Fisheries and Aquatic Sciences

한국수산과학회 (The Korean Society of Fisheries and Aquatic Science)
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Hydraulic Model Experiment on the Circulation in Sagami Bay, Japan (II) - Dependence of the Circulation Pattern on External and Internal Rossby Number in Baroclinic Rotating Model

  • 발행 : 2002.03.01
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초록

To investigate the effect of mechanical parameters on the circulation and its fluctuation in Sagami Bay, baroclinic model experiments were carried out by use of a two-layer source-sink flow in a rotating tank. In the experiment, a simple coastal topography with flat bottom was reproduced. The results show that the path of the Through Flow, which corresponds to the branch current of the Kuroshio, depends on external Rossby number (Ro) and internal Rossby number $(Ro^*)$, and divided into two regimes. For $Ro^*\leq1.0$ in which Rossby internal radius of deformation of the Through Flow is smaller than the width of the approaching channel, the current flows along the Oshima Island as a coastal boundary density current separated from the western boundary of the channel. For $Ro^*>1.0$ it changes to a jet flow along the western boundary of the channel, separated from the coast of Oshima Island. The current is independent on both Ro and Ro* in the regime of $Ro^*>1.0,\;Ro\geq0.06$ and $Ro^*\leq1.0,\;Ro\geq0.06$. The pattern of the cyclonic circulation in the inner part of the bay is also determined by Ro and Ro*. In case of $Ro^*\leq1.0$, frontal eddies are formed in the northern boundary of the Through Flow. These frontal eddies intrude into the inner part along the eastern boundary of the bay providing vorticity to form and maintain the inner cyclonic circulation. For $Ro^*>1.0$, the wakes from the Izu peninsula are superposed intensifying the cyclonic circulation. The pattern of the cyclonic circulation is divided into three types; 1) weak cyclonic circulation and the inner anticyclonic circulation $(Ro<0.12)$. 2) cyclonic circulation in the bay $(0.12\leq Ro<0.25)$. 3) cyclonic circulation with strong boundary current $(RO\geq0.25)$.

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참고문헌

  1. Awaji, T., K. Akimoto and N. Imasato. 1991. Numerical study of self water motion driven by the Kuroshio: Barotropic model. J. Phys. Ocenogr., 21, 11-27 https://doi.org/10.1175/1520-0485(1991)021<0011:NSOSWM>2.0.CO;2
  2. Baines, P.G. and P.A. Davis. 1980. Laboratory studies of Poto-graphic effects in rotating and/or stratified fluids. In Orographic Effects in Planetary Flows, R. Hide and P. White, eds. GARP Publ. Ser., 23, PP. 233-299
  3. Brooks, D.A. and J.M. Bane. 1983. Gulf Stream meanders off North Carolina during winter and summer 1979. J. Geo-phys. Res., 88, 4633-4650 https://doi.org/10.1029/JC088iC08p04633
  4. Chia, F., R.W. Griffiths and P.F. Linden. 1982. Laboratory experiments of fronts. Part 2: The formation of cyclonic eddies at upwelling fronts. Geophys. Astrophys. Fluid Dynam., 19, 189-206 https://doi.org/10.1080/03091928208208955
  5. Choo, H.S. 1992. Studies on the Mechanics of Circulation and Its Fluctuation in Sagami Bay. Doctonal Dissertation, University of Tokyo, PP. 19-20
  6. Choo, H.S. and T. Sugimoto. 1992. Hydraulic model experiment on the circulation in Sagami Bay (l) -Dependency of the circulation pattern on Reynolds and Rossby Numbers in Barotropic rotating model-. Bulletin on Coastal Oceanography, 29, 179-189 (in Japanese)
  7. Choo, H.S. and T. Sugimoto. 1999. Hydraulic model experi-ment on the circulation in Sagami Bay, Japan (IV) -The time-varing states of the flow pattem and water exchange in baroclinic rotating model-. Environmental Sciences, 3,57-n https://doi.org/10.1080/15693430500481295
  8. Griffith, R.W. and P.F. Linden. 1982. Laboratory experiments on fronts. Part 1: Density driven boundary current. Geophys. Astrophys. Fluid Dynam., 19, 159-187 https://doi.org/10.1080/03091928208208954
  9. Hasunuma, K., H. Nakada, H. Nagae and T. Hirano. 1983. Surface circulation and its fluctuation in Sagami Bay. Abstracts of Aut. Con. of Japan J. Oceanogr. 1983, PP. 13-14 (in Japanese)
  10. Iwata, S. 1979. Mean oceanic condition in Sagami Bay. Observational Report of Fisheries Environment in Sagami Bay-2, Kanagawa Prefectural Fishery Experimental Station, PP. 15-25 (in Japanese)
  11. Iwata, S. 1986. Studies on the short-term variations of oceanic conditions in Sagami Bay. Special Rep. of the KanagawaPrefectural Fishery Experimental Station, 3, PP. 1-64 (in Japanese)
  12. Iwata, S. and M. Matsuyama. 1989. Surface circulation in Sagami Bay: The response to variations of the Kuroshio axis. J. Oceanogr. Soc. Japan, 45, 310-320 https://doi.org/10.1007/BF02123485
  13. Kawasaki, Y. and T. Sugimoto. 1984. Experimental studies on the formation and degeneration processes of the Tsugaru Warm Gyre. In Ocean Hydrodynamics of the Japan and East China Seas, T. Ichiye, ed. Elsevier Sci. Publ., Ams-terdam, pp. 225-238
  14. Kawasaki, Y. and T. Sugimoto. 1988. A laboratory study of the short-term vahation of the outflow pattern of the Tsugaru Warm Water with a change in its volume transport. Bull. Tohoku Reg. Fish. Res. Lab., 50, 203-215 (in Japanese)
  15. Kawata, K. and N. Iwata. 1957. Currents in Sagami Wan. Hydrographic Bulletin, Maritime Safety Board, Tokyo, Japan, 53, 44-47 (in Japanese)
  16. Kimura, K. 1942. Kyucho event in coastal areas. Tech. Rep. of the Central Meteorological Observatory of Japan, 19, 1-85 (in Japanese)
  17. Kubokawa, A. and K. Hanawa. 1984. A theory of Semigeos-trophic gravity waves and its application to the intrusion of a density current along a coast. Part 2. Intrusion of a density current along a coast in a rotating Quid. J. Oceanogr. Soc. Japan, 40, 260-270 https://doi.org/10.1007/BF02302519
  18. Lee, T.N., L.P. Atkinson and R. Legeckis. 1981. Observations of a Gulf Stream frontal eddy on the Georgia Continental shelf, April 1977. Deep-Sea Res., 4, 347-378
  19. Lee, T.N. and L.P. Atkinson. 1983. 'Low frequency current and temperature variability from Gulf Stream frontal eddies and atmospheric forcing along the southeast U.S outer continental shelf. J. Geophys. Res., 88, 4541-4567 https://doi.org/10.1029/JC088iC08p04541
  20. Momoi, K.1976. Statistical Studies on the Surface Current in Sagami Bay and Zunan Coastal Areas. Graduation Thesis, Tokai Univ., 112pp. (in Japanese)
  21. Nakada, H., K. Hasunuma and T. Hirano. 1989. Distribution of sardine eggs and larvae related to the surface Circulation in Sagami Bay. J. Oceanogr. Soc. Japan, 45, 11-23 https://doi.org/10.1007/BF02108791
  22. Nishimura, T., Y. Hatakeyama, S. Tanaka and T. Maruyasu. 1984. Kinetic study of self-propelled marine vortices based on remotely sensed data. In Remote Sensing of Self Sea Hydrodynamics, J.C.J. Nihoul, ed. Elsevier Oceano-graphy Series, Amsterdam, 38, 69-105
  23. Nof, D. 1978. On geostrophic adjustments in sea straits and wide estuaries: Theory and laboratory experiments. Part 2: Two-layer system. J. Phys. Oceanogr., 8, 861-872 https://doi.org/10.1175/1520-0485(1978)008<0861:OGAISS>2.0.CO;2
  24. Odamaki, M. 1991. Currents in Sagami Bay as one of the sea bottom environment. KAIYO MONTHLY, 23, 418-423 (in Japanese)
  25. Orlanski, I. 1968. Instability of frontal waves. J. Atmos. Sci., 25, 178-200 https://doi.org/10.1175/1520-0469(1968)025<0178:IOFW>2.0.CO;2
  26. Stern, M.E., J.. Whitehead and B.-L. Hua. 1982. The intrusion of a density current along a coast of a rotating flid. J. Fluid Mech., 123, 237-265 https://doi.org/10.1017/S0022112082003048
  27. Stern .E. 1985. Lateral wave breaking and shingle fonnation in large scale shear flow. J. Phys. Oceanogr., 15, 1274-1283 https://doi.org/10.1175/1520-0485(1985)015<1274:LWBAFI>2.0.CO;2
  28. Stern, M.E. and L.J. Pratt. 1985. Dynamics of vorticity fronts. J. Fluid Mech., 161, 513-532 https://doi.org/10.1017/S0022112085003032
  29. Sugimoto, T. 1977. Physical oceanographical structure of the coastal boundary region of the Kuroshio. Monthly Marine Science, 9, 188-193 (in Japanese)
  30. Taira, K. and T. Teramoto. 1986. Path and volume transport of the Kuroshio current in Sagami Bay and their relationship to cold water masses near Izu Peninsula. J. Oceanogr. Soc. Japan, 42, 212-223 https://doi.org/10.1007/BF02109355
  31. Taira, K., T. Teramoto and K. Takeuchi. 1987. Centrifugal forces estimated from trajectories of drifting buoys in winding paths of the Kuroshio. J. Oceanogr. Soc. Japan, 43, 104-110 https://doi.org/10.1007/BF02111886
  32. Tameishi, H. 1988. Fisheries of Saury and oceanic condition in Sagami Bay. Bull. Japan Soc. Fish. Oceanogr., 52, 319-323 (in Japanese)
  33. Teramoto, T. 1965. Day-to-day to Monthly Variations in Oceanic Flows Estimated from Cross-stream DifFerences in Electric Potential. Doctorial Dissertation, Univ. of Tokyo, 74pp
  34. Uda, M. 1937. The relation of meteorological and oceanic condition to fishery in Sagami Bay in the fishing season of Yellowtail. Res. Rep. of Fishery Experimental Station, 8, 1-59 (in Japanese)
  35. Vinger, A. and TA. McClimans. 1980. Laboratory studies of baroclinic coastal currents along a straiaht, vertical Coast-line. River and Harbour Laboratory Report, STF60 A80 081, 1-15
  36. Whitehead, J.A. and A.R. Miller. 1979. Laboratory simulation of the gyre in the Alboran Sea. J. Geophys. Res., 84, 3733-3742 https://doi.org/10.1029/JC084iC07p03733
  37. Yoshida, S. 1960. On the short period variation of the Kuro-shio in the adjacent sea of Izu Islands. Hydrographic Bulletin, Maritime Safety Board, Tokyo, Japan, 65, 1-8 (in Japanese)