In shallow water triad-wave interaction becomes important. Nonlinear transformation of irregular waves in shallow water involves the generation of bound sub- and super-harmonics and near-resonant triad interactions, where substantial cross-spectral energy transfer can take place in relatively short distance. The process of triad interactions exchanges energy between three interacting wave modes. The triad-wave interaction is modeled using the simplified approach proposed by Eldeberky and Battjes (1995, 1996).
Transfer coefficient
You can specify the transfer coefficient for triad-wave interaction. This coefficient controls the magnitude of the interaction. The default value is 0.25.