netsse.model.envir_cond.wavespec1dto2d

netsse.model.envir_cond.wavespec1dto2d(S1d, theta, theta0, s)

Transforms a 1-D wave spectrum into a 2-D wave spectrum.

A cosine-2s function is used for the directional spreading distribution.

Parameters:

• S1d (array_like of shape (Nfreq,)) – 1-D wave spectrum.

• theta (array_like of shape (Ntheta,)) – Vector of wave headings [deg] at which the 2-D spectrum must be computed.

• theta0 (float) – Mean wave direction [deg].

• s (float) – Spreading parameter [-], related to the exponent of the cosine function.

Returns:

• S2d (array_like of shape (Nfreq,Ntheta)) – 2-D wave spectrum, as a function of both the frequency and the wave heading [deg].

• D_theta (array_like of shape (1,Ntheta)) – Directional spreading function, as a function of the wave heading [deg].

References

Naess, Arvid, and Torgeir Moan. 2010. Stochastic Dynamics of Marine Structures. Stochastic Dynamics of Marine Structures. Vol. 9780521881555. Cambridge University Press. https://doi.org/10.1017/CBO9781139021364.

Example

>>> S2d = wavespec1dto2d(S1d,theta,theta0,s)