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从地貌地质环境、地面气象要素、大气环流背景、T213数值预报产品和卫星资料等方面,并着重从气象条件,对2007-09-04西藏波密县古乡天摩沟发生的一次特大泥石流灾害事件进行成因分析。结果表明:由于前期气温持续偏高,加剧冰川融水,加上9月4日凌晨出现强降水,天摩沟地形高度落差大、松散固体物质丰富,水源、能量转化和物源三者同时满足,是造成这次特大泥石流灾害的直接原因。
From the aspects of geomorphic geomorphology, ground meteorological elements, atmospheric circulation background, T213 numerical prediction products and satellite data, etc., and focusing on the meteorological conditions, a large debris flow disaster occurred in Tianzhu, Guxiang, Bomi County, Tibet, 2007-09-04 Cause analysis of the incident. The results show that due to the continuous high temperature in the early stage and the aggravating glacier meltwater, together with the strong precipitation in the early hours of September 4, the height of the terrain in Tianzhu Channel is large and the loose solid matter is abundant. The water source, energy conversion and provenance are simultaneously satisfied , Is the direct cause of this extraordinary debris flow disaster.