Characteristics of coastal-trapped waves induced by typhoon along the southeast coast of Honshu,Japan |
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Authors: | Yosuke Igeta Yujiro Kitade Masaji Matsuyama |
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Institution: | (1) Department of Ocean Sciences, Faculty of Marine Science, Tokyo University of Marine Science and Technology, Konan, Minato-ku, Tokyo 108-8477, Japan;(2) Present address: Japan Sea National Fisheries Research Institute, Fisheries Research Agency, Suido-cho, Chuo-ku, Niigata-shi, Niigata 951-8121, Japan |
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Abstract: | Mooring observations using ADCP, electromagnetic current meters and thermometers were performed to clarify the vertical and
horizontal structure of coastal-trapped waves (CTWs) on continental shelf and slope on the eastern side of Sagami Bay, Japan,
in August and September 2003. A strong inflow associated with CTW caused by Typhoon 0315 (CTW15) was observed with remarkable
downwelling. The maximum current due to CTW15 was over 100 cm s−1, confined to the upper layer shallower than 90 m. The CTW (CTW10) induced by Typhoon 0310, was associated with the coastal
upwelling and maximum outflow was 33 cm s−1; the currents were extended near the bottom at 230 m depth. Remarkable discrepancies were found between the current structures
of CTWs. CTW15 was explained by superposing the second CTW mode on the first CTW mode, whereas CTW10 was explained by the
first CTW mode. The generation and propagation processes of both CTWs were reproduced by numerical experiments using a three-dimensional
level model. The model results indicated that the difference of modal characteristics between CTW15 and CTW10 already exists
in the CTW generation region and are due to difference of the wind direction, i.e., the typhoon’s path. |
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Keywords: | Coastal-trapped wave modal characteristics typhoon Kyucho Sagami Bay ADCP numerical experiments |
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