Effect of pier shape and pier alignment on the equilibrium scour depth at single piers

Fael, Cristina; Lança, Rui; Cardoso, António H.

doi:10.1016/j.ijsrc.2016.04.001

Cited by 43 publications

(22 citation statements)

References 8 publications

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“…Some Researchers used shape factor to relate the scour around different type of piers. Shape factor 1.2 was reported by Cristina Fael [8] for square nosed bridge pier shape while shape factor 1.11 was suggested by Al-Shukur [11] in current study it was found to be 1.10-1.15 relative to scour around circular pier.…”

Section: Resultssupporting

confidence: 45%

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Effect of Bridge Pier Shape on Scour Depth at Uniform Single Bridge Pier

Murtaza

Hashmi

Naeem

et al. 2018

Mehran Univ. res. j. eng. technol.

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Bridge pier scouring may lead to the bridge failure and the shape of bridge pier itself is one of the main factor to control scouring around bridge pier. The amount of sediment which is removed from the boundary of bridge pier is called bridge pier scouring and the depth up to which sediment removed is called scour depth. Scouring results, the exposure of foundation, eventually leading to bridge failures. Assessment of the maximum scour that can be faced by pier has a vital role in the design of bridge foundation. Different techniques are used to minimize the scouring effect in order to control the bridge failure. In this study effect of bridge pier shape on scouring was checked on four different shape i.e. circular, oval, square and octagonal. Each pier shape was tested against three different values of flows i.e. 16, 22.50 and 29.50 liter/sec. Uniform bed material of standard deviation ( g = 1.21) and median size (D 50 = 0.28 mm) was used for all tests. Scour is measured with the help of point of gauge and bed is levelled before every experiment. Experimental results show that minimum scour is observed for octagonal bridge pier and maximum for square bridge pier while circular and oval faced intermediate scour depth relative to square and octagonal bridge pier. It is concluded that scour has reduced to 22% when octagonal pier was used compared to circular one.

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Section: Resultssupporting

confidence: 45%

“…Franzetti [7] did not agree with this concept. Critiana and Lanea [8] concluded that scour also depends upon shape and alignment of pier with flow direction.…”

Section: Introductionmentioning

confidence: 99%

Effect of Bridge Pier Shape on Scour Depth at Uniform Single Bridge Pier

Murtaza

Hashmi

Naeem

et al. 2018

Mehran Univ. res. j. eng. technol.

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“…A key factor widely acknowledged as increasing the scour risk of bridges is pier shape. Pier shape plays a vital role in the formation and the strength of the vortex system [7,[9][10][11][12][13]. The shape of the pier embedded vertically at the riverbed greatly changes the flow structures, and one can expect the large variations in the flow field due to different shapes of piers, and hence different scour forms.…”

Section: Introductionmentioning

confidence: 99%

Impact Assessment of Pier Shape and Modifications on Scouring around Bridge Pier

Farooq

Ghumman

2019

Water

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Previous experimental research on utilizing pier modifications as countermeasures against local scour has focused primarily on circular pier. It is of utmost importance to further investigate the most suitable pier shape for pier modification countermeasure separately and in combination. This experimental study aims to reduce the stagnation of the flow and vortex formation in front of the bridge pier by providing a collar, a hooked collar, a cable, and openings separately and in combination around a suitable pier shape. Therefore, six different pier shapes were utilized to find out the influence of pier shape on local scouring for a length-width ratio smaller than or equal to 3. A plain octagonal shape was shown as having more satisfactory results in reducing scour compared to other pier shapes. Furthermore, the efficiency of pier modification was then evaluated by testing different combinations of collar, hooked collar, cable, and openings within the octagonal bridge pier, which was compared to an unprotected octagonal pier without any modification. The results show that by applying such modifications, the scour depth reduced significantly. The best combination was found to be a hooked collar with cable and openings around an octagonal pier. It was revealed that the best combination reduced almost 53% of scour depth, as compared to an unprotected octagonal pier.

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“…Flood modeling involves multiple key aspects including: (i) hydrological model or flood wave characteristics [29], (ii) fluvial geomorphology issues [32][33][34], (iii) the influence of infrastructures such as bridges, dams, or buildings [22,35,36], (iv) structure of hydraulic model, its equations, methods to solve them, and simplifications applied to the model [11,23,37], (v) flow propagation methods [3,38], (vi) human-induced changes in land use [21], (vii) the roughness coefficient [11,31], (viii) vulnerability/damage curves of the potential effects of the flow [22,39,40], and (viii) topographic data of flood prone areas [3,33,[41][42][43].…”

Section: Introductionmentioning

confidence: 99%

Flood Hazard Assessment Supported by Reduced Cost Aerial Precision Photogrammetry

et al. 2018

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Increasing flood hazards worldwide due to the intensification of hydrological events and the development of adaptation-mitigation strategies are key challenges that society must address. To minimize flood damages, one of the crucial factors is the identification of flood prone areas through fluvial hydraulic modelling in which a detailed knowledge of the terrain plays an important role for reliable results. Recent studies have demonstrated the suitability of the Reduced Cost Aerial Precision Photogrammetry (RC-APP) technique for fluvial applications by accurate-detailed-reliable Digital Terrain Models (DTMs, up to: ≈100 point/m2; vertical-uncertainty: ±0.06 m). This work aims to provide an optimal relationship between point densities and vertical-uncertainties to generate more reliable fluvial hazard maps by fluvial-DTMs. This is performed through hydraulic models supported by geometric models that are obtained from a joint strategy based on Structure from Motion and Cloth Simulation Filtering algorithms. Furthermore, to evaluate vertical-DTM, uncertainty is proposed as an alternative approach based on the method of robust estimators. This offers an error dispersion value analogous to the concept of standard deviation of a Gaussian distribution without requiring normality tests. This paper reinforces the suitability of new geomatic solutions as a reliable-competitive source of accurate DTMs at the service of a flood hazard assessment.

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Effect of pier shape and pier alignment on the equilibrium scour depth at single piers

Cited by 43 publications

References 8 publications

Effect of Bridge Pier Shape on Scour Depth at Uniform Single Bridge Pier

Effect of Bridge Pier Shape on Scour Depth at Uniform Single Bridge Pier

Impact Assessment of Pier Shape and Modifications on Scouring around Bridge Pier

Flood Hazard Assessment Supported by Reduced Cost Aerial Precision Photogrammetry

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