Clear-Water Local Scour around Pile Groups in Shallow-Water Flow

Amini, Ata; Melville, Bruce W.; Ali, Thamer M.; Ghazali, Abdul Halim

doi:10.1061/(asce)hy.1943-7900.0000488

Cited by 126 publications

(42 citation statements)

References 8 publications

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“…For instance, Briaud et al [8] reported that until 1999, approximately 60% of bridge failures in the United States was because of the local scouring around the piles and Hunt [9] documented more than 1502 bridge failure occurred from 1996 to 2005 in the United States. Numerous studies on local scour around circular pile groups have been conducted by laboratory experiments [10][11][12][13]. The objective of those works was an estimation of maximum scour depth around pile groups for safe and economic designs.…”

Section: Introductionmentioning

confidence: 99%

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Computational Modeling of Flow and Scour around Two Cylinders in Staggered Array

Kim

Roh

Nabi

2017

Water

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This paper presents a numerical study on flow and local scour around two identical cylinders with diverse spacing ratios (s/D) and alignment angles (α). The spacing ratio of center-to-center distance between cylinders (s) to the cylinder diameter (D) varied from 1.25 to 5.0, including five alignment angles ranged from 0 • to 90 • . The detailed scour processes and information were obtained in a physics-based way by using large eddy simulation coupled with sediment transport in a Lagrangian framework and a morphodynamic model. Turbulent flow properties around two cylinders in staggered array are significantly concerned by the spacing ratio and the alignment angle which reflect complex features of evolution of scour and scour depth. The computed results exhibited the scour depth is associated with the spacing ratio and alignment angles especially at the rear cylinder. For small alignment angles, the growth rate at the rear cylinder increased as the spacing ratio increased, due to a decrease in shielding effect. As the alignment angle increased, the scour depth around the rear cylinder increased until the angle reached approximately 45 • -60 • . Subsequently, the scour depth decreased with the alignment angle. It also revealed that the spacing ratio was more sensitive to the maximum scour than that of the alignment angle. For (s-D)/D > 2.0, the maximum scour depth only depended on the spacing ratio.

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Section: Introductionmentioning

confidence: 99%

“…In addition to the estimation of scour depth, some studies deal with proposing scour countermeasures at pier groups [14,15]. Thus, some semi-empirical equations for maximum scour depth have been proposed [10,11,13]. However, most of these equations overestimated the maximum scour depth due to the scaling effect [16,17].…”

Section: Introductionmentioning

confidence: 99%

Computational Modeling of Flow and Scour around Two Cylinders in Staggered Array

Kim

Roh

Nabi

2017

Water

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“…A correction factor K Gmn was proposed to include the effects of the numbers of piles parallel and perpendicular to the flow direction, in the already devised Richardson and Davis, (2001) empirical formula. The formula is shown below: Amini et al (2011) conducted an experimental study on clear-water local scour at pile groups under steady flow. They investigated a wide range of pile arrangements, spacing's and submergence ratios.…”

Section: /2mentioning

confidence: 99%

“…Ghaemi et al 2013). Current-induced pile scour has received a range of attention in past literature including (Breusers et al 1977;Hannah 1978;Breusers andRaudkivi 1991, Melville 1997;Salim and Jones 1998;Melville and Chiew 1999;Melville and Coleman 2000;Richardson and Davis 2001;Ataie-Ashtiani and Beheshti 2006;Amini et al 2011;Ghaemi et al 2013). At present, there is still a limited amount of research into current induced scour around non-uniformly spaced pile groups.…”

Section: Introductionmentioning

confidence: 99%

Predicting scour depth around non-uniformly spaced pile groups

Howard¹,

Etemad‐Shahidi²

2014

Hydraulic Structures and Society - Engineering Challenges and Extremes

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“…Accordingly, scour around pile groups may be caused by two mechanisms: 1) local scour in individual piles and, 2) global scour (general lowering of the bed) over the entire area of the pile group. Amini et al [8] evaluated the commonly used equations to estimate the local scour depth in a group of piles for different spacing, arrangements, and submergences.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Harmony Search Optimization to Predict Local Scour Depth around Complex Bridge Piers

2018

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One of the main causes of bridge collapse may be flood flow scour near piers. Several experimental and local field investigations were carried out to study scour depth. However, existing empirical equations do not commonly provide accurate scour prediction due to the complexity of the scour process. Physical and economic considerations often lead to bridge foundation constructs which included a pier column based on a pile cap supported by an array of piles. Piers with this configuration are referred to as complex piers. A few studies have been done on complex bridge pier scour depth estimation. Such efforts may be classified into theoretical and empirical equations. This paper investigates local scour around complex bridge piers by using harmony search algorithm under clear water conditions. Statistical indices such as the coefficient of determination (R2), root mean square error (RMSE), mean absolute error (MAE), mean absolute percentage error (MAPE), and bias were used to evaluate the performance of these methods. By designing laboratory tests, 82 experimental data points were measured by authors. Also 615 experimental data sets with the same measured experimental conditions were collected from published literature and used for optimization. The results show that the developed HS model can predict scour depth better than other equations according to statistical indices.

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Clear-Water Local Scour around Pile Groups in Shallow-Water Flow

Cited by 126 publications

References 8 publications

Computational Modeling of Flow and Scour around Two Cylinders in Staggered Array

Computational Modeling of Flow and Scour around Two Cylinders in Staggered Array

Predicting scour depth around non-uniformly spaced pile groups

Evaluation of Harmony Search Optimization to Predict Local Scour Depth around Complex Bridge Piers

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