Effects of Two-Peak Spectra on Wave Crest Statistics

Abstract

Effects of two-peak spectra on the second order wave statistics is investigated by second order time domain simulations. Particular attention is given to the wave crest statistics. The two-peak Torsethaugen frequency spectrum (1996) currently used by the Norwegian industry is adopted. Both 2D and 3D seas are considered, and for 3D different directional spreading functions for wind sea and swell are applied. The results for the Torsethaugen frequency spectrum are compared with prediction given by the JONSWAP spectrum and the 2nd order Forristall (2000) crest model.