An outdoor experiment is conducted to investigate snowdrift that has much effect on the formation of snow cover depth on roof surface. Three types of model roof with respective roof levels and on existent roof are used to measure changes in snow cover depth and snowdrift with time. At the same time, the wind velocity, temperature and snow cover depth above the ground are measured. The levels of the existent roof surface ranges from 9 to 12 m. The results of this experiment are obtained as follws :
1) The higher the roof surface, the more the snowdrift. Snow cover depth on a roof is less than that on the ground.
2) Snowdrift on a roof is more likely to occur than that on the ground, because the surface wind has a vertical distribution, which increases in value with height.
3) The larger the roof surface is, the more the amount of snowdrift becomes when the wind blows hard. Hence, as roofs increase in area, the distribution of snow cover has become more ununiform.
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