Circulation pattern and current variations with respect to tidal frequency in the sea near the head of Suruga Bay
Tóm tắt
Current measurements were conducted 10 m below the sea surface near the head of Suruga Bay intermittently from 1970 to 1978. The circulation pattern is usually counterclockwise; northward along the east coast (off Heda and at the mouth of Uchiura Inlet), westward along the north coast (off Fuji), and southwestward along the west coast (off Shimizu). The amplitudes of the four major tidal constituents of current variation, M2, S2, K1 and O1, are much larger than those expected from sea level variations along the coast. The amplitudes of the diurnal constituents of current variation are much larger than those of the semidiurnal constituents, while the amplitudes of the semidiurnal constituents of sea level variation are much larger than those of the diurnal constituents. The observed amplitude of the predominant diurnal constituents exhibit large seasonal changes and tend to increase with the development of the stratification of the upper part of the water in Suruga Bay. These facts strongly suggest that the observed current variations are mainly associated with internal tides in Suruga Bay.
Tài liệu tham khảo
Anonymous (1980): Tide Tables, 1981. Vol. 1, Japan Marine Safety Agency. 292 pp.
Japan Fisheries Agency (1978): The results of fisheries oceanographical observation, January–December 1973. Department of Research and Development, Japan Fisheries Agency, Tokyo, 1169 pp.
Japan Fisheries Agency (1980): The results of fisheries oceanographical observation, January–December 1975. Department of Research, Japan Fisheries Agency, Tokyo, 1023 pp.
Kimura, K. (1942): On the coastal stormy current “Dai-Kyucho”. Mem. Cen. Meteor. Observ.,19, 1–85. (in Japanese).
Kimura, K. (1950): Investigation of ocean current by drift-bottle experiments (No. 1)—Current in Suruga Bay with special reference to its anti-clockwise circulation within the bay. J. Oceanogr. Soc. Japan,5, 70–83. (in Japanese with English abstract).
Matsuyama, M. (1976): Internal tides in Uchiura Bay. J. Tokyo Univ. Fish.,62, 113–118. (in Japanese with English abstract).
Matsuyama, M. andT. Teramoto (1979): Numerical study of internal tides in Utiura Bay. J. Tokyo Univ. Fish.,65, 77–89.
Nakamura, Y. (1972): Hydrographic studies in Suruga Bay, II—The flowing at the surface in the inner part. Bull. Coastal Oceanogr.,9, 44–53. (in Japanese).
Nakamura, Y. andF. Muranaka (1979): Temporal fluctuation of oceanographic structure in Suruga Bay and Enshu-nada. Bull. Japan. Soc. Fish. Oceanogr.,34, 128–133. (in Japanese).
Sato, K. (1967): On the sea conditions in Suruga Bay. Maritime Safety Agency, Hydrogr. Dept., Tokyo, 124 pp. (mimeograph) (in Japanese).
Wunsch, C. (1975): Internal tides in the ocean. Rev. Geophys. Space Phys.,13, 167–182.