A Current Meter Using a Phototube (III)

Abstract

The author observed a tidal current ' ,using his current meter [11 and two others of different kinds simultaneously . He explained that the observed velocity fluctuation with the period of 1 .5 hours was caused by the instantaneous penetration of the waters broken from the disturbance, and the time variation of velocity was due to the effect of vertical eddy viscosity and the change of the surface slope with time . Further. he analysed the shorter period disturbance and found that its eddy diffusion coefficient K-269 c.g.s, its mean length of edddy /-12.1 cm .

On the Structure of Ocean Currents (II)

“…The observations were made in Uraga strait on board the research ship " Asasio Maru " . The station was shown in the previous paper [1], and the predicted tide at Mera is shown in Table 1. Fig.…”

A Current Meter Using a Phototube (II) - Experiment on a Wind Drift Current in a Rising Slate -

“…We must also add this value to the results obtained in the previous paper [1]. Adding this correction to the values calculated from Fig.…”

“…2. As mentioned in the previous paper [1], the speed calibration observations with the Ekman-Merz and the author's current meters was done, and the result is shown in Fig. 3.…”

A Suppimentary Note to the Previous Paper “A Theory of the Mechanism of the Generation of the Cold Water Region in the Offing of Enshûnada ”

“…Usually observers have seen by experience that weaker currents are apt to vary much in direction than strong currents, and that the latter do not fluctuate in their directions easily (NAN'NITI 1954, 1958. Now take the x-coordinate to cross-stream, then the variation of direction 0 may be given by O=tan-1 u/ V+v where V is mean velocity and u, v are the x-and y-components of fluctuations respectively due to the perturbation dV.…”