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

  • Elham Zarei
  • Mohammad VaghefiEmail author
  • Seyyed Shaker Hashemi
Original Paper
  • 44 Downloads

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.

Keywords

180° bend Bed topography changes Bridge pier Submerged vane angles Submerged vane lengths Submerged vane numbers 

Notation The following symbols are used in this paper:

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

uc

critical shear velocity

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Copyright information

© Saudi Society for Geosciences 2019

Authors and Affiliations

  • Elham Zarei
    • 1
  • Mohammad Vaghefi
    • 1
    Email author
  • Seyyed Shaker Hashemi
    • 1
  1. 1.Department of Civil EngineeringPersian Gulf UniversityBushehrIran

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