open access

https://doi.org/10.14943/bull.fish.73.1.15

https://hdl.handle.net/2115/90249

Island-shaded Vortex Sequence formed behind the Elliptical Island, Assuming Okushiri Island

日本語

reduced gravity model

2023-08-04

北海道大学大学院水産科学研究院

Bulletin of Fisheries Sciences, Hokkaido University

73(1)

15-26

In this study, ADCP observations were carried out on a grid of ship routes with the expectation that the island-shaded vortex would be captured around Okushiri Island in summer. Although such snapshot observation did not reveal the vortex’s generation period, anti-clockwise vortex flows were indeed observed on the eastern side of the island, and a northward migration of its vortex was also inferred. The observed vortex could be easily reproduced by a reduced gravity model with an idealized elliptical island set up in the northward flow. The model experiments have newly shown the occurrence of alternating positive and negative vortices with two-periodicities, i.e., 2.7 days and its double cycle 5.4 days.

紀要論文

Version of Record

2435-3353