wavespectra.construct.frequency.jonswap

wavespectra.construct.frequency.jonswap(freq, fp, alpha=0.0081, gamma=3.3, sigma_a=0.07, sigma_b=0.09, hs=None, **kwargs)

Jonswap frequency spectrum for developing seas (Hasselmann et al., 1973).

Args:

• freq (DataArray, 1darray, list): Frequency array (Hz).

• fp (DataArray, float): Peak wave frequency (Hz).

• alpha (DataArray, float): Phillip’s fetch-dependent scaling coefficient.

• gamma (DataArray, float): Peak enhancement parameter.

• sigma_a (DataArray, float): width of the peak enhancement parameter for f <= fp.

• sigma_b (DataArray, float): width of the peak enhancement parameter for f > fp.

• hs (DataArray, float): Significant wave height (m), if provided the Jonswap spectra are scaled so that \(4\sqrt{m_0} = hs\).

Returns:

• efth (SpecArray): Jonswap spectrum E(f) (m2s).

Note:

• If hs is provided than the scaling parameter alpha becomes irrelevant.

• If two or more input args other than freq are DataArrays, they must share the same coordinates.