netsse.model.envir_cond.JONSWAP_DNV
===================================

.. py:function:: netsse.model.envir_cond.JONSWAP_DNV(Tp, Hs, omega, gamma='standard', h=0)

   Computes the JONSWAP spectrum corresponding to the input sea state
   parameters.

   The JONSWAP spectrum is formulated as a modification of
   a Pierson-Moskowitz spectrum for a developing sea state in a fetch
   limited situation.

   :param Tp: Peak period [s].
   :type Tp: float
   :param Hs: Significant wave height [m].
   :type Hs: float
   :param omega: Vector of angular frequencies [rad/s].
   :type omega: array_like of shape (Nfreq,)
   :param gamma: Peak shape parameter [-]. The value can be user-provided as a float.
                 Alternatively, if ``'standard'`` is input, then ``gamma`` will take the
                 standard value of 3.3., while a value ``'DNV'`` as input leads to
                 following the procedure 3.5.5.5 described in DNV-RP-C205.

                 .. tip::
                     Use ``gamma = 1`` to output a standard Pierson-Moskowitz spectrum.
   :type gamma: {'standard','DNV',float}, optional
   :param h: Water depth [m]. If ``h`` is specified as input argument, then the output
             JONSWAP spectrum is corrected to account for finite water depth, becoming
             a standard TMA spectrum as per Bouws et al. (1985).
   :type h: float, default 0

   :returns: **S_J** -- Standard wave spectrum [m^2.s/rad].
   :rtype: array_like of shape (Nfreq,)

   .. rubric:: References

   1. DNV-RP-C205, "Environmental Conditions and Environmental Loads,
      April 2007.
   2. Bouws, E., Gunther, H., Rosenthal, W., & Vincent, C. L. (1985).
      *Similarity of the wind wave spectrum in finite depth water. 1. Spectral form*.
      Journal of Geophysical Research-Oceans, 90(NC1), 975–986.
      https://doi.org/10.1029/JC090iC01p00975

   .. seealso::

      :py:obj:`lin_disprel`
          A fast and accurate approximation of the linear wave dispersion relationship in finite water depth.

   .. rubric:: Example

   >>> S_J = JONSWAP_DNV(Tp,Hs,omega,gamma='standard',h=0)