Control of Scour at Bridge Piers by a Downstream Bed Sill

Grimaldi, Carmelo; Gaudio, Roberto; Calomino, Francesco; Cardoso, António H.

doi:10.1061/(asce)0733-9429(2009)135:1(13)

Cited by 52 publications

(38 citation statements)

References 12 publications

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“…The scour depth reduction at the end of the test was only 8% higher than that observed for a single bed sill (Table 1). Figure 3 also shows that, although the maximum scour depth was located inside the vanes, two additional scour holes occurred downstream and relatively far away from the pier and the bed sill, for which the lower parts of the wake vortices were responsible (Grimaldi et al 2009a). …”

Section: Combination Of Submerged Vanes and A Bed Sillmentioning

confidence: 96%

“…These countermeasures were individually evaluated by Tafarojnoruz et al (2012) in configurations recommended, respectively, by Ghorbani and Kells (2008) and Grimaldi et al (2009a) as pier scour countermeasures, indicating that the efficiency of single countermeasures is below 20% (Table 1). In Test A1, a combination of the two countermeasures in the best of each configuration was considered (Table 1).…”

Section: Combination Of Submerged Vanes and A Bed Sillmentioning

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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Section: Combination Of Submerged Vanes and A Bed Sillmentioning

confidence: 96%

Section: Combination Of Submerged Vanes and A Bed Sillmentioning

confidence: 99%

Combined flow-altering countermeasures against bridge pier scour

Gaudio

Tafarojnoruz

Calomino

2012

Journal of Hydraulic Research

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“…Considering the fact that a bed sill across the whole section of the channel would result in significant scouring near the side wall [28,38,39], a bed sill with a limited length (L bs ) of 2D, viz. L bs =0.32 m, and a thickness of 3 mm is tested in this study.…”

Section: Downstream Bed Sillmentioning

confidence: 99%

“…Haque et al [27] studied the effect of three side-by-side piles located upstream of a rectangle pier in currents and found that up to half of the scour depth could be reduced. Grimaldi et al [28] used a downstream bed sill to control the scour under current actions. The scour depth could be reduced by 26% and the bed sill placed 0.5D downstream of the pile (D=pile diameter) would reduce over 80% of scour area and volume.…”

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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“…Several approaches and design criteria have been suggested to reduce the scour at bridge piers, including different countermeasures such as collars (Ettema, 1980;Tanaka and Yano, 1967;Thomas, 1967), bed-sills (Grimaldi et al, 2009a(Grimaldi et al, , 2009b, Iowa vanes (Ghorbani and Kells, 2008;Odgaard and Wang, 1987), collar-ripraps (Chiew, 1995;Zarrati et al, 2006) and slot-collars (Kumar et al, 1999;Moncada-M et al, 2009). In addition, several studies reported in the literature deal with bridge pier scour in the presence of debris accumulation (Diehl, 1997;Lagasse et al, 2009;Melville and Dongol, 1992;Carnacina, 2010, 2011).…”

Section: Introductionmentioning

confidence: 99%

Scour control at bridge piers using macro-roughness elements

Pagliara¹,

Palermo²,

Azizi³

2015

Proceedings of the Institution of Civil Engineers - Water Manag

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A new approach involving macro-roughness elements is proposed as a scour countermeasure at circular bridge piers subject to debris accumulation. Experiments were carried out under clear water conditions with the approaching flow velocity set at the threshold of sediment motion. The efficiency of the method was investigated in terms of scour morphology reduction and temporal scour evolution. The results show the effectiveness of the method in reducing maximum scour depth. In some cases, the elements did not reduce the maximum scour depth but were effective in reducing the volume of the scour hole. Based on the experimental data, empirical equations were derived to estimate the temporal local scour depth in the presence of debris accumulation and macro-roughness elements

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Control of Scour at Bridge Piers by a Downstream Bed Sill

Cited by 52 publications

References 12 publications

Combined flow-altering countermeasures against bridge pier scour

Combined flow-altering countermeasures against bridge pier scour

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

Scour control at bridge piers using macro-roughness elements

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