Infragravity wave energy changes on a dissipative barred beach: A numerical study

A transition range associated to Ursell numbers between 0.3 and 1 separates two clusters associated to nonlinear energy transfers. For Ursell numbers below this range, nonlinear energy transfers occur from the short to the infragravity wave frequencies. In contrast, for Ursell numbers above this limit they occur from infragravity to the short wave frequencies. A parametrization widely used in operational wave models performs satisfactory for Ursell numbers between 0.1 and 1 over the simulated dissipative barred beach profiles.