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Effect of Collars on the Downstream Movement of the Maximum Scour Depth Location Around Bridge Abutments and Piers

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Abstract

A detailed investigation has been conducted to study the shift location of the point of the maximum scour depth for both bridge abutment-collar and pier-collar arrangements. In the present study, an experimental program has been conducted for abutment-collar arrangements and additionally, the data obtained from the literature for the pier-collar arrangements have been revisited and analyzed to complement the framework of this study. For the abutment-collar arrangements, a series of experiments under clear-water conditions were carried out for different abutment lengths with fixed values of collar location and collar width. For pier-collar arrangements, data used from the literature have been involved constant pier diameter with various collar sizes at various elevations. To describe the locations of these maximum scour depths, their coordinates with respect to the location of the abutment or the pier were obtained. Results from this investigation showed that when a collar placed on or below the bed level was used as a countermeasure against scouring, either on an abutment or on a pier, it was observed that the maximum scour depth was routed downstream of the bridge structure.

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Data Availability

The data that support the findings of this study are available from the corresponding author upon reasonable request.

Abbreviations

B :

Width of the channel

B a :

Width of the abutment

B c :

Width of the collar

d 50 :

Median grain size of the sediment

d 84 :

Sediment sizes for which 84% of the sediments are finer

d 16 :

Sediment sizes for which 16% of the sediments are finer

Fr :

Froude number

g :

Gravitational acceleration

L :

Shift distance of the maximum scour depth location around bridge abutment or pier with a collar

L a :

The length of the abutment perpendicular to the flow direction

Re :

Reynolds number

S :

Slope of the channel

t :

Time of scour

T c :

Thickness of the collar

U :

Mean velocity of the approach flow

U c :

Critical velocity for initiation of sediment particle motion

x :

Coordinate system axis

y :

Depth of the approach flow

Z c :

Elevation of the collar with respect to the bed level

Ź:

Coordinate system axis

\(\sigma\) g :

Geometric standard deviation of sediment size distribution, (d84,d16)0.5

θ :

Angle of maximum scour depth deviation (in degree)

\(\rho\) s :

Density of the sediment

\(\rho\) :

Density of the fluid

µ :

Dynamic viscosity of the fluid

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Authors and Affiliations

  1. Civil Engineering Department, Necmettin Erbakan University, Hydraulic Division, Konya, Turkey

    Serife Yurdagul Kumcu

  2. Civil Engineering Department, TED University, Ankara, Turkey

    Mehmet Ali Kokpinar

  3. Civil Engineering Department, Çankaya University, Ankara, Turkey

    Mustafa Gogus

Authors
  1. Serife Yurdagul Kumcu
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  2. Mehmet Ali Kokpinar
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  3. Mustafa Gogus
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Corresponding author

Correspondence to Mehmet Ali Kokpinar.

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Kumcu, S.Y., Kokpinar, M.A. & Gogus, M. Effect of Collars on the Downstream Movement of the Maximum Scour Depth Location Around Bridge Abutments and Piers. Iran J Sci Technol Trans Civ Eng 46, 1421–1432 (2022). https://doi.org/10.1007/s40996-021-00654-3

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  • DOI: https://doi.org/10.1007/s40996-021-00654-3

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