numerical investigation of formation of bed topography in a u shape channel bend with lateral intake with ssiim2

the mechanism of flow and sediment transport in channel bend is much complex. because of secondary current, the sediment moves away from outer bank toward inner bank and therefore outer bank of the bend is one of best positions for lateral diversion. in this paper, the mechanism of sediment transport was simulated with ssiim software in the u shape channel with lateral intake. in order to verify the numerical model results used in montaseri’s lab studies, the position of injection was upstream of bend and sediment injection rate was approximately is equal to 250 gr/min and frude number is equal to 0.32. the ssiim numerical model solves the navier-stokes equations with the k-ε model on a three-dimensional. the bed load can be calculated van rijn’ formula. the numerical model has been implemented at various times to see how the formation and development of bed forms in the u shape channel with lateral intake. the numerical results show that the prediction of development of bed forms, mechanism of sediment entry to intake, location of intermittent dune and location of sediment accumulation are in fairly good agreement with experimental data and the maximum error occurred in front of intake.