表層雪崩の堆積層について(1986年能生町雪崩災害現地調査報告)

概要

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A large-scale surface avalanche occurred midnight on January 26, 1986 at Maseguchi, Nou-machi, and catastrophic disaster occurred with the 13 deads. After 38 hours of the avalanche release, profile observation of snow debris was carried out at the deposit zone of the avalanche. By the preliminary analysis following results were obtained. (1) Temperature of snow debris of 110cmin thickness was homogeneous (mean temperature gradient;0.2℃/m) and lower than natural snow cover by-0.6℃/m. (2) Profile of snow density showed inverse layer with maximum density at the middle of the debris layer. Mean density of debris was 0.24g/cm^3 and the mean density of corresponding natural snow cover was 0.12g/cm^3. (3) By comparing the weight of natural snow cover and debris layer, natural snow cover graded by avalanche was estimated at 50cm of new snow.
独立行政法人防災科学技術研究所の論文
1987-03-30