1,721,179 research outputs found
FUNDAMENTAL STUDY ON THE TIDAL RESIDUAL CIRCULATION (II)
No full textThe tidal residual circulation in a bay was experimentally investigated with use of asimplified hydraulic model. The tide with a period of 6 mm. Was provided by a plunger-type tide generator to a square bay of 5 x 5 m, 0. 1 m in depth, through an opening of 1 min width.The current in the bay always flows in one direction although the strength changesaccording to the phase. That is, the strong tidal residual circulation occurs. The vorticityadvection of the residual flow is balanced to the curl of the tide stress and the dissipationby the viscosity.The simultaneous flow pattern occurs under the almost same configration of the groundin she prototype.The tidal residual circulation in a bay was experimentally investigated with use of asimplified hydraulic model. The tide with a period of 6 mm. Was provided by a plunger-type tide generator to a square bay of 5 x 5 m, 0. 1 m in depth, through an opening of 1 min width.The current in the bay always flows in one direction although the strength changesaccording to the phase. That is, the strong tidal residual circulation occurs. The vorticityadvection of the residual flow is balanced to the curl of the tide stress and the dissipationby the viscosity.The simultaneous flow pattern occurs under the almost same configration of the groundin she prototype
DISPERSION OF MATERIAL IN THE COASTAL SEA (III)-Continuous Point Source Dye Experiment-
No full textThe continuous point source dye experiment was carried out to estimate the horizontal diffusivityin the Sea of Iyo, the Seto Inland Sea. The estimated Lagrangian horizontal diffusivity was 7.6-8.5x1O 3 cm2 s-1. The current measurement was carried out in the same time and the estimatedEulerian horizontal diffusivity was 2.7x10 4 cm2 s-1. This discrepancy suggests that the methodby HAY and PASQUILL (1959) can not be adapted to the alternative flow such as tidal current.The continuous point source dye experiment was carried out to estimate the horizontal diffusivityin the Sea of Iyo, the Seto Inland Sea. The estimated Lagrangian horizontal diffusivity was 7.6-8.5x1O 3 cm2 s-1. The current measurement was carried out in the same time and the estimatedEulerian horizontal diffusivity was 2.7x10 4 cm2 s-1. This discrepancy suggests that the methodby HAY and PASQUILL (1959) can not be adapted to the alternative flow such as tidal current
DISPERSION OF MATERIAL IN THE COASTAL SEA (I)-Instantaneous Point Source Dye Experiment-
No full textDye cloud in the coastal sea does not spread in a circular form but is elongated elliptically.This is due to the shear effect which comes from the coupling effect of the shear flow and the verti-cal diffusion. A method is proposed to separate the effect of shear and that of horizontal turbulentdiffusion. The horizontal turbulent diffusivity obtained by this method is 5x10 2 cm2/sec in thehorizontal scale of 50 m.Dye cloud in the coastal sea does not spread in a circular form but is elongated elliptically.This is due to the shear effect which comes from the coupling effect of the shear flow and the verti-cal diffusion. A method is proposed to separate the effect of shear and that of horizontal turbulentdiffusion. The horizontal turbulent diffusivity obtained by this method is 5x10 2 cm2/sec in thehorizontal scale of 50 m
DISPERSION OF MATERIAL IN THE COASTAL SEA-Vertical Structure of Tidal Current Ellipse-
No full textTidal current measurements were carried out at Stn. 9 in the northern part of Harima-Nada, Seto Inland Sea to investigate the vertical structure of tidal current ellipse. Observed verticalprofile of tidal current ellipse well coinsides with the calculated one which is obtained by solvingthe linear momentum equations of tidal current containing the Coriolis force and the verticaleddy viscosity. The dispersion coefficient tensor by tidal current is correctly estimated using suchvertical profile of tidal current ellipse.Tidal current measurements were carried out at Stn. 9 in the northern part of Harima-Nada,Seto Inland Sea to investigate the vertical structure of tidal current ellipse. Observed verticalprofile of tidal current ellipse well coinsides with the calculated one which is obtained by solvingthe linear momentum equations of tidal current containing the Coriolis force and the verticaleddy viscosity. The dispersion coefficient tensor by tidal current is correctly estimated using suchvertical profile of tidal current ellipse
LONG-PERIOD WAVE ALONG THE SAN-IN COAST
No full textThe shelf wave with the period of about five days were observed along the Sanin Coast. Thephase of sea level variation propagates from west to east with the Sanin coast to the right hand atthe speed of about 5.0 ms 1 as the 1st mode of the shelf wave. The phase of current velocityvariation similarly propagates from west to east at the speed of about 1.0 ms 1 as the 2nd mode ofthe shelf wave.The shelf wave with the period of about five days were observed along the Sanin Coast. Thephase of sea level variation propagates from west to east with the Sanin coast to the right hand atthe speed of about 5.0 ms 1 as the 1st mode of the shelf wave. The phase of current velocityvariation similarly propagates from west to east at the speed of about 1.0 ms 1 as the 2nd mode ofthe shelf wave
DISPERSION OF MATERIAL IN THE COASTAL SEA (II)-FLOATS DISPERSION EXPERIMENT-
No full textThe dispersion experiments with many floats are carried out to estimate the horizontaldiffusivity in the coastal sea. In order to analyze the result of floats dispersion experimentaccurately a method is proposed to separate the effect of shear flow from that of horizontalturbulent diffusion. The horizontal turbulent diffusivity obtained by this method is 5X10 2cm2 s-1 in the horizontal scale of 40m.The dispersion experiments with many floats are carried out to estimate the horizontaldiffusivity in the coastal sea. In order to analyze the result of floats dispersion experimentaccurately a method is proposed to separate the effect of shear flow from that of horizontalturbulent diffusion. The horizontal turbulent diffusivity obtained by this method is 5X10 2cm2 s-1 in the horizontal scale of 40m
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