Local Scour around Bridge Piers under Ice-Covered Conditions

Wu, Peng; Balachandar, Ram; Sui, Jueyi

doi:10.1061/(asce)hy.1943-7900.0001063

Cited by 32 publications

(16 citation statements)

References 18 publications

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“…Scour profile ( z / D , in which D is the pier diameter) at the flow direction ( x / D ) and transverse direction ( y / D ) at 90 and 48 hr (Cited from Wu, Balachandar, & Sui, )…”

Section: Methodsmentioning

confidence: 99%

Effects of splitter plate on reducing local scour around bridge pier

Balachandar

Ramamurthy

2018

River Research & Apps

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Local scour around bridge piers has been shown to be the most common reason for bridge failures. The use of splitter plates to modify the flow field around the pier has the potential to reduce the maximum scour depth. To test the effect of the splitter plate, the present study was conducted by using plates of various lengths (1 ≤ L/D ≤ 2). Here, D is the diameter of the pier, and L is the length of the splitter plate. The splitter plate was located both in the front and at the rear of the pier. The results show that for a constant splitter plate height, the plate with a length of 1.33D located in front of the pier has the greatest impact in reducing maximum scour. Results also showed that with increasing height of the splitter plate located in front of the pier, the maximum scour depth as well as the scoured area decreased correspondingly. In the range of test variables used in this study, the back splitter plate located with or without a gap between the pier and the plate showed limited impact on reducing the maximum scour around the pier. However, a significant change of dune height was observed in the back of the pier.

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“…Scour profile ( z / D , in which D is the pier diameter) at the flow direction ( x / D ) and transverse direction ( y / D ) at 90 and 48 hr (Cited from Wu, Balachandar, & Sui, )…”

Section: Methodsmentioning

confidence: 99%

Effects of splitter plate on reducing local scour around bridge pier

Balachandar

Ramamurthy

2018

River Research & Apps

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“…They found that the extent of scour is larger for ice-covered flows. Wu et al [28] studied the effect of relative bed coarseness, flow shallowness, and pier Froude number on local scour around a bridge pier and reported that the scour depth under covered conditions is larger than that under open-channel flow conditions.…”

Section: The Impact Of Ice Cover On the Maximum Scour Depth (Msd)mentioning

confidence: 99%

Experimental Study of Local Scour around Side-by-Side Bridge Piers under Ice-Covered Flow Conditions

Namaee¹,

Sui²,

Wu³

2020

Current Practice in Fluvial Geomorphology - Dynamics and Diversity

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A precise prediction of maximum scour depth (MSD) around piers under icecovered conditions is crucial for the safe design of the bridge foundation. Due to the lack of information for local scour under ice-covered flow condition, it is extremely hard to give proper estimation of MSD. In the current study, a set of flume experiments were completed to investigate local scour around four pairs of circular bridge piers with nonuniform bed materials under open channel, smooth and rough ice cover conditions. Three different bed materials with median particle size of 0.47, 0.50, and 0.58 mm were used to simulate natural river conditions. Regardless of pier size, the maximum scour depths were observed in front of the piers under all flow conditions. Additionally, a smaller pier size and a larger space between piers yield a smaller scour depth. Results showed that the maximum scour depth decreases with increase in the grain size of armor layer. The distribution of vertical velocity shows that the strength of downfall velocity is the greatest under rough ice cover. Empirical equations were developed to estimate the maximum scour depth around side-by-side bridge piers under both open-channel and ice-covered flow conditions.

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“…To the best of our knowledge, no studies on LB scour at piers in covered flow are available in the scientific literature. Analyses of CW scour in covered flow (considered prototypal of ice-covered rivers) were instead performed and results were compared to analogous ones for free-surface conditions, finding that scour depths in covered flows were slightly larger than those with a free surface (e.g., Hains & Zabilansky, 2004, Radice et al, 2009, and Wu et al, 2016. This is likely due to the fact that the upper boundary layer makes the flow concentrate closer to the sediment bed.…”

Section: Introductionmentioning

confidence: 99%