netsse.analys.buoy.cross_spec2Fourier_coef

netsse.analys.buoy.cross_spec2Fourier_coef(Gf)

Computes the Fourier coefficients from the cross-spectra of a heave-East-North wave buoy, as per Benoit et al. (1997).

Parameters:

Gf (array_like of shape (3,3,Nf)) – Cross-spectra (Heave-East-North), as a function of frequency in Hertz.

Returns:

• Sf (array_like of shape (Nf,)) – One-sided variance spectrum of the waves [m^2.s], as a function of frequency in Hertz.

• a1, a2, b1, b2 (array_like of shape (Nf,)) – Frequency-dependent Fourier coefficients of the directional wave spectrum.

See also

Shannon_MEMII_Newton

Reconstructs the directional spreading function based on the first four Fourier coefficients of a directional wave spectrum.

References

Benoit, M., Frigaard, P., & Schäffer, H. A. (1997). Analysing Multidirectional Wave Spectra: A tentative classification of available methods. Proceedings of the 27th IAHR Congress, San Francisco, CA, USA (pp. 131–158). Canadian Government Publishing.

Example

>>> Sf, a1, a2, b1, b2 = cross_spec2Fourier_coef(Gf)