Initial density profile of the incoming wave with a CH density of ρ_CH = 0.1. The sharp density drop represents the CHB. We chose ρ_IAE = 1.1 for the initial enhanced amplitude (which corresponds to △ρ = 0.1, ρ₀ = 1.0, and x₀ = 0.5 in Eq. (4)), ρ_IAD = 0.8 for the initial depleted amplitude (which corresponds to △ρ = −0.2, ρ₀ = 1.0, and x₀ = 0.2 in Eq. (4)), ρ_IWE = 0.2 for the initial width of the enhanced part (which corresponds to △x = 0.2 in Eq. (4)), and ρ_IWD = 0.4 for the initial width of the depleted wave part (which corresponds to △x = 0.4 in Eq. (4)).