Document Type : Research Paper
University of Guilan
university of guilan, faculty of agriculture.
Dept. of Water Engineering, University of Guilan, Rasht
Associate Professor, Dept. of Civil and Environmental Engineering, Politecnico di Milano, Milan, Italy
Scour around the bridge piers is a kind of erosion that occurs due to complex vortex flows and finally creates a hole around the bridge piers (Yang et al., 2019). One of the critical issues in this field is to ensure that the equilibrium scour depth and the time to reach it, is achieved. Although many researches have been done to determine the equilibrium scour time, there is still no suitable criteria for determining the equilibrium scour time for the complex piers which consist of the pile group, pile cap and piers. In the present study, considering the importance of this fact that the local scour process is dependent on time, the effect of the complex pier geometrical parameters on the equilibrium scour time around the complex pier is investigated. In addition, a regression equation for the estimation of equilibrium scour time was presented where have suitable performance to estimate desired output in the range of the experimental data of the present study.