Abstract
The breakwater is a beach construction structure that is used to anticipate and control abrasion. The structure of the wave damper has experienced significant developments. One of the structures of the wave damper is a hollow wave breaker. Hollow breakwater has a varied model, besides minimizing wave of reflection, it is also expected to reduce transmission waves. The reason is because of its ability to absorb wave energy and to reduce the energy of incoming waves. This research is a preliminary simulation as the basis for determining the sloping hollow breakwater model. The study was conducted experimentally in a laboratory with the variables studied include the wave period (T), wave height (H), and wavelength (L). Variable water level (d) is arrange with variations of 21, 24, and 27 cm and the model parameters are cylindrical cavity volume (S), square cavity volume (P), and the slope of the breakwater (a). The results of research based on the theory of wave attenuation and previous studies of the hollow/porous shoreline protection model show that the holes and cavities in the proposed model are expected to work to capture the orbital wave flow and reduce their energy in the cavity through the turbulence process.
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