Experimental investigation of the angle effect of the cylindrical bridge group piers relative to the flow direction on the maximum scour depth of the piers

Document Type : Research Paper


1 Graduated Student of Water Engineering and Environment Faculty, Shahid Chamran Univeristy of Ahvaz,Ahvaz, Iran.

2 Professor of Water Engineering and Environment Faculty, Shahid Chamran Univeristy of Ahvaz,Ahvaz, Iran.


Bridges are one of the important structures in the field of land communication. With the construction of these structures in the river, a flow pattern with a three-dimensional structure is formed in the vicinity of its piers, and as a result of increasing the flow speed and the formation of horseshoe vortex and wake vortices, part of the sediments around the piers and foundation will be washed away, and if the sufficient depth of foundation is not taken into account, the destruction of the bridge will result especially during floods. Road or railway crossing over the rivers is limited to the particular reach of the rivers which is determined by the general direction of the road or railway. Moreover, the general direction of the road or railway determines the position of the bridge over the river. Selection of the bridge path angle relative to the river flow direction is very important.  Sometimes, due to the geographical conditions of the region and the general direction of the road or railway, the bridge crossing directly perpendicular to the flow direction is impossible. In this case, the bridge deck diagonally crosses over the river and the bridge group piers are angled relative to the flow direction. In such case, the distance between the piers, the flow direction relative to the piers and the piers submergence are very important parameters which affect the scour depth.


Main Subjects

  • Azhari, A., Taghipour, R,. and Alizadeh, M, Local scouring around the foundation group of the bridge: investigation of the effect of the arch angle of the channel and the distance between the foundations. The 11th Iranian Hydraulic Conference, Urmia University. (In Persian).


  • Beheshti, E,. Ataei Ashtiani, B,. 2004. Scouring in clear water conditions around the base group. Second National Congress of Civil Engineering, Sharif University of Technology, Tehran.


  • Chiew, Y.M. and Melville, B.W., 1987. Local scour around bridge piers. Journal of Hydraulic Research25(1), pp.15-26.


  • Hannah, C.R. 1978. Scour at pile groups. Research Rep. No. 78-3, Civil Engineering, Univ. of Canterbury, New Zealand.


  • Heidarpour, M., Afzali Mehr, H. and Khoda Rahmi, Z, 2007. Local scour protection of circular bridge pier groups using slot, Journal of Agricultural Sciences and Natural Resources, 14(3), pp174-185. (In Persian).


  • Lança, R., Fael, C., Maia, R., Pêgo, J.P. and Cardoso, A.H., 2013. Clear-water scour at submerged pile groups.1061/(ASCE)HY.1943-7900.0000770, 1089-1098.


  • Melville, B.W. and Chiew, Y.M., 1999. Time scale for local scour at bridge piers. Journal of Hydraulic Engineering125(1), pp.59-65.


  • Mousavi Jahromi, H., and Taghizadeh, K. 2006. The influence of the shape and number of bridge piers on erosion. Seventh International Seminar on River Engineering, Ahvaz, Shahid Chamran University. (In Persian).


  • Movahedi, N., Dehghani, A.A., Zahiri, A.R. and Aarabi, M.J., 2015. Investigation the efficiency of using bed sill in reduction of scour around single pier and side-by-side piers. Journal of Water and Soil Conservation21(6), pp.191-205. (In Persian).


  • Nazariha, M. 1996. Design relationships for maximum local scour depth for bridge pier groups. PhD Dissertation, University of Ottawa.


  • Nourzad, H,. Heidarpour, M,. and Afzali Mehr, R. 2001. Controlling the local scouring of the bridge foundation by using gaps in the foundation group. Proceedings of the 2nd Iranian Hydraulic Conference, Technical Faculty of Tehran University. (In Persian).


  • Sheppard D. M. and Renna R. 2005. Bridge scour manual. florida department of transportation. 605 Suwannee Street. Tallahassee. Florida. 129 pp.


  • Zhao, G. Sheppard, D. M. 1999.The effect of flow skew angle on sediment scour near pile groups. Stream Stability and Scour at Highway Bridges; Compilation of Conference Papers, Reston (U.S.): ASCE.
Volume 45, Issue 3
December 2022
Pages 131-145
  • Receive Date: 08 September 2020
  • Revise Date: 07 March 2022
  • Accept Date: 09 March 2022
  • Publish Date: 23 October 2022