A SOURCE FUNCTION FOR WAVE FORECAST MODEL - DURATION LIMITED CASE

A new source function which parametrically represents the combined eff ects of wind forcing, wave-wave interactions and dissipative losses, i s suggested for the wind wave transport equation. The new source funct ion has a tan hyperbolic form with four tunable wind dependent coeffic ients. Its forecast performance for duration limited cases is compared with that of the conventional source function (viz, the Complimentary Error Function type) through the numerical integration of the wave tr ansport equation. With the new source function, the wave height foreca st errors are found to be < 8% with respect to known wave growth nomog rams, while the errors are 15-28% for the conventional source function .