雪庇防止における板塀柵の調査

概要

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1. On the proccess of cornice growth. When wind blows at the speed of 11 m/sec., the cornice at the mountain top grows at the rate of 4 cm/10 minutes. Growing about 20 cm long, the cornice looks always like the plate, which bends downward by its own weight. While the snow-storm continues, the cornice keeps on growing. 2. On the change of wind velocity by using the almost closed fence. The wind velocity at the top of the fence is 1. 4 times larger than that of the other parts. 3. On the state of wind stream by using the fence which has a gap in its own bottom. When the fence gap is 70 cm in width, we find different phenomenon of wind stream between 0.5m and 1. Om under the top of the fence. 4. On the state of snow which passes through the gap of the fence bottom. After passing through the fence gap, the snow-flake flies about 10m-15m in distance.