【摘要】 青藏高原是我国滑坡泥石流等自然灾害最严重的地区之一,位于西藏波密县的古乡泥石流沟是川藏公路上重大灾害之一.在经过1966—2004年的弱活跃期后,古乡沟于2005年7月30日上午10:00左右、7月30日晚和8月6日上午8:00分别暴发了不同规模的大型冰川泥石流.淤积在公路面上的泥石流堆积物厚度达2 m左右,宽20多米,土方量约2×104m3,多次中断交通运营,对川藏公路的畅通和当地人民的财产造成巨大的损失.通过实地调查研究和分析,发现这3次泥石流暴发的原因与1953年相似,均是由集中降雨和持续高温共同作用的天气所致.更多还原

【Abstract】 Tibetan Plateau is one of the most serious debris flow hazard regions in China.Debris flow in Guxiang valley in southern Tibet Region is one of the main hazards to Sichuan-Tibet Highway.The Guxiang debris flow was in inactive during the period of 1966 to 2004,and then it broke out at 10 am and night on July 30,and at 8 am on August 6,2005.The deposit on the road caused by the debris had a volume of 20 000 m~3 with a thickness over 2 m and a width over 20 m,which blocked the road for a long time and caused great loss of local people’s property.The debris flow in 2005 was caused by concentrative rainfall and continuous high temperature,same as that in 1953.更多还原