相模湾上層で観測された内部潮汐の特性

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Characteristic features of internal tides in the upper layer of Sagami Bay are investigated by carrying out observations at three stations, with a thermistor-chain at one station and current meters at other two stations during the period from late July to early October 1986. The existence of the internal tides throughout the observation period is confirmed from the temperature records obtained in the seasonal thermocline at all stations. The temperature fluctuation of semidiurnal period is dominant at all stations. Amplitude of the semidiurnal temperature fluctuations is largest at HY (near the western side of the bay head) and smallest at JO (off Jogashima of Miura Peninsula) throughout the observation period. The amplitude of the semidiurnal velocity fluctuations is larger at JO than at OK (over the bank off 18 km south of JO). The temperature fluctuations of semidiurnal period at HY are out of phase to those at OK. Phase difference between the sea level variations and temperature fluctuations of semidiurnal period is locked both at HY and OK, while that is changeable at JO. A numerical experiment with a simple rectangular bay model was carried out to explain the distributions of amplitude and phase of semidiurnal internal tide observed in Sagami Bay. The numerical model shows that the semidiurnal internal tide is reflecting at the bay head and interfering with incident internal tide. The experimental results agree approximately with observed results of the semidiurnal internal tide in Sagami Bay.
日本海洋学会の論文
1993-10-25

相模湾上層で観測された内部潮汐の特性

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