The quadruplet-wave interaction controls
· the shape-stabilisation of the high-frequency part of the spectrum
· the downshift of energy to lower frequencies
· frequency-dependent redistribution of directional distribution functions
The quadruplet-wave interaction in the spectral wave module is described by the accepted approximate Discrete Interaction Approximate (DIA), Komen et al. (1994). The DIA has been found quite successful in describing the essential features of a developing wave spectrum.