BREAKWATER CHARACTERISTICS OF OPEN-TUBE SYSTEMS.
Rept. no. 73,
MASSACHUSETTS INST OF TECH CAMBRIDGE HYDRODYNAMICS LAB
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The characteristics of a breakwater of a new type are presented. This new breakwater acts as a scattering or de-tuning device for the periodically transmitted wave energy. In its ideal form it would produce a completely random output of the wave energy and dissipation through turbulence. The present versions of this breakwater consist of different arrays of open tubes aligned with the direction of wave motion and occupying approximately 30-40 percent of any partial section or of the total section through which the waves pass. Conventional breakwaters protect essentially by reflection of wave energy or by dissipation through breaking of the waves. By contrast, the breakwater type under investigation dissipates a major portion of the energy by currents induced in the tubes and generating turbulence at the tube exits, by surface resistance, and by interference with energy transmission through the array of tubes. Reflection is of minor importance. This study reports on the energy dissipation, reflection and transmission achieved with various combinations of wave characteristics and arrangements of open tubes as well as on the forces exerted by wave action on the breakwater. Author