新潟県柵口地区表層雪崩の流動解析

概要

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The large scale powder snow avalanche which occurred at Maseguchi, Niigata, is simulated by a fluid dynamical model, which uses the conservation equations of air, snow particles, momentum of avalanches, and kinetic energy of turbulence. The powder snow avalanche was generated on the steep slope of Mt. Gongendake located near Maseguchi, where thirteen people were killed at 11 : 00 pm on 26th January 1986. Horizontal distance between Maseguchi and the summit of Mt. Gongendake is about 1800 m and the steepest angle of the slope of Mt. Gongendake is about 50°.<BR>The depth of the newly fallen snow layer is considered in the model as an important parameter. As the depth of the newly fallen snow layer grows, the concentration of snow particles in the avalanches increases and the speed of the avalanches rises. It is concluded that a depth of newly fallen snow layer of over 2 m, which value is almost the same value as was observed at Maseguchi just after the avalanche, is needed to form the storng powder snow avalanche which was able to reach Maseguchi.
社団法人日本雪氷学会の論文