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Volume 19 (1963 - 196･･･
- Issue 4 Pages 169-
- Issue 3 Pages 121-
- Issue 2 Pages 75-
- Issue 1 Pages 1-
Volume 19, Issue 4
Displaying 1-5 of 5 articles from this issue
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Yutaka NAGATA1964 Volume 19 Issue 4 Pages 169-181
Published: January 31, 1964
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSThe knowledge of the directional wave spectrum is essential in the problem of the wave-generating mechanism by wind and also in the problem of the wave forecasting. It is also important in nearshore oceanography or in coastal engineering because the directional wave properties relate closely to pattern of nearshore circulations, drift sand and so on. The author has measured the orbital wave motion with electromagnetic current meters and has studied on the directional wave properties and the deformation of waves in shoaling water in connection with his work on the movement of sediment. In this paper, the statistical properties of the orbital wave motion are discussed and the methods of obtaining the directional wave spectrum from continuous records of two horizontal components of the orbital wave velocity are proposed. The records of two horizontal velocity components and the pressure fluctuation give the same amount of information as the records of surface elevation and two components of surface gradient. In other words, it is possible to obtain the first five Fourier coefficients of directional wave spectrum with respect to θ. Several simple methods for conducting routine observations are proposed.View full abstractDownload PDF (1725K) -
Naoji ITO1964 Volume 19 Issue 4 Pages 182-186
Published: January 31, 1964
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSSeveral small-scale dye-release experiments, which were carried out off Tokaimura by Japan Atomic Energy Research Institute and other research institutes, are described. The results showed that the diffusion constant defined in this paper was approximately fitted in all the experiments performed and the horizontal concentration distribution of released material could be estimated, using the constant. These may be applicable in the problem of environmental safety around atomic establishments.View full abstractDownload PDF (569K) -
Yatsuka SAIJO1964 Volume 19 Issue 4 Pages 187-189
Published: January 31, 1964
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSThe size distribution of photosynthesizing phytoplankton was estimated at 7 stations in the Indian Ocean for the waters at the surface as well as at 50m depth. Four light bottles filled with the same sample water were incubated under light source after adding 14C solution, and then filtered through XX13 net, Millipore HA, AA, SM filter respectively. The photosynthetic activities of each fraction were evaluated from the results of counting for each filter. The activity of organisms retained by net is only a small part of total activity whereas the phytoplankton with the size between 0.8 and 110μ play the most part of the activity. The smallest size fraction with the size smaller than 0.8μ has a considerable activity for the surface water, but is almost negligible for the water from 50m depth.View full abstractDownload PDF (466K) -
Yatsuka SAIJO, Takuji KAWASHIMA1964 Volume 19 Issue 4 Pages 190-196
Published: January 31, 1964
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSStudies on primary production were made in the Antarctic Ocean, between 40°W and 100°E, during December 1961 to February 1962. At ten stations, chlorophyll-a and photosynthetic rate were determined for sample waters from surface as well as the depth of Secchi disk reading, and at other 35 stations only chlorophyll-a in surface water was determined. At most of the stations the chlorophyll-a contents were very low (i.e. 0.02 to 0.22 mg/m3) except at a few stations where higher values, (i.e. 0.3-0.6 g/m3) were obtained. The photosynthetic rates determined by 14C technique under the optimum light ranged from 0.06 to 0.80 mg C/m3/ hr, and the mean value of photosynthesis per unit amount of chlorophyll was 1.22 mg C/mg chl./hr. The daily primary production beneath a unit surface, calculated from the above results and light data were ranged from 0.01 to 0.15 g C/m2/day. After consideration about the high concentration of nutrients in the sample waters and rather plenty incident radiation during this period, it was concluded that such low values of primary production in the Antarctic Ocean might be caused by the near freezing water temperature and deep mixing layer in that area.View full abstractDownload PDF (1101K) -
[in Japanese]1964 Volume 19 Issue 4 Pages 200-206
Published: January 31, 1964
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSDownload PDF (1182K)
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