TRANSPORT PROCESSES AROUND THE IZU-CHAIN ISLANDS INVESTIGATED WITH A LAGRANGIAN PARTICLE TRACKING MODEL
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- KIMURA Waku
- 茨城大学 大学院理工学研究科都市システム工学専攻
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- MASUNAGA Eiji
- 茨城大学 広域水圏環境科学教育研究センター
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- KOSAKO Taichi
- 国立研究開発法人海上・港湾・航空技術研究所 港湾空港技術研究所 沿岸土砂管理研究グループ
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- UCHIYAMA Yusuke
- 神戸大学 大学院工学研究科市民工学専攻
Bibliographic Information
- Other Title
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- Lagrange粒子追跡モデルを用いた伊豆諸島周辺海域の物質輸送及び拡散の評価
- Lagrange リュウシ ツイセキ モデル オ モチイタ イズ ショトウ シュウヘン カイイキ ノ ブッシツ ユソウ オヨビ カクサン ノ ヒョウカ
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Abstract
<p> This study investigated mass transport and dispersion around Izu-chain islands off the Japan mainland using 3-D Lagrangian particle tracking simulations modeled in a high-resolution reginal ocean modeling system (ROMS). The Kuroshio, eddies and tides largely influence physical processes in the study area. Details of transport processes involving the Kuroshio, eddies and tides have not been understood well. However, these processes are important for understanding oceanic environments and ecosystems in the North Pacific Ocean. The vorticity is enhanced by the tidal forcing in the whole study area. The tidal forcing enhances the horizontal diffusion of particles within a two-days scale. By contrast, in the longer time scale than two days, the dispersion of particles is suppressed by the tidal forcing, because large scale motions are suppressed by tides. The frequency spectrum of the particle velocity shows semi-diurnal peaks and high frequency (low frequency) is enhanced (decreased) by the tidal forcing. The tidal forcing promotes high frequency and sub-mesoscale eddies and suppresses low frequency and large scale motions.</p>
Journal
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- Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)
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Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 75 (2), I_211-I_216, 2019
Japan Society of Civil Engineers