Deep sea current in the dumping area for industrial waste off Sanriku district.
To examine the magnitude of deep sea current in the dumping areas which is designated for industrial waste by law, a continuous measurement for twelve days was done in one of these areas (40°09'.3 N, 145°21'.l E) from July to August 1975. A rotor-type current meter with magnetic recording was installed, with an acoustic release system, 80 meters above the sea bed where the water depth was 5270 meters. The obtained current velocities were distributed between 8 and 20 cm/sec and the current directions between 355° and 38°. Simple average of all the data gave mean current of 13. 3 cm/sec in velocity and 14. 7° in direction. The north component of mean current is 13 cm/sec and is four times higher than the east component (3 cm/sec). Variations of the current which have longer periods such as 11. 6, 5. 8 and 3. 9 days were noticed from the Fourier analysis of the data series. Fairly remarkable changes of tidal period such as 12 and 25 hours were found only for the north component after examination of their self-correlations.
| Main Authors: | , , , |
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| Format: | Journal Contribution biblioteca |
| Language: | Japanese |
| Published: |
1977
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| Online Access: | http://hdl.handle.net/1834/16329 |
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