JAPANESE RES#ARCH IN PHYSICAL OCEANOGRAPHY ,19)8-1950 
Recent infomation prepared by Dr. Koji Hidaka, Geophysical Institute, 
Tokyo University, Tokyo, Japan, regarding oceanographic research in Japan 
during the period 198 to 1950, has come to the attention of the Beach Erosion 
Board. Dr. Hidaka indicates that research institutions in Japan which normally 
accomplish oceanographic work are rapidly recovering from their period of 
forced inactivity in this field brought about by World War II. Agencies of 
the Japanese Government which have been accomplishing a program of oceano- 
graphic observations under control of the Occupational Forces are specified 
as follows: 
1. The Hydrographic Office, Maritime Safety Agency, Tokyo. 
20 Seven Fisheries Research Laboratories located throughout Japan, 
including the one at Tokyo. 
3. The Central Meteorological Observatory at Tokyo, and subordinate 
Marine Observatories at Hakodate, Kob?, Maizuru and Nagasaki, 
with other lesser coastal meteorological stations. 
Organizations coordinating or publishing the results of the research are: 
(1) the Three Agency Marine Research Coordination Council, made up of re- 
presentatives from the agencies of the Japanese Government listed above; 
2) the National Committee on Geophysics, Section of Physical Oceanography 
which Dr. Hidaka heads as chairman; and (3) the Oceanographical Society of 
vapane 
Dr. Hidaka's description of Japanese research accomplished concerning 
waves, tides and related subject is presented in the following paragraphs. 
Kee KEE 
Waves in General. The studies of waves in general are active throughout 
the world now and many eminent accomplishments have been done in the United 
States, Great Britain, Germany and so forth n this country, investigations 
in the same field are also active. Tonga made an attempt to obtain 
the approximate solutions of the wave equation and their applications. He 
also Teo the reflection coefficients for tide-waves, tsunami and 
swell. (30 
In 1950 Kurihara and Teubaki (31) discussed the generation of roll waves 
in shallow, flat-bottomed channel, use being made of the theory of turbulence. 
Wind Waves and Swell. In 1950 Yoshida(32) published a theory of the 
period increase of waves in storm area. He also explains the surf beats as 
named by Munk in the same way as the overtides and compound tides are derived. 
Furthermore he suggests that their frequent occurrence may be ascribed 
to the general structure of the ocean-wave-spectrum. Ichie(33) discusses 
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