In Figs 16 and 17 the experimental results of Ct , Cr and Cd for the double fixed FB are presented. The influence of S/L
(S = the spacing between the two FBs) on the performance of the double FB is shown. The transmission coefficient decreases
with an increase of S/L from 0.2 to 1.4, where a resonance point is observed after which the transmission coefficient increases for both wave heights. The resonance of the water masses between