台風8818号の通過に伴い発生した相模湾の急潮に関する数値実験  [in Japanese] Numerical Experiments on the Kyucho Current in Sagami Bay Associated with the Coastal-Trapped Waves Caused by Typhoon 8818  [in Japanese]

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Abstract

台風通過に伴う相模湾の急潮の発生機構を解明する目的で,連続成層モデルを用いた数値実験を行った。モデル海域に台風8818号を事例とした風応力を与えたところ,台風による強い北風の連吹により,房総半島東岸で強い沿岸流を伴う孤立沿岸捕捉波が発生した。この沿岸捕捉波は,陸棚幅が急激に狭くなる房総半島南東岸の勝浦沖で,順圧的な構造から傾圧的な構造へと性質を変化させると共に,岸近くで表層の沿岸流を強めることが判明した。この強い沿岸流を伴う沿岸捕捉波が相模湾へと伝播し,急潮を引き起こしたと考えられる.孤立沿岸捕捉波の伝播による急潮によってパ目視湾表層水(30m以浅)の約43%が交換された。Numerical experiments were performed using a multilevel model to clarify the generation mechanism of Kyucho (i. e. a coastal stormy strong current, induced by the Typhoon passage in Sagami Bay). The Typhoon 8818 was applied to the model domain. A solitary coastal-trapped wave (CTW) accompanied by a strong coastal current was produced along the east coast of Boso Peninsula by the southward wind associated with the Typhoon. The CTW changed its wave properties from a quasi-barotropic to baroclinic motion off the southeast coast of Boso Peninsula, with the rapid change of the bottom topography. The change of wave properties strengthened the current near the coast. After about 2 days of maximum wind at Choshi, the CTW, accompanied with a strong current, propagated into Sagami Bay, and caused the Kyucho in the bay. These results were sufficient to explain the characteristics of the Kyucho along the west coast in Sagami Bay as induced after passing of Typhoon 8818 in September 1988. The numerical experiment also indicated that the Kyucho exchanged about 43% of the surface water (above 30 m depth) in Sagami Bay.

Journal

  • 海の研究

    海の研究 12(6), 603-617, 2003-11-05

    日本海洋学会

References:  25

Cited by:  11

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Codes

  • NII Article ID (NAID)
    110003368812
  • NII NACSIS-CAT ID (NCID)
    AN10382760
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    09168362
  • NDL Article ID
    6754625
  • NDL Source Classification
    ZM44(科学技術--地球科学--海洋・陸水・火山)
  • NDL Call No.
    Z15-778
  • Data Source
    CJP  CJPref  NDL  NII-ELS 
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