学術雑誌論文 能登半島東岸で2004年秋季に観測された大規模強流反復現象
Large-scale periodic strong currents off the eastern coast of the Noto Peninsula observed in autumn 2004

大慶, 則之  ,  奥野, 充一  ,  辻, 俊宏  ,  千手, 智晴  ,  Noriyuki, Okei  ,  Junichi, Okuno  ,  Toshihiro, Tsuji  ,  Tomoharu, Senjyu  ,  石川県水産総合センター  ,  石川県水産総合センター  ,  石川県水産総合センター  ,  九州大学応用力学研究所  ,  Ishikawa Prefecture Fisheries Research Center  ,  Ishikawa Prefecture Fisheries Research Center  ,  Ishikawa Prefecture Fisheries Research Center  ,  Research Institute for Applied Mechanics, Kyushu University

24 ( 4 )  , pp.133 - 146 , 2015-07-15
ISSN:21863105
NII書誌ID(NCID):AN10382760
内容記述
3つの台風が日本海上を相次いで通過した2004年秋季に能登半島東岸では大きな振幅を持つ周期的な流速変動が約1ヶ月間にわたって続いた。特に,台風0418号通過後の10日間の流速は,19.0~19.5時間の周期,50cm s^<-1>以上の振幅で変動した。この流速変動は半島東岸を北から南に伝播していた。水位と各層の水温は流速と同じ位相で変化し,南下流(北上流)時に上昇・昇温(下降・降温)していた。また,変動の卓越周期は各観測点の慣性周期に近く,1周期の間の流向の時間変化は時計回りであった。本論文では,半島東岸北部の変動には沖合で発生した近慣性内部重力波に起因する沿岸捕捉波の伝播のみが寄与しているが,半島東岸南部の変動には沿岸捕捉波の伝播のみならず富山湾から入射する回折波の寄与が大きいことを示す。また,連続して通過した台風により生じた近慣性周期運動が重なり合って,広い範囲で振幅が大きくなったことを示す。
Three typhoons successively passed the Noto Peninsula over a period of approximately one month in autumn 2004, and the strong currents produced by the typhoons periodically attacked the eastern coast of the peninsula. The current records for 10 days following the passage of Typhoon 0418 showed notable periodic variations with amplitudes exceeding 50 cm s^<-1> and periods of 19.0-19.5 hours. The periodic current variations were observed to propagate from the north to the south along the eastern coast of the peninsula. The southward (northward) currents were accompanied by an increase (decrease) in the subsurface temperature and by sea level anomalies at the observation sites. All of the predominant periods of current, temperature, and sea level variations approximated the inertial periods at the observation sites, and the current vectors completed one clockwise rotation during one period. This study shows that the periodic current variations in the vicinity of the northern part of the peninsula are caused by the propagation of coastal trapped waves derived from near-inertial internal waves in the offshore area, whereas those in the vicinity of the southern part of the peninsula are caused by the direct incident of diffracted waves from Toyama Bay. The large-scale near-inertial motions with large amplitudes can be attributed to the superposition of near-inertial waves caused by each of the successive three typhoons.
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