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Observation of edge waves trapped on the continental shelf in the vicinity of Makurazaki Harbor, Kyushu, Japan

Authors
  • Yanuma, Takashi1
  • Tsuji, Yoshinobu2
  • 1 PASCO Environmental Science Institute, 2-32-1, Yoga, Setagaya-ku, Tokyo, Japan , Tokyo
  • 2 University of Tokyo, Earthquake Research Institute, 1-1-1, Yayoi, Bunkyo-ku, Tokyo, Japan , Tokyo
Type
Published Article
Journal
Journal of Oceanography
Publisher
Springer Netherlands
Publication Date
Jan 01, 1998
Volume
54
Issue
1
Pages
9–18
Identifiers
DOI: 10.1007/BF02744377
Source
Springer Nature
Keywords
License
Yellow

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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