Fariba Sadat Esfahani - M.Sc Student of Hydraulic Structure of Shiraz University
Ali Reza Keshavarzi - Associated Professor of Water Engineering Department of Shiraz University

In this study, an effort was made to understand flow structure and in particular secondary currents inside the river meander. For this purpose, a physical model was used. Three dimensional flow velocities were measured using ADV in 360 different nodal points. From the result of this study, some secondary currents were recognized inside the meander and situation of vortices changes spatially along the meander. Also direction of secondary currents is towards outer bank from entrance to middle of the meander and it is vice versa from middle to the end of the meander. bove information helps engineers to protect river meanders where the secondary currents cause erosion.

flow structure, meander, secondary currents, ADV.