Environment: Data for Torsethaugen spectrum

$\newcommand{\fmL}{f\urm{m1}}$ $\newcommand{\fmH}{f\urm{m2}}$

The Torsethaugen spectrum is a double peaked spectrum particularly suited to North Sea conditions. It enables you to represent sea states that include both a remotely generated swell and local wind-generated waves.

Full details of the formulation used are found in the Torsethaugen and Haver paper.

Hs, fm and Tp

The Torsethaugen spectrum is defined by $\Hs$ and one of the linked parameters $\{\fm,\Tp\}$. The $\fm\text{ and }\Tp$ data items are linked by the relationship $\fm=1/\Tp$. If you enter one, the other will be updated accordingly.

fm1 and fm2

The frequencies for the primary and secondary spectral peaks. For both wind-dominated and swell-dominated sea states, $\fmL{=}\fm$. For wind-dominated sea states, $\fmL{\gt}\fmH$. For swell-dominated seas, $\fmL{\lt}\fmH$.

Warning: The Torsethaugen spectrum makes no allowance for the directionality of the swell and wind components of the sea state but, in reality, the separate components frequently come from different directions. It is therefore more appropriate to model a bi-directional two-peaked sea state using two separate OrcaFlex wave trains, one for the swell component and one for the local wind generated component.