巻号一覧
15 巻, 6 号
選択された号の論文の4件中1～4を表示しています
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孫野 長治1954 年 15 巻 6 号 p. 1-4
発行日: 1954/08/15
公開日: 2009/07/23
ジャーナル フリーPDF形式でダウンロード (620K) -
原田 干三1954 年 15 巻 6 号 p. 5-11
発行日: 1954/08/15
公開日: 2009/07/23
ジャーナル フリーPDF形式でダウンロード (1240K) -
槐 嘉代子1954 年 15 巻 6 号 p. 12-18
発行日: 1954/08/15
公開日: 2010/01/20
ジャーナル フリーThe 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.抄録全体を表示PDF形式でダウンロード (1167K) -
第1報方法の改良並びに含水の分離状態四手井 綱英, 菊谷 昭雄1954 年 15 巻 6 号 p. 19-24
発行日: 1954/08/15
公開日: 2010/01/20
ジャーナル フリーThe 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.抄録全体を表示PDF形式でダウンロード (849K)
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