道路標識への着雪とその防止
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概要
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Visual observations of snow accretion on signs and continuous measurements of the wind velocity and the air temperature have been made in blowing snow in the Ishikari plain, Hokkaido. The flow and velocity distribution of wind around and on the surface of signs was measured.<BR>The set of results show that snow accretion develops around the wind stagnation point of sign, that at a wind velocity exceeding 4 to 5 m/sec the sign is covered even with dry snow which does not contain liquid water and that this dry snow accretion can occur more easily with increasing wind velocity, with ascending air temperature and with decreasing area of sign.<BR>The dry snow accretion is classified into three types. One of the most frequently observed among them is caused by strong collision of snow against sign. The snow accretion of this type is explained in terms of snow melting at the contact points of snow and sign by the collision which transforms the kinetic energy of snow into internal energy of it and melted snow adheres to sign.<BR>Experiments for preventing snow accretion were carried out by three methods : 1) Utilization of wind force, 2) Surface treatment of sign, 3) Alteration of the wind flow around sign. Among them, the last method of altering the wind flow is applicable of making shift the wind stagnation point, making snow collide with sign at an acute angle so that the snow accretion becomes more difficult.<BR>Thus, the last method is effeetive for practical use.
- 社団法人 日本雪氷学会の論文