Observation of edge waves trapped on the continental shelf in the vicinity of Makurazaki Harbor, Kyushu, Japan |
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| Authors: | Takashi Yanuma Yoshinobu Tsuji |
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| Institution: | (1) PASCO Environmental Science Institute, 2-32-1, Yoga, Setagaya-ku, Tokyo, Japan;(2) Earthquake Research Institute, University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo, Japan |
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| Abstract: | Sea-bottom pressure gauges were used to measure sea levels at two points on the shelf off the southern coast of Satsuma Peninsula,
Kyushu, Japan. Spectral analysis of the observed records and the tide-gauge record of Makurazaki Harbor revealed several predominant
common peaks. At the same time, the eigenmodes for the trapped waves on the shelf and inside Makurazaki Bay were obtained
numerically using a two-dimensional model, and the periods and the spatial distribution of amplitudes of the proper modes
were obtained. A comparison of the calculated modes with the periods and phase patterns of the observed peaks clarified that
peaks with periods of 19.5, 16, 13.3, and 12.2 minutes in the shelf region were the modes of standing-edge waves, and the
peak with the period of 16 minutes in Makurazaki Harbor was the fundamental mode of the harbor. Among the modes of standing-edge
waves, the mode of the period 16 minutes on the shelf had nearly the same period as that of the fundamental mode of Makurazaki
Harbor. An analysis of changes of spectral densities of these two modes confirmed that the fundamental mode of the Makurazaki
Harbor was induced by this standing-wave mode. |
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| Keywords: | Standing edge wave resonance mechanism modal solution Makurazaki Harbor |
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