“…Both figures show that A dmax /A i converges to ≈ 1.2 at high frequency. The convergence of A dmax /A i was also observed in Masoudi and Gan (2020) for submerged breakwaters and shows a minimum transmission coefficient almost zero in high incident wave frequencies (f i > 0.3 in this case). Comparing (c) and (d) reveals that larger α leads to higher A dmax /A i and this is the main reason for diminishing T w in Figure 6.…”