4.1 Non-Linear Energy Transfer in Wind Wave Spectrum
101
a)
b)
-0.001
-0.004
-0.016
-0.063
-0.250
-0.750
-0.906
-6.00
-4.00
-2.00
0 .00
2.00
4.00
6.00
Fig. 4.9. Normalized spectral energy density (4.16) (a) and non-linear transfer
function (b) for peakness 1 = 3.3 and angular distributions (4.17), (4.18)
for the peakness "( = 1.0 show analogous details, but the non-linear transfer
function is much more extended over the plane { u, ,8}. The maximum of the
new positive value comprises 4.5 per cent of the main maximum.