Torsethaugen Wave |
 
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Torsethaugen Wave |
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Torsethaugen and Haver (2004) developed a double peak spectral model which represents wave conditions in open ocean areas where the waves are dominated by local wind sea, but also exposed to swell. For the locally fully developed sea, the spectral peak period is a function of the significant wave height, Tpf=af*Hs1/3, with af slightly dependent on fetch. This classifies sea states as wind sea Tp<=Tpf and swell Tp>Tpf each consisting of two wave systems. Empirical parameters given by significant wave height and spectral peak period define the spectral form parameters and energy distribution between the two wave systems in the model. The adequacy of the model is verified by comparing with measured wave spectra from the Norwegian Continental shelf. The Torsethaugen spectrum is based on the following formulation:
(1)
and 
(2)
and 
(3)
where:
•j = 1 for the primary sea system, j = 2 for the secondary sea system
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For a wind dominated sea, parameters for the primary and secondary peaks are defined as follows:
Primary Peak:
(4)
Secondary Peak:
(5)
where:
(6)
For a swell dominated sea, parameters for primary and secondary peaks are defined as:
Primary Peak:
(7)
Secondary Peak:
(8)
where:
(9)
•*WAVE-TORSETHAUGEN is used to specify a Torsethaugen random sea wave spectrum or spectra.