3.1.1 Two sea states should be used. The model
should be tested in a long-crested irregular seaway at maximum significant
wave steepness of Hs/(gTp2/(2π))=0.05. In
the absence of information on specific spectrum data, JONSWAP type
spectra should be used with a peak enhancement factor γ =3.3.
In the first sea state, Hs should be the maximum significant
wave height for the area of operation, which is not exceeded by a
probability of more than 10% on a yearly basis, but limited to a maximum
of 4 m. In the second sea state Hs should represent the
significant wave height corresponding to the most onerous relative
bow motion (worst intended conditions).
3.1.2 Generation of the waves should be such that
each wave realization results in a non-repeating wave train during
the model test.