奥尻島を想定した楕円島後流域の島陰渦列
藤居, 流;磯田, 豊;小林, 直人
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http://hdl.handle.net/2115/90249
JaLCDOI : 10.14943/bull.fish.73.1.15
KEYWORDS : island-shaded vortex; Okushiri Island; elliptical island; reduced gravity model
Abstract
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.
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