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Volume 30 (1968)
- Issue 6 Pages 169-
- Issue 5 Pages 131-
- Issue 4 Pages 103-
- Issue 3 Pages 61-
- Issue 2 Pages 35-
- Issue 1 Pages 1-
Volume 30, Issue 3
Displaying 1-5 of 5 articles from this issue
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Mitsuo DAGUCHI1968 Volume 30 Issue 3 Pages 61-69
Published: May 30, 1968
Released on J-STAGE: July 23, 2009
JOURNAL FREE ACCESSA series of field research works was carried out to get information of snow accumulation, physical properties of snow cover and their change in early spring at Gosyõgahara Village in the north-eastern part of Katsuyama City, Fukui Prefecture, from Mar. 20 to Apr. 15, 1967.
Observations were made on physical properties of snow cover, temperature, hardness, grain size, and free water content.
Figures (3) - (10) in the text show the vertical profiles of hardness R (in g· cm-2), density G (in g·cm-3), grain size D (in m /m), free water content W (in %) and porosity P (in %), estimated from density and water content, of the deposited snow.
Figures 17 (a)-(e) show mutual relation between hardness and porosity of the accumulated snow.
From these investigations. a relation between hardness and porosity of the deposited snow was obtained as,
R=Ae-αP2
Where A and α are positive constants.View full abstractDownload PDF (9649K) -
Shigeo WATANABE, Seiichi NEZU1968 Volume 30 Issue 3 Pages 70-72
Published: May 30, 1968
Released on J-STAGE: July 23, 2009
JOURNAL FREE ACCESSA measurement was tried to investigate the settling pressure actig on a body like a forest tree being enforced to move down in the snow pack. The measuring device consisted of a flat board, 50 cm long by 10 cm wide, placed horizontally by a prop at a height of 1 m above the level ground. The lower end of prop was connected with a pressure gauge in the underground room. The settling pressure of deposited snow acting on the board was indicated on the gauge. The board was lowered gradually in the snow pack by every half distance of natural setting, and the subsequent increase of settling pressure was observed.
The observation was carried out during the snow season of 1967-1968, at which the maximum snow cover depth was 306 cm. The downward displacement to the board was given thirteen times within the range of 2-60 mm. When the board was lowered, the settling pressure on it became to zero and gradually began to increase in course of time. After one or two days, the settling pressure returned to about 60 % of that acting on a flat board of same size fixed at 1 m height above the ground, and finally it recovered to about 70 %. At the end of winter, no remarkable breakdown was seen in the stratified structure of deposited snow around the equipment.View full abstractDownload PDF (2516K) -
[in Japanese]1968 Volume 30 Issue 3 Pages 73-74
Published: May 30, 1968
Released on J-STAGE: July 23, 2009
JOURNAL FREE ACCESSDownload PDF (308K) -
Ryuzo WAKABAYASHI, Masaru YAMAMURA1968 Volume 30 Issue 3 Pages 75-80
Published: May 30, 1968
Released on J-STAGE: July 23, 2009
JOURNAL FREE ACCESSThe block-type debris as Photo. 2 were found at several avalanched sites (Fig. 1) in Hokkaido.
Data obtained are illustrated on Table 1 and Fig. 3.
The results are summarized as follows :
1. The block-type debris are formed when sliding snow are stopped just under nose of fracture lineagainst their obstacles (gentle slope, shrubs, or fixed snow depositions as Fig. 2).
2. The slide surfaces of thin strata are composed of depth hoar or of granular snow in almost cases as Fig. 3.
3. There are much of compact snow at the sites where the hard block-type debris are found (A, B, and E). On the other hand, there are much of granular snow where the nothing is remarkable but the loose block-type traces (C and D).
4. Sliding processes of snow-slab avalanches are discussed with observations of debris forms and crack directions (Photo. 1 to Photo. 6).
5. It is infered that the snow-slab avalanches of the ground avalanche type have occured widely on districts of 1.0 to 1. 5m snow depth in Hokkaido and that they have a tendency to form several slide surfaces in sliding snow concurrently.View full abstractDownload PDF (7567K) -
Mitsuo DAGUCHI1968 Volume 30 Issue 3 Pages 81-88
Published: May 30, 1968
Released on J-STAGE: July 23, 2009
JOURNAL FREE ACCESSA field research work was carried out to investigate physical properties of mountain snow forming firn, located near the top of valley of Mt. Hakusan, Ishikawa Prefecture, in this summer.
The firn size was about 60 × 90 (m2) and 56 (m) in depth at the center.
Summarizing results of observations, the density of the firn was about 0. 600. 65 (g· cm-3), water content was about 10 (%) and hardness was 7×1032×105 (g· cm-2).View full abstractDownload PDF (11910K)
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