Evaluation of Flow-Altering Countermeasures against Bridge Pier Scour

Tafarojnoruz, Ali; Gaudio, Roberto; Calomino, Francesco

doi:10.1061/(asce)hy.1943-7900.0000512

Cited by 102 publications

(68 citation statements)

References 21 publications

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“…Results of Tafarojnoruz [26] also show that some kinds of pier scour countermeasures, e.g., pier slot, may not significantly change the similarity of the scour shape.…”

Section: The Profile Morphology Of the Scour Holesmentioning

confidence: 96%

Geometric Characteristics of Spur Dike Scour under Clear-Water Scour Conditions

Zhang

Wang

Yang

et al. 2018

Water

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Factors such as flow and sediment characteristics affecting the spur dike's local depth of erosion have yielded considerable research results, but there is little discussion of the geometry of the spur dike's local scour holes. This study focuses on the spatial characteristics of the geometry of local scour holes in straight-wall spur dikes. The discussion shows that the spur dike arrangement clearly changes the plane geometry of the scour hole. The maximum scour depth has a power function relationship with the area of the scour hole and the scour hole-volume. Moreover, the ratio of the product of the maximum scour depth and the plane area of the scour hole to the scour hole-volume is a fixed constant. The average slope of upstream of the scour hole and along the axis direction of the spur dike is slightly larger than the angle of repose of the sediment, the slope distribution of the scour holes profiles presents an inverted "U" type, and its profile morphology and slope distribution have geometric similarity. This distribution also reflected that, the interaction between the downward flow and the horseshoe vortex inside the scour hole leads to the formation of a cusp.

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“…Results of Tafarojnoruz [26] also show that some kinds of pier scour countermeasures, e.g., pier slot, may not significantly change the similarity of the scour shape.…”

Section: The Profile Morphology Of the Scour Holesmentioning

confidence: 96%

Geometric Characteristics of Spur Dike Scour under Clear-Water Scour Conditions

Zhang

Wang

Yang

et al. 2018

Water

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“…The Buckingham theorem applied to Eq. (1), with ρ, U , and b as basic variables, leads to the following dimensionless relationship (Tafarojnoruz et al 2012):…”

Section: Dimensional Analysismentioning

confidence: 99%

“…In the presence of a countermeasure, the maximum scour depth occurs at the pier front (e.g. Grimaldi et al 2009b, Tafarojnoruz et al 2012. Therefore, the efficiency of the countermeasure r de is defined in terms of the reduction of the equilibrium maximum scour depth observed in proximity to the pier as…”

Section: Efficiency Of Countermeasuresmentioning

confidence: 99%

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Combined flow-altering countermeasures against bridge pier scour

Gaudio

Tafarojnoruz

Calomino

2012

Journal of Hydraulic Research

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This study presents the results of clear-water tests on the following five combined flow-altering countermeasures against bridge pier scour: (1) submerged vanes and a bed sill, (2) slot and sacrificial piles, (3) a collar and sacrificial piles, (4) a slot and a collar, and (5) a bed sill and a collar. Each countermeasure was designed on the basis of the best configuration recommended in the literature. The results clarify that an improper combination of two countermeasures may be less effective than each individual countermeasure; combinations (1), (2), and (3) do not reduce the scour depth significantly with respect to the single countermeasures; combination (3) increases the scour rate during the first few hours with respect to a single collar; combination (4) may also prevent scour intrusion beneath a collar; and combination (5) in the best configuration reduces the scour depth significantly around the collar with respect to maximum scour depth of the unprotected pier, preventing also the scour hole reaching the pier body.

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“…[32] tested slots of different heights from the initial bed level to the water surface and found that over 60% of the scour depth would be mitigated with a height of 0.33D to 0.77D. Recently, Tafarojnoruz et al [33] evaluated six types of flow-altering countermeasures (submerged vanes, bed sill, transverse sacrificial piles, collar, threading and pier slot) under steady currents with the velocity slightly lower than that of the threshold condition.…”

Section: Introductionmentioning

confidence: 99%

An experimental study on pile scour mitigating measures under waves and currents

Liang

Zhang

Yang

2015

Sci. China Technol. Sci.

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An experimental study has been carried out to investigate effects of four flow-altering scour countermeasures placed around a foundation pile under currents only as well as under coexisting waves and currents. The countermeasures are sacrificial piles, downstream bed sill, sleeve and slot in the pile. Their arrangements follow the suggested optimal configurations, with some of them slightly modified. In terms of the evolution of scour depth and bed topography around the pile, the scour countermeasures are evaluated, subjected to steady currents with or without irregular waves. A comparison between maximum scour depth with the countermeasures and one without the countermeasures demonstrates the efficiency of countermeasures. All the tested scour measures reduce the scour depth by 17.6%-42.6% under the action of currents only and 5.8%-24.0% under the combined action of both currents and waves. The results also show that it takes a shorter time for the scour depth to reach its equilibrium with the measures under either coexisting currents and waves or currents only than ones without the measures.

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Evaluation of Flow-Altering Countermeasures against Bridge Pier Scour

Cited by 102 publications

References 21 publications

Geometric Characteristics of Spur Dike Scour under Clear-Water Scour Conditions

Geometric Characteristics of Spur Dike Scour under Clear-Water Scour Conditions

Combined flow-altering countermeasures against bridge pier scour

An experimental study on pile scour mitigating measures under waves and currents

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