駿河湾の湾口海域における流動変動

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  • Current variation in the sea near the mouth of Suruga Bay.

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In order to investigate the circulation pattern and the characteristics of tidal currents in the sea near the mouth of Suruga Bay, current measurements were conducted at two stations at near-surface levels during the warm months of the year (late May to early October). The mean currents at the eastern and western stations are inversely correlated with each other: when inflow occurs at the eastern station outflow occurs at the western one and vice versa. The circulation pattern, therefore, can be determined from the mean current at either station, e. g., inflow or outflow at the eastern station corresponds to counterclockwise and clockwise circulation, respectively. The predominant tidal constituents of the measured currents are diurnal while those of the sea level along the bay are semidiurnal. The amplitudes of the diurnal constituents of the current show clear long-term variations besides the semimonthly variation corresponding to the phase of the moon.<BR>Variation in the path of the Kuroshio off the bay mouth seems to influence not only the circulation pattern but also the tidal currents in the sea near the bay mouth. When the Kuroshio axis is to the north of Zenisu, a shoal off the eastern side of the bay, the circulation pattern is counterclockwise and the amplitude of the tidal current is small. On the other hand, when the Kuroshio is to the south of Zenisu, the circulation pattern is weakly clockwise or stagnant and the amplitude of the tidal current is large.

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