丹後半島沿岸の前急潮  [in Japanese] Mae-Kyucho along the coast of Tango Peninsula  [in Japanese]

Access this Article

Search this Article

Author(s)

Abstract

<p>丹後半島沿岸において係留観測を継続して行ってきた結果,台風や温帯低気圧の通過前に急潮が発生し,定置網に被害をもたらす事例が少なくないことが分かってきた.本研究では,台風0514号の最接近前から発生した急潮について,現象の詳細な記述と発生機構の解明を試みた.係留観測記録から,丹後半島沿岸の水温が低下すると同時に半島東部に0.8 m s<sup>-1</sup>に達する強い北上流が生じたことが示された.この時の流れ場は,EOF第1モードとして,広い範囲で岸を左に見る流れの構造を形成しており,丹後半島の太鼓山の東西風と高い相関を持つことが示された.密度を水平に一様とし,風応力のみを与えた数値実験では,台風最接近前に丹後半島東部に生じた北上流や水温低下変動がほぼ再現されたことから,台風最接近前に丹後半島東部で発生した急潮は,主に風によって励起された沿岸ジェットであることが示された.</p>

<p>From recent mooring observations carried out along the coast of Tango Peninsula, we found that stormy current, Kyucho, rarely occurred before passage of Typhoon or midlatitude cyclone and damaged set-net around the peninsula. We examined the characteristics and generation mechanism of the Kyucho associated with the case of Typhoon 0514. Mooring current and temperature data obtained at the eastern part of the peninsula showed that the northward strong current (approximately 0.8 ms<sup>-1</sup>) accompanied with temperature decrease have developed before passage of the typhoon. The currents distributed with the coast on the left hand were extracted as the first EOF mode and its time variation was found to be crossly correlated with the westward wind at Mt. Taiko (at the center of the peninsula). From a numerical experiment using 3D level model with uniform stratification condition, the northward strong current and temperature decrease at the eastern part of the peninsula was well reproduced by forcing of the wind which was blowing more than two days before passage of Typhoon 0514. We concluded that the Kyucho occurred at eastern part of the peninsula before passage of Typhoon was due mainly to the coastal jet excited by continuously blowing strong westward wind.</p>

Journal

  • Oceanography in Japan

    Oceanography in Japan 21(6), 201-217, 2012-11-15

    The Oceanographic Society of Japan

References:  25

Codes

  • NII Article ID (NAID)
    110009562818
  • NII NACSIS-CAT ID (NCID)
    AN10382760
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    09168362
  • NDL Article ID
    024161812
  • NDL Call No.
    Z15-778
  • Data Source
    CJP  NDL  NII-ELS  J-STAGE 
Page Top