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Investigation of the Effects of the Arrangement of Triplex Inclined-Vertical Group Piers in a Sharp Bend on the Characteristics of Scour Holes

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Abstract

This study aims to investigate the bed change and scouring characteristics in a sharp 180-degree bend due to the establishment of triple vertical-inclined piers with various arrangements. Experiments were conducted in conditions of motion threshold and uniform sediment size. The results show that the maximum scour depth due to the establishment of a convergent-vertical group pier is equivalent to 104% of the flow depth. On the other hand, a divergent-vertical group pier, which has the lowest value of this parameter, results in about 80% of flow depth. The maximum height of sedimentation with the establishment of group pier divergent-vertical on the normal plane to the stream is created when this value reaches 63% of flow depth at the end of the straight portion of the channel. The maximum and minimum hole volume due to the establishment of grouped divergent-vertical piers oriented in the normal plane to the stream and convergent-vertical group piers is calculated in a streamwise condition.

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Data and Material Availability

All data generated or analyzed during this study are included in this published article.

Abbreviations

y :

Water depth

d 50 :

Average sediment particle diameter

ρ :

Water density

ρ s :

Sediment density (\({\rho }_{S})\)

g :

Gravity acceleration

U c :

Stream velocity at the motion threshold

\({\sigma }_{g}= \sqrt{{D}_{84}/{D}_{16}}\) :

Geometric standard deviation of particles

B :

Channel width

Z :

Distance to the channel bottom

U :

Tangential velocity component

Ɵ :

Angle from the beginning of the bend

X :

Component X in the Cartesian coordinate system

Y :

Component Y in the Cartesian coordinate system

d s :

Depth of scour

D :

Pier width

Q :

Discharge

CVT:

Convergent-vertical transverse

CVS:

Convergent-vertical streamwise

DVT:

Divergent-vertical transverse

DVS:

Divergent-vertical streamwise

d smax :

Maximum scour depth

y 0 :

Depth of water

h smax :

Maximum height of sediment

L :

Distance affected by variations of bend head

V s :

Volume of hole

SV:

Sigle-vertical pier

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The authors received no funding for this work.

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Authors and Affiliations

  1. Department of Civil Engineering, Persian Gulf University, Shahid Mahini St., Bushehr, 75169, Iran

    Leila Eghbalnik & Mohammad Vaghefi

  2. Department of Civil Engineering, The University of Memphis, Memphis, USA

    Abdol Mahdi Behroozi

Authors
  1. Leila Eghbalnik
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  2. Mohammad Vaghefi
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  3. Abdol Mahdi Behroozi
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The authors declare that they have contribution in the preparation of this manuscript. All authors read and approved the final manuscript.

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Correspondence to Mohammad Vaghefi.

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Eghbalnik, L., Vaghefi, M. & Behroozi, A.M. Investigation of the Effects of the Arrangement of Triplex Inclined-Vertical Group Piers in a Sharp Bend on the Characteristics of Scour Holes. Iran J Sci Technol Trans Civ Eng 47, 3989–3997 (2023). https://doi.org/10.1007/s40996-023-01165-z

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