investigation of the effects of bed forms on sediment transport coefficient by taking interaction of wave-current into account

in this paper, the effects of bed forms on sediment transport coefficient were studied by using two physical and mathematical modeling programs, in order to generate the graphical changes of bed profiles under effects of waves and currents. sediment transport coefficient (stc) is defined as the ratio of sediment velocity to the velocity of water particles. stc was studied at different states of currents, waves, and wave’s interaction with currents in order to define a modified ratio for bed load movements in the boundary layer. if applying this modified ratio (stc), in the mathematical program, improve the graphical changes in bed level and have a better fitness with the measured changes, it will have more validity to use it in the modeling programs instead of using the previous values of stc which considered a single value for this ratio. however, reliable experimental data are essentially required to examine the validity of the model.