Mohammad Vaghefi - Assistant Professor of Hydraulic Structures, Department of Civil Engineering, Persian Gulf University, Bushehr, Iran.
Maryam Akbari - M.Sc. of Hydraulic Structures, Department of Civil Engineering, Persian Gulf University, Bushehr, Iran
Arash Adib - Associate Professor of Water Engineering, Department of Civil Engineering, Shahid Chamran University, Ahwaz, Iran

In this research, a bend channel with a 180 degree central angle (curvature radius to channel width equal to 2) was designed and built in the hydraulic laboratory of Persian Gulf University in order to help better understand complicated flow pattern in a sharp bend. Vectrino velocimeter was employed to measure velocity components and determine bed shear stress. This paper studied the effect of the length of L-shaped spur dikes on the Reynolds shear stress variations. The results of such experiments indicated that a 67% increase in spur dike length would cause bed shear stress to increase by about 53%.

Reynolds shear stress, flow pattern, sharp bend, L-shaped spur dike, Vectrino