Abstract
Numerical simulation of sand wave formation was conducted in the present paper. Saltation model was extended in order to accomplish this simulation. One of the all bed particles which expose on the surface is checked up arbitraly whether it can be picked up and make an incipient motion or not. And its trajectory is traced every time step until it ceases its motion and rests on the bed. Time variation of flow velocity field over the bed surface is also evaluated simultaneously in order to reflect the effect of bed evolution. In the present model, any turbulence models were not introduced for simplicity to understand the mechanism of this formation process more easily and the space in future work is still left open.
