Accordingly, it will provide necessary and accurate data for road construction, choosing of snow drift prevention and control facilities, road maintenance and management, and establishment of correlative decisions in the areas of snow hazard.
Research on the Model of Forecasting the Snowdrift Depth of Blowing Snow in Road
公路风吹雪积雪深预测模型研究
Through building the database system of snow drift on highway, information processing speed quickened and information management automatization was realized.
This paper goes on the following work which is based om actual project and analysis the influence on the tunnel mouth caused by wind blowing snow:1.Based on G045 line which is one of 18 east-to-west horizontal line in National highway network plan as a project ,this text analyzes the main factors which may exert an influence on the project in the course of snowdrift,put forward a corresponding prevention measure.
At the same time, the highway communication infrastructure of our country is still very weak , a lot of highway sections of the area which wind blows snow do not take prevention measurement ,or measurement improper which violates the law of wind blowing snow ,it has not played a role in protecting and aggravated the disaster, and it brings the threaten to the people's life and property.
The mean value of the maximum wind speed is 14.0 m·s~(-1) in the drifting snow disaster frequently (occurred) region along Jinghe-Yining railway of Xinjiang. The maximum wind speed and the maximum snow cover depth occurred once every 30 years is 20.3 m·s~(-1) and 160 cm respectively. The average precipitation in winter is 153.2 mm.
In drifting snow frequently occurred region, the main type of drifting snow disaster is drifting snow deposition in cutting and secondly drifting snow deposition on low-fill embankment.
It is considered that the suitable height of subgrade for preventing drift snow disasters is in a range of 200～1500cm, and the drift snow deposition can easily occur on the pavement if the subgrade is lower than 200 cm;
(3) Upper zone (snow drift avalanche zone): the movement of snow mantle creates disaster in this zone.
Calculations are made of the effects of thermal stability under a range of conditions, over the sea and land, on the physical factors (including the critical wind speed) affecting dust-storm generation, snow drift, and rough sea conditions.
The snow drift rate caused by creep, that is, by the ripple migration, was estimated to amount, at least, to 6% of the total snow drift rate.
Wind component fluctuations have been decomposed into contributions of large and small-scale eddies to study turbulence structures in the atmospheric surface layer over snow-covered pack ice for a case with snow drift and another without.
Impact Of Snow Drift On The Antarctic Ice Sheet Surface Mass Balance: Possible Sensitivity To Snow-Surface Properties
In the alpine zones of western North American mountains, topographic-moisture gradients are the results of winter winds blowing snow from the upper windward slopes and ridgetops into snowdrifts on the lee slopes.
They help control erosion and blowing snow, improve animal health and survival under winter conditions, reduce energy consumption of the farmstead unit, and enhance habitat diversity, providing refuges for predatory birds and insects.
Vertical profiles of wind speed, snow concentration, and humidity in blowing snow
Evaporation of blowing snow over 3 km of transport distance was estimated to be 39% of transport rate, under conditions of the experiment.
The extension of a density current model of katabatic winds to include the effects of blowing snow and sublimation
Nests were situated at sites which gave shelter from drifting snow or rain, from prevailing winds and from extreme radiation.
Transport rate of drifting snow and the mean wind speed profile
Snow ripples and their contribution to the mass transport in drifting snow
Morphological characteristics of snow ripples formed by drifting snow were investigated as functions of wind velocity in a cold wind tunnel at -15 °C.
However, the time variations of the turbulent kinetic energy and the friction velocity, determined by the small eddies, are suppressed when there is drifting snow.
风吹雪
snow drift
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