wavespectra.construct.frequency.pierson_moskowitz

wavespectra.construct.frequency.pierson_moskowitz(freq, fp, alpha=0.0081, hs=None, **kwargs)

Pierson and Moskowitz spectrum for fully developed seas (Pierson and Moskowitz, 1964).

Args:

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

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

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

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

Returns:

• efth (SpecArray): Pierson-Moskowitz frequency spectrum E(f) (m2s).

Note:

• If hs is provided the spectra are scaled so that \(4\sqrt{m_0} = hs\) and the scaling parameter alpha becomes irrelevant.

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