EM 1110-2-1100 (Part II)
(Change 1) 31 July 2003
Figure II-2-21. Phillips' constant versus fetch scaled according to Kitaigorodskii. Small-fetch data are
obtained from wind-wave tanks. Capillary-wave data were excluded where possible (Hasselmann et al.
the basic energy-growth equations were quite similar for the two formulations. The f-4 formulation is
incorporated into CERC's WAVAD model, used in its hindcast studies.
(14) Since the early 1980's, a new class of wave model has come into existence (Hasselmann et al. 1985).
This new class of wave model has been termed a third-generation wave model (3G). The distinction between
second-generation and third-generation wave models is the method of solution used in these models. Second-
generation wave models combine relatively broad-scale parameterizations of the nonlinear wave-wave
interaction source term combined with constraints on the overall spectral shape to simulate wave growth.
Third-generation models use a more detailed parameterization of the nonlinear wave-wave interaction source
terms and relax most of the constraints on spectral shape in simulating wave growth. Various third-generation
models are used around the world today; however, the third-generation model is probably the WAM model.
Meteorology and Wave Climate