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   风吹雪 在 地质学 分类中 的翻译结果: 查询用时:0.018秒
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  drifting snow
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.
      
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The highway mountain hazards of the Chinese Tianshan Mountainous Region mainly distribute in the modern periglacial regions above 3,000m of altitude,especially in the territory of the North Xinjiang Uygur Autonomous Region. The hazards along the Dushanzi-Kuqa and the Urumqi-Korla Highways are very serious. Typical mountain hazards are avalanche,drift snow, natural accumulation snpw,debris flow and rock glacier; secondly are talus, thermo-settlement and thermo-suffosion. The hazards would bury the whole route...

The highway mountain hazards of the Chinese Tianshan Mountainous Region mainly distribute in the modern periglacial regions above 3,000m of altitude,especially in the territory of the North Xinjiang Uygur Autonomous Region. The hazards along the Dushanzi-Kuqa and the Urumqi-Korla Highways are very serious. Typical mountain hazards are avalanche,drift snow, natural accumulation snpw,debris flow and rock glacier; secondly are talus, thermo-settlement and thermo-suffosion. The hazards would bury the whole route of high way, destroy the snow-defence gallery,highway basement and protection building.It should put prevention first for the hazards, meantime, combine to take the control steps. For new route or relocation of route after now,in route selection,it should select the places which will be far from modern glacier and on,have few gullies and sunny slope (or windward slope), wide depression (or wide valley), yet which slope bedrock will be hard and stable, will have few frost weathering debris but better plant cover. In road- bed design, it is necessary to take the following steps,that is,raise road-bed higher and widen it,smooth marginal slope to down,put attention to drainage. In section of serious avalanche, more tunnels and snow-defence galleries should be used.For the highway in use, according to the different hazard types and degrees, protective facilities and cleaning mechanical equipments should be added. For the broken bedrock slopes,the block wall or block nets and steel railings to attach to the slopes should be set up. But for debris flow,it is important to first investigate their source about glacier ablation factor,loose accumulation volume. Before understanding for the exact case,air temperature 25℃may be take as thecritical value for taking place glacial debris flow in the Dushanzi-Kuqa Highway. Meanwhile, the transfer trough may be build at the intersection of the debris flow outlet and the highway. For the dangerous snow-defence gallery harmed by thermo-suffosion, it should be done to get rid of infiltration water immediately and use sand-gravel road-bed with better heatproof property to replace the initial road-bed for taking preventive measures against possible calamities.

天山山区公路山地灾害主要出现于海拔>3000米的现代冰缘区,遭山地灾害威胁较严重的是独山子—库车公路和乌鲁木齐—库尔勒公路。较突出的山地灾害是雪崩、风吹雪、自然积雪、泥石流与石冰川,其次是倒石堆、热融滑塌和热融掏蚀。该区公路山地灾害防治应采取预防为主、防治结合的原则,此外应加强灾害预报。

 
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