The bed forms in the surf zone can grow as a result of natural morphodynamic instabilities, forced by the wave-induced flow. This work gives a contribution to the dynamics of the formation and evolution the bed forms in surf zone. We use the new morphodynamic model, M-SHORECIRC, to analyze the growth and dynamics of bar-type, rhythmic, bed forms of a barred beach. These analyses include the effects of initial wave angle, wave energy, and bar location. These are all seen to influence the dynamics of the rhythmic bed-forms regarding the longshore length-scales, and intensity and location of bed-forms.