Vortex pairs formed by tidal currents in the Naruto Strait: effects of bottom topography, density stratification, and coastline geometry

Nakamura, Tomohiro; Yamaguchi, Takuya; Nakada, Satoshi; Matsumura, Yoshimasa

Vortex pairs formed by tidal currents in the Naruto Strait: effects of bottom topography, density stratification, and coastline geometry

Nakamura, Tomohiro; Yamaguchi, Takuya; Nakada, Satoshi et al.

Journal of oceanography, 2023, 80(2), 85-97

Permalink : https://hdl.handle.net/2115/93884

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論文情報

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アクセス権	open access
URI	https://hdl.handle.net/2115/93884
タイトル	Vortex pairs formed by tidal currents in the Naruto Strait: effects of bottom topography, density stratification, and coastline geometry
著者	Nakamura, Tomohiro ; Yamaguchi, Takuya ; Nakada, Satoshi ; Matsumura, Yoshimasa
e-Rad_Researcher 60400008 著者名 Nakamura, Tomohiro
著者名 Yamaguchi, Takuya
著者名 Nakada, Satoshi
著者名 Matsumura, Yoshimasa
言語	英語
キーワード	Vortex pair or vortex dipole
	Tidal flow
	Naruto Strait
	Bottom topography and coastline geometry
	Density stratification
	Strouhal number threshold
発行日	2023-12-27
出版者	Springer
収録物名	Journal of oceanography
巻(号)	80(2)
ページ	85-97
抄録	Vortex pairs formed at a strait outlet by tidal flow effectively induce water exchange and material transport in coastal areas. However, the effects of complex bottom topography and density stratification remain unclear. Here, we investigated the development and propagation of vortex pairs in the Naruto Strait, which has complex topography. Satellite observations indicated that the vortex pairs formed on the northern side of the strait continue to move away from the strait after the reversal of tidal flow, shifting their propagation from northward to westward. Numerical experiments revealed that: (1) changes in depth affect the propagation speed and overall size of vortex pairs; (2) density stratification reduces the effects of depth changes; (3) coastline geometry affects the propagation direction of vortex pairs. Furthermore, experiments with idealized topography showed that in a region where depth increases with vortex-pair propagation, the jet decelerates, and the vortex pair shrinks in size. Conversely, in a region where depth decreases, the jet widens, and the vortex pair expands. The changes in jet flow speed can be attributed to flow continuity and depth change, as the latter alters the cross-sectional area. Meanwhile, the changes in vortex pair size and jet width can be explained by vortex propagation on a slope due to potential vorticity conservation. These effects of topography and density stratification may also be significant in other coastal areas and potentially influence the Strouhal number threshold below which vortex pairs leave an outlet.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
権利情報	This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: https://doi.org/10.1007/s10872-023-00709-1
PISSN	0916-8370
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1007/s10872-023-00709-1