Application of SSIIM numerical model in simulation of local scouring around the aerodynamic bridge pier located in 90 ° bend

Document Type : Research Paper


1 Department of Civil Engineering, Islamshahr Branch, Islamic Azad University, Islamshahr, Iran.

2 Department of Civil Engineering, Rudehen Branch, Islamic Azad University, Rudehen, Iran.



Bridges are one of the most important and widely used river structures. Every year, a large number of them are destroyed by factors such as scouring and erosion. It is sometimes observed that the bridges are placed in the river bend, due to restrictions such as the road construction or river instability. On the other hand, studies have shown that the geometric shape of the bridge pier will have significant effect on the depletion of flow energy and thus reduce the scour depth around the bridge pier. Therefore, in this study, the effect of bend angle changes on flow pattern and local scouring around the of cylindrical bridge piers with aerodynamic shapes were investigated. SSIIM Three-dimensional software was used for modeling. The results showed that by increasing the bend angle and also placing the pier with a wide nose upstream, the amount of depth and volume of scouring increases, so that, the maximum depth and volume of scour occurred at a 90-degree angle to 0.1197123m and 0.08436892m3, respectively.


  1. Rozovskii I.L, (1957). Flow of water in bend of open channel, Academy of Sciences of the Ukrainian SSR, Institute of Hydrology and Hydraulic Engineering.
  2. Melville B W, Raudkivi A J, (1977). Flow Characteristics in Local Scour at Bridge Piers. Am.Soc. Civ. Eng., J.Hydr. Engrg, 15(4): 373-380.
  3. Gargic V, Bajestan M S, (2011). Investigating the scour depth around the bridge rationale in the 90-degree arc. Sixth National Congress on Civil Engineering (in Persian).
  4. Hajebi_F, Meftah M, (2013). Investigation of flow lines due to scour around the bridge pier using SSIIM numerical model. 9th International River Engineering Conference (in Persian). Shahid Chamran University, Ahvaz. Iran.
  5. Masjedi A R, Telvari A R, Kazemi H, (2013). Laboratory investigation of basic geometry of the bridge on scour ‎control around the river bend. Watershed Engineering and Management (in Persian), 4(4): 208-2166.
  6. Karimi O, (2013). Investigation of the effect of bridge base shape on depth and scour profile around it. 4th Conference on Water, Wastewater and Waste Management (in Persian), Tehran, Iran.
  7. Yahyavi S, Bakhshpuri Y, (2015). Evaluating the effect of the geometric shape of the bridge pier on the scouring around it. Shahid beheshti university. Tehran, Iran, (in Persian).
  8. Esmaeili T, Dehghani A A, Zahiri A, Suzuki K, (2009). 3D Numerical Simulation of Scouring Around Bridge Piers (Case Study: Bridge 524 crosses the Tanana River). World Academy of Science, Engineering and Technology, 58(10): 1028–1032.
  9. Elsaeed G H, (2011). Validating SSIIM 3-D Numerical Model to Calculate Local Scour around Bridge Piers. INTERNATIONAL JOURNAL of ACADEMIC RESEARCH, 3(3): 501–505.
  10. Akib SH, Basser H, Karami H, Jahangirzadeh A, (2016). Retrofitting of Bridge Piers against the Scour Damages: Case Study of the Marand-Soofian. International Journal of Computational Science and Engineering 8(1):56-60.
  11. Fael C, Lança R, Cardoso A, (2016). Effect of pier shape and pier alignment on the equilibrium scour depth at single piers. International Journal of Sediment Research, 31(3), 244–250.
  12. Moustafa A, Moussa A, (2018). Evaluation of local scour around bridge piers for various geometrical shapes using mathematical models. Ain Shams Engineering Journal, 9(4), 2571–2580
  13. Rasaei M, Nazari S, Eslamian S, (2020). Experimental investigation of local scouring around the bridge piers located at a 90° convergent river bend. Sadhana, 45(1), 87.
  14. M, Nazari S, Eslamian S, (2020). Experimental and numerical investigation the effect of pier position on local scouring around bridge pier at a 90° convergent bend. Journal of hydraulic structures, 6(1): 55-76.
  15. M, Nazari S, Eslamian S, (2020). Experimental and Numerical Investigation of Local Scouring around Bridge Piers in Different Geometric Shapes at a 90° Convergent meander. Journal of hydraulic structures, 6(2): 55-76.
  16. Olsen N R B, (2004). CFD Algorithms for Hydraulic and Sedimentation Engineering. The Norwegian University of Science and Technology.
  17. Ismael A, Gunal M, Hussein H, (2015). Effect of Bridge Pier Position on Scour Reduction According to Flow Direction. Arabian Journal for Science and Engineering, 40(6): 1579–1590.