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Volume 30, Issue 1
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Shuji NAKABAYASHI1968 Volume 30 Issue 1 Pages 1-6
Published: January 30, 1968
Released on J-STAGE: July 23, 2009
JOURNAL FREE ACCESSIn every February from 1964 to 1967 the patrol ship Soya of the Japanese Maritime Safety Agency conducted oceanographic and ice observations in the southeastern part of Okhotsk Sea. The emphasis is laid on the results of 1964 to 1967.
A large water area bounded by the southern ice edge and Chishima Retto (Kuril Islands) was observed every year. Discussions are given to the vicissitude of this water area in relation with meteorological and oceanographical conditions, especially with the influence of warm Pacific water intruding into the Southern Okhotsk Sea.View full abstractDownload PDF (889K) -
Masao KUSAKABE1968 Volume 30 Issue 1 Pages 7-18
Published: January 30, 1968
Released on J-STAGE: July 23, 2009
JOURNAL FREE ACCESSThe date of the first and the last snowfalls, the number of days of snowfall and the maximum depth of snow cover are widely used climatological data, but are not sufficient for a plan of various industries as well as agriculture. To improve the situation, the period and area of heavy snow fall in Shikoku Island are studied.
Generally the snow cover quickly melts away in this district, however, in some area or in some years it covers the ground for a long period of time, i. e, the phenomena called NEYUKI (continuos snow cover) in the snowy district are recognised. The necessity of estimation of probable maximum snow depth is discussed. Snow damage on the agriculture, traffics and electric powers, and a note on the histrical aspects of snow in this district are briefly described.View full abstractDownload PDF (1699K) -
Masayoshi SUGIMORI, Yoribumi KAGAMI1968 Volume 30 Issue 1 Pages 19-25
Published: January 30, 1968
Released on J-STAGE: July 23, 2009
JOURNAL FREE ACCESSThe photomicrographic observations on the particles of deposited snow were carried out from Jan. 13th to Jan. 20th, 1967, in the campus of Fukui University. At the same time, the measurements of density of snow were also made. From the 14th to the 17th, the snow lay about 85 cm deep, and on the 17th the total depth attained to about 97 cm in height.
By the photomicrographic observations, it was proved that the deposited snow changed rapidly to the compressed state in three days after the snow fall. On the 18th as the temperature was raised to 3-4°C from below zero, the state changing was accelerated, and the deposited snow was identified into three principal layers. It rained on the 19th, which permeated into and transformed the snow particles into granular ones. On the 20th, all the snow layers became wet and the depth of snow decreased to 57 cm.View full abstractDownload PDF (22359K) -
Kihei TAKAHASHI, Shigeo ONO, Toshitsugu KAWAGUCHI1968 Volume 30 Issue 1 Pages 26-30
Published: January 30, 1968
Released on J-STAGE: July 23, 2009
JOURNAL FREE ACCESSA forest in a small watershed at kamabuchi Experimental Forest was completely cut. After cutting all sprout-growth on the cleared area was cut back two times a year for five growing seasons. Then the vegetation was burn from the 6th year successive years without the former cutting of sproutgrwoth and the watershed became covered by thick miscanthuse. Three small landslides occured five years after the treescutting. Seven years after cutting total-layer avalanches occerred and their size increased from year to year.
The reason for this occurrence of avalanches may be attributed to the fact that : (1) the stumps were pressed out by the creeping pressure of snow; (2) the landslides occurred : these two causes (1) and (2) in turn contributed to the instability of the snow cover on the steep slope. (3) furthermore the friction resistance of the ground surface against snow cover decreased due to the loss of resistance produced by the over lying profuse miscanthuse cover.View full abstractDownload PDF (11422K)
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