AbstractA sloping top breakwater covered with wave dissipating blocks (STBWB) has been developed and placed in service under extremely large wave conditions in Japan. The U-breakwater in N-port, designed as an STBWB, and constructed using 50t Dolos (Kd number 20) has been in service since the 1980s. Recently, newly developed 100t wave dissipating blocks (Kd number 10) were used to extend the U-breakwater. The stability of the new U-breakwater blocks was certificated by hydraulic experiment of detailed design. However, breakage of caisson wall, as shown in Figure 1, was caused by the large wave energy of Typhoon 19 in 2014. To clarify the failure mechanics, we conducted a series of hydraulic experiments.
Sato, Yamagata, Takahashi, Furukawa and Hosoyamada (1992): Hydraulic Characteristics of Sloping Top Breakwater Covered with Wave Dissipating Blocks, Proc. Japanese Conf. of Coastal Eng., Vol.39, pp.556-560.
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