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冰川冻土 ›› 1986, Vol. 8 ›› Issue (4): 381-387.

• 研究论文 • 上一篇    下一篇

我国的干雪雪崩

王彦龙   

  1. 中国科学院兰州冰川冻土研究所
  • 收稿日期:1985-02-01 修回日期:1985-07-22 出版日期:1987-11-25 发布日期:2012-04-26

Dry-snow Avalanche in China

Wang Yanlong   

  1. Lanzhou Institute of Glaciology and Geocryology, Chinese Academy of Sciences
  • Received:1985-02-01 Revised:1985-07-22 Online:1987-11-25 Published:2012-04-26

摘要: 干雪雪崩是我国大陆性气候条件下,危害性较大的一种雪崩类型。这类雪崩主要发生于松散无水的新干雪和老干雪的雪层中,在其运动过程中,体积愈来愈大,不但冲击力大,而且能触发大量雪体崩塌,往往给人们的生命财产造成威胁,是我国山区经济建设的一种严重自然灾害。为了查明它的发生、运动和堆积规律,我们进行了大量观测和研究,现将结果讨论如下。

Abstract: In China the dry-snow avalanche, that occurs under continental climatic condition, is a kind of avalanche with rather serious. It occurs mainly in layers of new or old dry-snow. The dry-snow is usually formed when the air temperature is very low. The dry-snow has different types according to its formation conditions such as air temperature, convection intensity and deposition duration. In accordance with its features we divided the dry-snow into three types, i.e. quasi-now dry-snow, ordinary new dry-snow and old dry-snow.In the continental type avalanche area the rather serious dry-snow avalanche belongs in ordinary new dry-snow avalanche,fortuitously in full-depth, depth-hoar avalanche. The ordinary dry-snow avalanche occurs during or after a heavy snowfall, directly controlled by air temperature and the magnitude of solid precipitation. It is easy to occur when the mean monthly air temperature is below -5℃ and the snowfall is in a medium magnitude. The spatial and temporal distribution of the ordinay dry-snow avalanche depends on air temperature, while its scale and disastrous consequence on accumulated depth of snow cover.At last, the movement characteristics of typical ordinary dry-snow avalanche are described in detail.