2020 Volume 76 Issue 2 Pages I_121-I_125
The breaking wave pressure can cause seawall and hinterland vibrations. In this study, to clarify the mechanism of this vibration, we conducted a hydraulic experiment. As a result, the followings were clarified. 1) An impulsive breaking wave force caused the seawall to vibrate, and the maximum acceleration was 6 m/s2. 2) The acceleration of the hinterland just behind the seawall was 1/10 of that of the seawall and decreased with the distance from the seawall. 3) Only the vibration with the natural frequency of the hinterland propagated. In contrast, other components besides this frequency attenuated with the propagation. 4) The phases of the horizontal and vertical components differ by half a period. This characteristic indicates that the vibration was a Rayleigh wave. 5) The trench to prevent the propagation of vibration was not very effective.
