Wave filters and absorbers are important coastal structures. Because of their nonlinear characteristics, wave filters and absorbers must be analyzed and optimized experimentally. In a more general approach, two universally valid coefficients are determined for each individual filter element. Based on these data, arbitrary, multi-layer wave absorbers can be evaluated. Filter hydrodynamics mainly depend on porosity and wave kinematics. The corresponding coefficients, which are universally applicable, in connection with the relevant horizontal velocity and acceleration at the filter area are used to calculate the reflection, transmission, energy dissipation, and wave forces on arbitrary filter or absorber components. The numerical analysis is validated by an experimental program in regular and irregular seas, and transient wave trains. For a variety of wave filters, the paper presents the evaluation of the foregoing characteristic coefficients, based on experiments with representative transient wave groups. The model tests in extreme wave conditions (freak waves). Tests with breaking transient wave packets prove that the obtained maximum wave force on a structure is much higher than the long-term model test results in irregular waves, for a given spectrum.
Hydrodynamic evaluation of multi-layer wave filters and absorbers
1999
10 Seiten, 19 Quellen
Article (Journal)
English
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