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


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.


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:


channel width


bridge pier diameter


Surrounded rectangle length on scour hole


Surrounded rectangle width on the scour hole


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


amount of progress of scouring hole around bridge pier toward downstream


slope amount of the scour hole around bridge pier toward downstream


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


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


slope amount of the scour hole around bridge pier toward upstream


shear velocity


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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