The experiments were conducted in the CIEM flume of the
Catalonia University of Technology, Barcelona. The dimensions
of the flume are 100m length, 5m depth and 3m width. The
FB was placed in the horizontal part of the flume in 2m water
depth. The length B of the breakwater was 2 m, the height 1.5m
and the transverse length 2.8 m. An HR Wallingford wedgetype,
wave maker was used, while the experimental equipment
consisted of a number of Wallingford wave gauges, Huba Control
pressure transducers, and two-component Delft Hydraulics
current meters. In Fig. 1, the layout of the flume and the instrumentation
are shown for the single breakwater test, while the
double breakwater case is presented in Fig. 2. During the experiments,
a moving carriage was used for the wave gauges for calculating reflection to maintain the appropriate distances proposed
by Mansard and Funke (1980) between the three wave
gauges and a distance greater than at least a half wavelength
between the carriage and the structure.Wave gauges in the lee of
the structure, used for the estimation of transmission, were also
placed at different locations during the experiments to maintain
at least half a wavelength from the structure and half wavelength
between them. The sampling frequency during the experiments
was 20 Hz.