PERFORMANCE OF VARIATION OF BEACH-TYPE WAVE ABSORERS Porous Ramps and Parabolas in WAVE TANK MARINE TECHNOLOGY LABORATORY
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Abstract
unstable global climate change, sea waves can damage coastal areas and buildings
surrounding. Wave dampers are needed to reduce the energy of incident waves and reflected waves
excessive and undesirable in water areas. The effectiveness of wave dampers for sloping beach types
and porous parabolas to dampen reflected water waves are the objectives of this study. This research
carried out at the Marine Technology Research Laboratory, Hasanuddin University. Regular waves are tested in
wave flume with a length of 25 m, a width of 1 m and a depth of 1.2 m which is equipped with a wave generator
flaps type. The wave absorbers at the other end are made of 20 cm thick foam and mounted on
porous steel cross-section with a porosity of 0.155091. The eight wave probe points are placed together along the length
wave flume. Wave probe 8 is placed as far as the wavelength from the wave damper and is 1/8 away
wavelength between probes 1-8. Water level fluctuation data is processed to obtain wave height in each
wave probe using zero up crossing method. To test the performance of this wave damper, performed
tests and their reflection coefficients are compared with other theoretical and experimental models. Test
laboratory is carried out to acquire wave data and numerical data processing is carried out for
clarify results. Wave damping experiments carried out in the laboratory produce damping
relatively good waves where the reflection coefficient values obtained on average are below 0.2 (Hr/Hi) will
but the performance of the wave damper in the laboratory is not as effective as the damper using chunk media
stone so further development and analysis is needed.
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