Scour and three-dimensional flow field measurement around short vertical-wall abutment protected by collar

Karami, Hojat; Hosseinjanzadeh, Hossein; Hosseini, Khosrow; Ardeshir, Abdollah

doi:10.1007/s12205-017-0521-1

Cited by 16 publications

(13 citation statements)

References 16 publications

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“…The protective effect is increased with the increase of the collar external diameter for all twelve measuring points. The scour development related to the increase of collar external diameter has also been reported in the previous studies [33][34][35].…”

Section: Effect Of Collar External Diametersupporting

confidence: 80%

“…Gaudio et al [32] carried out clear-water tests on the bridge pier scour with various combinations of collars with some other countermeasures and concluded that an improper combination of two countermeasures may be less effective than each individual countermeasure. Similar studies about collars in reducing the scour depth can be found in several studies [25,27,29,[33][34][35]. However, these studies seldom focused on the distribution of the scour depth around piers and how to design the anti-scour collar and optimize its protective effect on the local scour of piers.…”

Section: Introductionmentioning

confidence: 61%

“…Considering downward flow in front of the pier is one of the reasons that causes local scour of sediment. In the existing literature, there are many studies on the installation height and external diameter of anti-scour collars [24,25,27,[29][30][31][32][33], but there are few studies focused on the protection range of anti-scour collars. It is interesting to determine if we can protect the sediment by reducing the protective range of the collar.…”

Section: Effect Of Collar Protection Rangementioning

confidence: 99%

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Experimental Investigation of Local Scour Protection for Cylindrical Bridge Piers Using Anti-Scour Collars

Wang

Wei

Shen

et al. 2019

Water

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Local scour of bridge piers is one of the main threats responsible for bridge damage. Adopting scour countermeasures to protect bridge foundations from scour has become an important issue for the design and maintenance of bridges located in erodible sediment beds. This paper focuses on the protective effect of one active countermeasure named an “anti-scour collar” on local scour around the commonly used cylindrical bridge pier. A cylindrical pier model was set up in a current flume. River sand with a median particle size of 0.324 mm was selected and used as the sediment in the basin. A live-bed scour experimental program was carried out to study the protective effect of an anti-scour collar by comparing the local scour at a cylindrical bridge pier model with and without collar. The effects of three design parameters including collar installation height, collar external diameter and collar protection range, on the scour depth and scour development were investigated parametrically. According to the experimental results, it can be concluded that: the application of an anti-scour collar alleviates the local scour at the pier effectively; and the protection effect decreases with an increase in the collar installation height, but increases with an increase in the collar external diameter and the protection range. Design suggestions for improving the scour protective effect of the anti-scour collar are summarized and of great practical guiding significance to the development of anti-scour collars for bridge piers.

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Section: Effect Of Collar External Diametersupporting

confidence: 80%

Section: Introductionmentioning

confidence: 61%

Section: Effect Of Collar Protection Rangementioning

confidence: 99%

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Experimental Investigation of Local Scour Protection for Cylindrical Bridge Piers Using Anti-Scour Collars

Wang

Wei

Shen

et al. 2019

Water

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“…The scour process becomes complex due to formation of an intricate vortex system around pier. This formation of vortex system comprises of wake vortex, horseshoe vortex, bow wave vortex, and trailing vortex [1,2]. Over the recent years, significant research has been undertaken to analyze the influence of various factor on the development of the complex intricate vortex system at the bridge piers.…”

Section: Introductionmentioning

confidence: 99%

“…Various flow altering measures are proposed in the literature for the protection of bridge piers against scouring such as vane plates, openings, cables and collars [16][17][18][19][20]. Collars of varying thickness and shapes are utilized by various researchers fitted around the piers as shielding plates against removal of sediments [2,4,21,22]. According to Alabi [23], a collar having thickness equal to or less than 5 mm has no adverse effect on scour development.…”

Section: Introductionmentioning

confidence: 99%

Optimal Octagonal Hooked Collar Countermeasure to Reduce Scour Around a Single Bridge Pier

Farooq¹,

Ghumman²,

Tariq³

et al. 2020

Period. Polytech. Civil Eng.

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Pier modification countermeasures are essential as they play a vital role in protecting pier against local scour action. Current study investigates experimentally the scour around vertical pier of octagonal cross section with pier modification such as newly proposed octagonal hooked collar is explored, in steady uniform state, under clear water condition. The results of pier scour without any modification were used as a reference to compute the efficiency of hooked collar provision around octagonal pier. The results show that by increasing the hooked collar width up to 2.5 Wp reduced maximum scour depth significantly. However, the experimental investigation revealed that the best combination to be with a hooked collar width of 2.5 Wp, having sidewall height 0.45 Wp. The best combination minimized around 73.3 % of scour hole depth, compared to octagonal pier without any modification. Using experimental results, a new equation is proposed to predict the scour depth around a bridge pier fitted with hooked collar. Moreover, a relation was developed for maximum scour depth and scour hole volume. Results indicate that the scour hole volume around a bridge pier increases quadratically with maximum scour depth.

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Flow dynamics in the vicinity of a gravel embedded vertical retaining wall: conditions corresponding to the initial stages of local erosion

Heydari

Diplas

2019

Environ Fluid Mech

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Scour and three-dimensional flow field measurement around short vertical-wall abutment protected by collar

Cited by 16 publications

References 16 publications

Experimental Investigation of Local Scour Protection for Cylindrical Bridge Piers Using Anti-Scour Collars

Experimental Investigation of Local Scour Protection for Cylindrical Bridge Piers Using Anti-Scour Collars

Optimal Octagonal Hooked Collar Countermeasure to Reduce Scour Around a Single Bridge Pier

Flow dynamics in the vicinity of a gravel embedded vertical retaining wall: conditions corresponding to the initial stages of local erosion

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