An Extended Analytic Solution of Combined Refraction and Diffraction of Long Waves Propagating over Circular Island

Figure 2

Effects of the porosity of the permeable material (𝜌₀=0.2𝜋, 𝜌₁=0.1𝜋, 𝑓_𝑝=1).

(a) 𝛼=1

(b) 𝛼=2