Nonlinear Evolution Equations for Broader Bandwidth Wave Packets in Crossing Sea States

Figure 4

Growth rate of instability 𝐺_𝑟=Im(Ω) against perturbation wavenumber 𝐿 for broad band wave packets when 𝑎₁₀=0.18 and 𝑎₂₀=0.15: —  𝜃=5°, — 𝜃=10°, - · - · - 𝜃=15°, - - - - - 𝜃=20°, ⋯𝜃=30°.