Abstract
It is considered that proper oscillations with several minute periods are driven in shallow water by swells which invade the shallow water, and the proper oscillations cause the swells to beat with the same periods as the proper oscillation periods. Furthermore, it is considered that these phenomena cause ship's dragging anchor and waves to invade over breakwater. The proper oscillations in shallow water and the beat phenomena of swells due to the proper oscillations were investigated by wave generating experiments, in order to prevent the wave disasters.
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