Document Type : Research Paper


1 MSc, Department of Civil Engineering, Faculty of Civil Engineering, University of Science and Technology, Tehran, Iran

2 PhD Scholar, Department of Civil Engineering, Faculty of Civil Engineering, University of Semnan, Semnan, Iran

3 Agriculture and Natural Resources Research and Education Center, Semnan, Iran


Estimation of scour depth and understanding the flow field around pier would help to design with safer factor. In this study, we used the numerical model SSIIM as a CFD model to simulate flow and scour pattern simultaneously around single pier. The model was verified using laboratory data including the results reported for single pier. In this model, we considered the  as a turbulence model to solve the 3D Navier-Stokes flow equations and used their outputs as inputs of sediment transition equations. Comparison between scour calculations of SSIIM model and experimental terms showed that the model has appropriate deviation value for estimating the maximum scour depth around single pier. Numerical and graphics discussions of scour pattern and flow field have been done in various simulation time for pier. Graphical results showed that the down flow at front of pier and upward flow at the rear of pier. In addition, the maximum down flow was simulated with high accuracy in compare with experimental results.


Main Subjects

Baareh A., Sheat A. F. and AL-Khanifes K. (2006).  Forecasting sedimet load in river flow in the USA: A comparison between Auto-Regression and neural network Non-parametric models. J. Comput. Sci., 2(10), 775-780.
Beheshti A. and Ashtiani A. (2008). Numerical simulation of scour and flow field around pier group, 4th Civil Conference, Univercity of Tehran, Tehran. Iran [In Persian]
Breusers H., Nicollet G. and Shen H. (1977). Local scour around cylindrical piers. J. Hydraul. Res., 15(3), 211–252.
Dargahi B. (1990). Controlling mechanism of local scouring. J. Hydraul. Eng., 116(10), 1197-1214.
Dey S. and Raikar R. (2007). Characteristics of horseshoe vortex in developing scour holes at piers. J. Hydraul. Eng., 133(4), 399-413.
Hajebi F. and Meftah-Helghi M. (2014). 3D simulation of scouring around pier within a long contraction with applying numerical model SSIIM. J. Water Soil Conserv., 21(5), 241-256 [In persian].
Mahjoob B., Mohammadnezhad B. and Behmanesh J. (2014). Numerical modeling of local scouring around group bridge piers and compared with experimental results. J. Water Soil, 28(2), 267-275 [In Persian].
Melville B.W. and Chiew Y. M. (1999). Time scale for local scour at bridge piers. J. Hydraul. Eng., 125(1), 59-65.
Melville B.W. and Raudkivi A. J. (1977). Flow characteristics in local scour at bridge piers. J. Hydraul. Res., 5(1), 373-380.
Melville B.W. and Sutherlands A. J. (1988). Design method for local scour at bridge piers. J. Hydraul. Eng., 114(10), 1210-1226.
Mia F. Nago H. (2003). Design method of time dependent local scour at circular bridge pier. J. Hydrul. Eng., 129(6), 212-224.
NajiAbhari M. Ghodsian M. and Vaghefi M. (2009). Experimental and numerical flow pattern around the breakwater at a 90 degree bend. 8th Civil Conference in Iran, Shiraz University. [In Persian]
Norouzi H. Salehi S.A. Nasiri F. and Azarderakhsh M. (2009). Three dimensional numerical simulation of scoring around piers.  J. Modares Eng. Technol., 36, 13-23 [In Persian].
Olsen N.R.B. (1999). Computational fluid dynamics in hydraulic and sedimentation engineering, Department of Hydraulic and Environmental Engineering, The Norwegian University of Science and Technology.
Olsen N.R.B. and Melaaen C. (1993). Three-dimensional calculation of scour around cylinders. J. Hydraul. Eng., 119(9), 1048-1054.
Richardson E. and Davis S. R. (2001). Evaluating scour at bridges (4th ed.). Federal Highway Administration Hydraulic Engineering Circular, No18, FHWA NHI 01-001.
Sadeghian A., Hadian M. and Zarrati A. (2012). Using of SSIIM application in simulation the scour hole. 11th Hydrolic Conference in Iran, Urmia Uuniversity, Urmia, Iran [In Persian].
Salaheldin T. M., Imran J. and Chaudhry M.H. (2004). Numerical modeling of three-dimensional flow field around circular piers. J. Hydraul. Eng., 130(2), 91-100.
Vaghefi M., Safarpoor Y. and Hashemi S. (2015). Determining the amount of scour and three-dimensional velocity components around the T-shape spur dike in channel bend using numerical method and experimental data. J. Irrigat. Water Eng., 19, 109-123 [In Persian]
Van Rijn L. C. (1987). Mathematical modelling of morphological processes in the case of suspended sediment transport. PhD Thesis, Hydraulic and Geotechnic Engineering Departement, Delft University of Technology, Delft.