雪崩災害地の積雪断面観測(1986年能生町雪崩災害現地調査報告)

概要

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A lage-scale avalanche occurred at midnight (about 23 : 00) on January 26, 1986 at Maseguchi (Nou-machi, Nishikubiki-gun, Niigata-ken) and caused a large disaster. Profile observation was carried out at one point of the site of the avalanche debris and two points on natural snow cover areas undisturbed by the avalanche. The observation items are weather, air temperature, snow depth, condition of snow layers, snow temperature, grain size of snow, snow density, Rammsonde hardness, Canadian gage hardness, full depth average density, and structure of snow layers. The results of the observation are summarized in Tables 1, 2 and 4 and Figs.3 and 4. From comparison on the observation data at the Institute of Snow and Ice Studies in Nagaoka, it is found that the snow cover formed before January 20 at Maseguchi had the same depth and weight with that in Nagaoka, however, that the snow cover formed after January 20 was two times in depth and three times in weight of that in Nagaoka.
独立行政法人防災科学技術研究所の論文
1987-03-30