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Characteristics of coastal-trapped waves induced by typhoon along the southeast coast of Honshu, 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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Author notes

  1. Yosuke Igeta

    Present address: Japan Sea National Fisheries Research Institute, Fisheries Research Agency, Suido-cho, Chuo-ku, Niigata-shi, Niigata, 951-8121, Japan

Authors and Affiliations

  1. Department of Ocean Sciences, Faculty of Marine Science, Tokyo University of Marine Science and Technology, Konan, Minato-ku, Tokyo, 108-8477, Japan

    Yosuke Igeta, Yujiro Kitade & Masaji Matsuyama

Authors
  1. Yosuke Igeta
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  2. Yujiro Kitade
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  3. Masaji Matsuyama
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Correspondence to Yosuke Igeta.

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Igeta, Y., Kitade, Y. & Matsuyama, M. Characteristics of coastal-trapped waves induced by typhoon along the southeast coast of Honshu, Japan. J Oceanogr 63, 745–760 (2007). https://doi.org/10.1007/s10872-007-0064-z

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  • DOI: https://doi.org/10.1007/s10872-007-0064-z

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