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Bed topography variations in bend by simultaneous installation of submerged vanes and single bridge pier

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Arabian Journal of Geosciences Aims and scope Submit manuscript

Abstract

Every year, thousands of bridges around the world are destroyed by scouring around their piers. One of the methods to control and protect the piers against scouring is to use submerged vanes. The purpose of this paper is to investigate the effect of upstream submerged vanes on scouring around the bridge pier and bed topography changes. For doing experiments, a cylindrical bridge pier and several numbers of submerged vanes with various angles and lengths were used in a laboratory flume with a 180° sharp bend. The results illustrate that by using three submerged vanes, sediments have progressed less toward the downstream. Moreover, the surrounded rectangle on scour hole around the bridge pier has the largest and smallest dimensions in test with four submerged vanes, length of 1.5 times the pier diameter and angle of 35° relative to the tangent at the bend mid-section, and in a test with two submerged vanes, length of equal to the pier diameter, and angle of 15°, respectively.

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Abbreviations

B:

channel width

D:

bridge pier diameter

HL :

Surrounded rectangle length on scour hole

HB :

Surrounded rectangle width on the scour hole

Li:

amount of progress of scouring hole around bridge pier toward inner bank

Ld:

amount of progress of scouring hole around bridge pier toward downstream

Md:

slope amount of the scour hole around bridge pier toward downstream

Mi:

slope amount of the scour hole around bridge pier toward inner bank

Mo:

slope amount of the scour hole around bridge pier toward outer bank

Mu:

slope amount of the scour hole around bridge pier toward upstream

u ∗ :

shear velocity

u ∗ c :

critical shear velocity

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Authors and Affiliations

  1. Department of Civil Engineering, Persian Gulf University, Bushehr, Iran

    Elham Zarei, Mohammad Vaghefi & Seyyed Shaker Hashemi

Authors
  1. Elham Zarei
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  2. Mohammad Vaghefi
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  3. Seyyed Shaker Hashemi
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Correspondence to Mohammad Vaghefi.

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Editorial handling: Domenico M. Doronzo

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Zarei, E., Vaghefi, M. & Hashemi, S.S. Bed topography variations in bend by simultaneous installation of submerged vanes and single bridge pier. Arab J Geosci 12, 178 (2019). https://doi.org/10.1007/s12517-019-4342-z

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  • DOI: https://doi.org/10.1007/s12517-019-4342-z

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