missan Bridge. Four different skew-angles (=0°, 30°, 45°, 60°) and pile-cap elevations corresponding to bed level are used. All experiments are conducted for twenty-four hours. Results suggest that locations of scour start, and maximum scour depth may be different, and that their relationship is dependent on pile-cap elevation and pier skew angle. Maximum equilibrium scour depth for aligned complex piers occurs when bottom of pile cap is above original bed level; for skewed complex piers, maximum equilibrium scour depth is much larger. Increase in depth of scouring is proportional to skew angle. Sensitivity of scour development to pier skew angle increases as pile-cap elevation increases, particularly when it is fully above original bed.

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“…A limited number of studies have been conducted for the computation of local scour depth [4,5], and a few have analyzed flow patterns around complex bridge pier structures [6][7][8][9][10][11], predominantly those with circular-shaped piers and pile-caps or rectangular piers with rounded ends [12]. Experiments have been conducted to investigate the threedimensional turbulent flow field around a rectangular complex bridge pier (with a rectangular pile-cap) installed on a fixed rough bed.…”

Section: Introductionmentioning

confidence: 99%

Clear Water Scour at Varied Pile-Cap Elevation and Skewed Bridge Piers

Hussein,

Shukur,

Majeed

2023

MMEP

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The effect of pile-cap elevation and skew angles on the local scour brought on by clearwater flow around complex bridge piers was investigated experimentally. The complex Selebat and suspension bridge piers in the Al-Muthana and Al-Basra Governorates, respectively, were replicated using two river models scaled at a ratio of one to fifty. Three different pile-cap altitudes and four different pier skew angles (0, 30, 45, and 60) were varied in the experiment. The results show that the equilibrium depth of scour (ds) is greatly increased by even a little skew angle added to previously aligned piers. Due to its wide-pier characteristic, the column contribution to the scour depth becomes predominate when a pier is located asymmetrically in relation to the flow. Three forms of pier skewness were distinguished: aligned piers (=0°), slightly skewed piers (=30°), and severely skewed piers (45°). The influence of pile-cap and pile group on the scouring action decreased as the skewness increased. Furthermore, equilibrium scour holes often reveal pier components uniformly, independent of the undisturbed bed level, particularly strongly skewed piers with entirely buried pile-caps. This study provides insightful information on the roles of pile-cap height and skew angles in flow-induced scouring, which may help designers and maintenance professionals develop more efficient design and preventative measures.

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Local scour at complex bridge piers – experimental validation of current prediction methods

Cited by 4 publications

References 13 publications

Numerical–Experimental Study of Scour in the Discharge of a Channel: Case of the Carrizal River Hydraulic Control Structure, Tabasco, Mexico

Numerical–Experimental Study of Scour in the Discharge of a Channel: Case of the Carrizal River Hydraulic Control Structure, Tabasco, Mexico

Influence of Pile-Cap Elevation and Skewness on Clear Water Scour at Complex Bridge Piers

Clear Water Scour at Varied Pile-Cap Elevation and Skewed Bridge Piers

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