新庄の平地における積雪断面観測(昭和49年〜50年冬期)

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This report contains the observational results of snow cover in Shinjo, Tohoku district of Japan from November, 1974 to March, 1975. The depths of snow cover and snowfall were measured at 9 : 00 a.m. every day in the snow season and the results of the measurement are shown in Fig.1 and Table 6. Physical properties such as density, thickness, hardness, temperature and free water content of snow were observed on each snow layer at the level land of this Branch on the periodical observation dates which were usually the 5th, 15th and 25th of each month(at least three times a month). If the observation was unable on the fixed date, it was made on the day before or after the fixed date. All the observational results of snow cover are shown in Fig.2(1) to Fig.2(12) and Table 5(1) to Table 5(12). The density range of snow was between 0.05 and 0.48g/cm^3 and the maximum value of 0.48g/cm^3 was observed in the granular snow on March 14. The free water content was in the range of 0〜41% and the maximum value of 41% was observed in a snow layer which was nearly saturated with water, on January 25. The snow temperature range was 0〜-7.6℃ and the minimum value appeared on January 6, when the depth hoar was observed. Range of the hardness was 3.6〜3, 100g・wt/cm^2 and the minimum value was observed in the new snow on December 25 and the maximum in the frozen granular snow on March 5. The average snow density of 0.41g/cm^3 throughout the depth of snow cover was maximum during the observational period and was observed on March 14. The maximum water equivalent of snow of 415mm was found on March 5. As to ascertain the level of the snow layer, the acryle lacquer was sprayed on the surface of the snow cover on January 16 and on February 15. Spraying the the acryle lacquer is a very effective way to recognize the layer of the snow cover without giving any disturbance to the layer afterwards. The acryle lacquer must be sprayed during a snowfall on the snow surface not to absorb the solar radiation.
独立行政法人防災科学技術研究所の論文
1978-12-25

新庄の平地における積雪断面観測(昭和49年〜50年冬期)

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