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北海道大学水産科学研究彙報 = Bulletin of Fisheries Sciences, Hokkaido University >
第66巻 第3号 >


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Title: 宗谷暖流域における反時計回り非線形渦流列の励起機構
Other Titles: Generation Mechanism of the Anti-clockwise Nonlinear Eddy Street in the Region of the Soya Warm Current
Authors: 伊田, 智喜 Browse this author
有田, 駿 Browse this author
磯田, 豊 Browse this author →KAKEN DB
Keywords: Soya Warm Current
anti-clockwise nonlinear eddy street
conservation of potential vorticity
self-excited oscillation
Issue Date: 27-Dec-2016
Publisher: 北海道大学大学院水産科学研究院
Journal Title: 北海道大学水産科学研究彙報
Volume: 66
Issue: 3
Start Page: 99
End Page: 114
Abstract: The generation mechanism of anti-clockwise nonlinear eddy street along the Soya Warm Current is examined using the inflow-forced numerical model incorporating the simple shelf-slope topography. According to the conservation of potential vorticity, a strong positive vorticity is produced off the inflow entrance by vortex stretching as the water column is pushed out to deeper offshore. It rapidly grows up an isolated anti-clockwise circular eddy, i.e., a nonlinear eddy, during advection time traveling round the eddy. Therefore, this advection time controls the oscillated period, and each isolated eddy is periodically generated and stably advected downstream by the mean shear-flow. Such flow system accompanied by the eddy street is interpreted as the self-excited oscillation.
Type: bulletin (article)
Appears in Collections:北海道大学水産科学研究彙報 = Bulletin of Fisheries Sciences, Hokkaido University > 第66巻 第3号

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