(For the equations please see the PDF file.)

and its more applicable formula,

(For the equations please see the PDF file.)

in which d₁ = 1.32×10^-4, d₂ = 2.61.

This expression overcomes the flaw of other present third-generation numerical wave models, for it gives lower dissipation value for the high sea state condition.

Application of the above source function improves the LAGFD-WAM numerical wave model. Results show that, in high wind condition, the model gives higher wave height than those obtained by the WAM model, and in low and middle wind condition, two models ‘give similar results. In the simulation of an observed typhoon wave, the new model is a good improvement over the WAM model.