Journal of the Oceanographical Society of Japan
Online ISSN : 2186-3113
Print ISSN : 0029-8131
ISSN-L : 0029-8131
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Volume 37, Issue 2
Displaying 1-4 of 4 articles from this issue
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  • Numerical Computations of the Storm Surges in Tosa Bay
    Takeo UENO
    1981 Volume 37 Issue 2 Pages 61-73
    Published: July 30, 1981
    Released on J-STAGE: June 17, 2011
    DOIhttps://doi.org/10.1007/BF02072559
    JOURNAL FREE ACCESS
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    The storm surges which occurred in Tosa Bay in August 21, 1970 were numerically simulated. First of all NOAA's model “SPLASH” (Special Program to List Amplitudes of Surges from Hurricanes) was used and the effects of the typhoon's parameters, the bottom topography, the coastal configuration and the coordinate systems of storm surges were examined. “SPLASH” was then modified to suit computations of storm surges in the open sea and open boundary conditions were studied. Finally a two layer model was developed and the effects of the two layer system on surges were investigated.
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  • Tide-induced Vertical Circulation in a Bay with Homogeneous Water: Theory and Experiment
    Hidekazu YASUDA
    1981 Volume 37 Issue 2 Pages 74-86
    Published: July 30, 1981
    Released on J-STAGE: June 17, 2011
    DOIhttps://doi.org/10.1007/BF02072560
    JOURNAL FREE ACCESS
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    The structure of the tidal residual current due to vertical viscosity is investigated both theoretically and experimentally. It is found that the interaction between the vertical component of the oscillatory current and vorticity, ωTξ1T1, induces a strong residual constituent outside the boundary layer and forms a circulation which is quite similar to gravitational circulation and that the vertical profile of the oscillatory current not only affects the magnitude of the residual constituent but also decides the direction of the circulation. In the hydraulic experiment, the residual constituent is larger than the theoretical prediction and a phase difference in the oscillatory constituent between the upper and lower layer is observed. The amplitude difference is caused by the strong nonlinear effect of the residual constituent and the phase difference is caused by the interaction between the residual current and the basic oscillatory current. The principal generating force of the residual constituent outside the boundary layer, ωT1ξT1, is observed in a bay where the tide is nearly a standing wave.
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  • Velocity Variation of the Kuroshio during Formation of the Small Meander South of Kyûshû
    Yoshihiko SEKINE, Yoshiaki TOBA
    1981 Volume 37 Issue 2 Pages 87-93
    Published: July 30, 1981
    Released on J-STAGE: June 17, 2011
    DOIhttps://doi.org/10.1007/BF02072561
    JOURNAL FREE ACCESS
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    Historical GEK data provided by JODC is analyzed to investigate the characteristic variation in velocity of the Kuroshio, with special reference to the formation of small meanders south of Kyoshu. It is found that, during or prior to the period of small meander formation, there is a tendency for an abrupt increase in the current velocity west of Yaku-Shima (Yaku-Island), representing an increase in the main current intensity upstream. Also, there are apparent time lags in the variation in current velocity along the path of the Kuroshio between the upstream and the downstream regions of the small meander area. Namely, it is apparent that the increase in Kuroshio velocity in the Satsunan Strait procedes that offshore of Shikoku during the period of the small meander formation, by the order of one month. These results indicate that a nonlinear effect due to the increase in current velocity is a possible cause of the generation of small meanders.
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  • Observation of the Bottom Boundary Layer on the Continental Shelf
    Kisaburo NAKATA
    1981 Volume 37 Issue 2 Pages 94-99
    Published: July 30, 1981
    Released on J-STAGE: June 17, 2011
    DOIhttps://doi.org/10.1007/BF02072562
    JOURNAL FREE ACCESS
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    Current meter data from various depths near the sea bottom collected for 31 days at time intervals of 10 minutes using a subsurface buoy system at a depth at 38 m on the continental shelf off Akita, Japan have been analyzed. The results show the existence of a stationary Ekman layer. The typical range of the characteristic parameters are estimated as follows;
    friction velocity: 0.38cm s-1; Ekman layer thickness: 16m; logarithmic layer thickness: 4m-6m; constant flux layer thickness: 0.4-0.6m; Ekman veering: 28.7°; drag coefficient: 0.24×10-2-0.53×10-2
    Veering was also observed in the logarithmic layer.
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