ABSTRACT
The generated waves are reflected by the wave absorber and other structures in the wave tank. Several methods have been developed to calculate the reflection of incident waves (Goda & Suzuki, 1976) (Mansard & Funke, 1980) (Isaacson, 1991). In particular, Goda-Suzuki’s method is commonly used in laboratories studies. The incident and reflected waves are calculated using two simultaneous wave records, η1 and η2, at adjacent locations, at a distance Δl (Goda & Suzuki, 1976),
η σ σ1 1 1 1 1+( )ηη + cosR x x A t B t (3)
η σ σ2 1 2 2+( )ηη + cosR x x l+1 A t B t (4)
where, σ is the angular velocity, t is the time, and ηI and ηR are respectively the surface elevations of incident and reflected waves. A1,2 and B1,2 are the real and imaginary parts of the frequency components of the two probes respectively. The method then stipulates that the incident and reflected wave amplitudes αI and αR and ϕR are given by Eqs. (5) and (6). Multiple gauges may be used to extend the effective frequency range (Hughes, 1993).
