Abstract
ABSTRACT Shih, R.-S. and Weng, W.-K., 2016. A study of long wave attenuation over composite undulating breakwaters. In this study, the wave attenuation of multiple impermeable sinusoidal profile breakwaters is investigated by a physical experiment conducted in a 21-m wave flume with a combination of breakwaters collocated with various widths (w) and heights (D). The breakwaters were arranged in different permutations and combinations (from one to three sets) on the bottom of various undulating slopes. The attenuation effect when waves propagated through the periodic-gradational undulating terrain was explored, and the optimization of various sinusoidal breakwaters was analyzed. This article discusses the properties of wave reflectance (Kr), transmittance (Kt), the energy loss coefficient (KL), and the attenuation of composite terrain, including the optimal combinations of obstacles. The values of Kr, Kt, and KL were diverse because of various breakwater combinations and various wave conditions. The result...
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