Study of undertow oscillations using an analytical model and some numerical simulations

1622-1629Undertow is one of the most common phenomena governing the ocean beaches. This study investigates the effects of hydrodynamic parameters and bed slope on the undertow oscillations by means of an analytical model and some numerical simulations. Model predictions are compared with numerical simulation results of waves and currents velocities throughout the entire undertow system and show some reasonable agreement. The results indicate that undertow velocity increases with parametric forcing intensity (γ). So that if γ violates a specific limit, the velocity of undertow will decrease. The numerical results of this study also show that undertow velocities are larger over steeper beaches than on gently sloping beaches