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Volume 15 (1953 - 195･･･
- Issue 6 Pages 1-
- Issue 5 Pages 1-
- Issue 4 Pages 33-
- Issue 3 Pages 21-
- Issue 2 Pages 11-
- Issue 1 Pages 1-
Volume 15, Issue 6
Displaying 1-4 of 4 articles from this issue
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Choji MAGONO1954 Volume 15 Issue 6 Pages 1-4
Published: August 15, 1954
Released on J-STAGE: July 23, 2009
JOURNAL FREE ACCESSDownload PDF (620K) -
Senzo HARADA1954 Volume 15 Issue 6 Pages 5-11
Published: August 15, 1954
Released on J-STAGE: July 23, 2009
JOURNAL FREE ACCESSDownload PDF (1240K) -
Kayoko ENJYU1954 Volume 15 Issue 6 Pages 12-18
Published: August 15, 1954
Released on J-STAGE: January 20, 2010
JOURNAL FREE ACCESSThe daily discharges of two streams, at Kamabuchi local station, Yamagata prefecture, of Forestry Expreimental Station, were used to study the effect of air temperature upon the thawing of snow ; the following results were obtained.
1. The degree-day factors were calculated by the mean daily maximum and minimum temperatures. The values of the degree-day factors seem to increase with the daily mean temperature. This fact is seen also on laboratory experiments.
2. If the forests were cleared, the values of this factor increased.
3. At the beginning of thawing, this factor is lager as the water equivalent of snow is large.
4. The total amounts of thawing snow of one season measured by the Thaw meter used in our labaratory or calculated from discharge of a small stream were not same to those measured by snow guage, and their relation differs by snow amount of a season ; i. e. the amounts by thaw meter or discharge were greater than those of snow guage when total amount in a season exceeds 800-900 mm. and vice versa.
5. The daily amounts of the thawing snow appear to be less influenced by the solar radiation, because the effect of the greater solar radiation in fine day is cancelled by the freezing temperature in early morning.
6. For the similar daily temperature, the weather of polar air mass seems to bring forth smaller thawing than that of maritime air mass.View full abstractDownload PDF (1167K) -
Report (1) Improvement of method and separative condition of content waterT. SHIDEI, A. KIKUYA1954 Volume 15 Issue 6 Pages 19-24
Published: August 15, 1954
Released on J-STAGE: January 20, 2010
JOURNAL FREE ACCESSThe authers made a study on the method of separation of free water content in Snow by the centrifagal separator, with the number of rotation of 1800/min.
This separator has snow jackets (Fig. 5) for interception of the effect of air temperature and 0°C gasoline is used as medium oil. Gasoline can easly separate free water from snow particles and can easly drive out the air bulbles in snow.
By this study, it is concluded that the centrifugal method is one of the excellent methods for measuring the free water content of snow.
The charactoristic points of this method are as follows :
1. This method has high accuracy. (the error is under 2% by weight)
2. This method is very convenient in field work, because the time for measurement is short (for one trial it takes about 10 min.) the equipment is light in weight and is simple (the total weight is about 5 kg).
The shortcoming of this method is that ;
Free water in new snow and settled snow cannot be fully separated, leaving about 58 % water by weight constantly.View full abstractDownload PDF (849K)
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