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Continental shelf waves off the fukushima coast Part I: Observations |
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| Authors: | Masahisa Kubota Kisaburo Nakata Yoshiharu Nakamura |
| Affiliation: | (1) Geophysical Institute, University of Tokyo, Bunkyô-ku, 113 Tokyo, Japan;(2) Present address: School of Marine Science and Technology, Tokai University, Shimizu-shi, 424 Shizuoka, Japan;(3) National Research Institute for Pollution and Resources, Onogawa, Yatabe-machi, Tsukubagun, 300-32 Ibaraki, Japan;(4) Fukushima Prefectural Fisheries Experimental Station, Onahama, Iwaki-shi, 971 Fukushima, Japan |
| Abstract: | Current records obtained in the inshore region along the Fukushima coast are analyzed. The existence of periodical current fluctuations whose period is about 100 hours and whose amplitude is as large as 15–25cm s–1 is recognized. Auto-spectral analyses are made also for sea level, atmospheric pressure and wind records. Each spectrum has significant peaks at the similar period to the current spectrum. The wind spectrum has a broad peak compared with the current. The periodical current fluctuations propagate southward with speed of 3–5 km h–1. These propagation speeds seem to correspond to those of the second-and third-mode shelf waves. |
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