Abstract

One type of breakwaters that can be used to protect port basin is floating breakwaters. The use of floating breakwaters is suitable for relatively large water depths. In deep waters, the floating breakwaters volume is smaller than rubble mounds breakwater. Consequently, floating breakwaters are cheaper than rubble mounds breakwater. Unfortunately, a practical approach to analysing the performance of floating breakwater in reducing wave height is unknown. Floating breakwater performances indicated by wave transmission coefficient. Therefore, in this study an analytical wave transmission coefficient was formulated. The simple formula can be used to estimate high of wave at behind of floating breakwater. Based on these equations, the wave transmission coefficient influenced by the wave parameters and structural parameters. Wave parameters represents by wave high, wave period, water depth and wave length while structure parameters represents by both of width and draft of structure. Wave transmission coefficient also influenced by the wave frequency and having motion frequency.

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