Continental shelf waves off the Fukushima coast |
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| Authors: | Masahisa Kubota |
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| Institution: | (1) Geophysical Institute, University of Tokyo, Bunkyo-ku, 113 Tokyo, Japan;(2) Present address: School of Marine Science and Technology, Tokai University, Shimizu-shi, 424 Shizuoka, Japan |
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| Abstract: | Numerical experiments are performed on shelf waves forced by wind stress with a spectral peak around a period of 100 hr. Water depth in the numerical model is a function of offshore distance only and resembles a bathymetric profile off the Fukushima coast. A pair of vortices alined in the offshore direction and a large vortex are reproduced and they propagate southward outside the forced region. Judging from the propagation speed, the former corresponds to the second-mode and the latter to the first-mode shelf waves. In the forced region, the propagation speed of a trough and a ridge is slow, 3–5km hr–1. These propagation characteristics reproduce those observed along the Fukushima coast and this propagation speed corresponds to that of second-and third-mode shelf waves. Thus, it is concluded that the periodical current fluctuations observed in the inshore region along the Fukushima coast are due to motions associated with the second-and third-mode shelf waves. |
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