the heave motion FB indicates that it performs in a dissipative manner.
The comparison of the fixed and the heave motion FB reveals a very basic difference in the structure hydrodynamics. The heave motion FB performs in a dissipative manner, contrary to the fixed breakwater which performs in a reflective manner. Although the transmission coefficient is almost the same for both configurations, with the fixed breakwater showing a slightly better performance, the reflection and dissipation coefficients present totally different trends due to the high energy dissipation in the case of the heave motion FB.
Similar conclusions can be derived from Fig. 12 for irregular waves. The trend in the transmission coefficient is the same. There is a remarkable difference though in reflection and energy dissipation. The increased energy dissipation in the case of the heave motion FB leads to decreased reflection. Comparing values of Cd for regular and irregular waves in the case of the heave motion FB (Figs 11 and 12), energy dissipation is higher for irregular waves and B/L less than 0.1 with a value of the corresponding coefficient approximately equal to 0.7.