Abstract—

The results of an analysis of wave observations in Dvoinaya Bay at the southern part of Matua Island (Kuril Ridge) are reported. Experimental studies were carried out in order to determine the probability of amplifying the incoming waves in the coastal zone of the island. The observations provided the records of waves at two points of the bay located at depths of ~10 and 20 m, with a discreteness of 1 s. The spectral analysis of the time series allowed wave processes with a period of 40 s and in the range of periods of 1–12 min to be identified. It is shown that the former are related to infragravity waves; in the range from 1 to 7.3 min, they are seiches of Dvoinaya Bay. In this case, oscillations with a period of about 1.8 min can be manifested in the form of harbor oscillations with a significant increase in their energy during a storm. Waves with a period of ~12 min are of seiche nature as well and are associated with the zero Helmholtz mode, while the effect of “swinging” of these oscillations may occur in the case of a tsunami wave arrival.

中文翻译：

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千岛岭马图阿岛南部的危险海现象

摘要—

据报道，在马图阿岛（库里尔海岭）南部的德沃伊纳亚湾，波浪观测结果得到了分析。为了确定在该岛的沿海地区放大入射波的可能性，进行了实验研究。观测结果提供了在约10和20 m深度处间隔为1 s的海湾两个点处的波浪记录。通过对时间序列进行频谱分析，可以确定周期为40 s且波动范围为1-12 min的波动过程。结果表明，前者与次重力波有关。在1至7.3分钟的范围内，它们是德沃亚纳亚湾的景点。在这种情况下，大约1.8分钟的振荡可以以港口振荡的形式表现出来，在风暴期间其能量会显着增加。