A confusion about the code of wave Spectrum in NWT

[zuiwohuaqian]

Hello Guillaume,
Recently I read the codes of wave spectrum in https://github.com/LHEEA/HOS-NWT/blob/master/sources/main/initial_condition.f90#L261，I have some confusions.

1. For JONSWAP spectrum, compared with JONSWAP equation, the source code missed a parameter alpha
2. For Bretchneider spectrum, the source code missed Hs.

Why does there exist difference?

Reference:
https://www.orcina.com/webhelp/OrcaFlex/Content/html/Waves,Wavespectra.htm
Sincerely,
huaqian

[gducrozet]

Hello Huaqian,

After the specification of the wave spectrum shape that you have found, there is an iterative procedure to impose exactly the target significant wave height. This iterative procedure is adjusting the amplitude of the spectrum accordingly. This is preferred to the only use of the analytical formula to have a better control of the significant wave height.

Best,
Guillaume