摘要
以西藏朋曲流域达仓沟为研究对象,结合现场调查及遥感解译,总结了达仓沟流域的孕灾背景,再现了冰湖溃决泥石流特征,并在此基础上对该沟溃决泥石流发展趋势进行了分析。研究表明,流域现有冰川8条,冰湖11个,历史上至少爆发过3次大型冰湖溃决泥石流,其中最大的1956年冰湖溃决泥石流沟口峰值流量3 862 m3/s,流速8.06 m/s;目前流域内冰川呈现不断缩小的趋势,3处冰湖存在溃决风险,具备了形成泥石流的陡峻地形和丰富松散固体物质的充分条件,发生冰湖溃决泥石流可能性大。
Taking Dacanggou in the Pengqu Basin of Tibet as our research target, by means of field investigation and interpretation of remote sensing, the disaster-breeding backgrounds of Dacanggou Basin are summarized, the characteristics of the debris flow induced by breakout of glacier-lake are reproduced, and the development trend of ice lake collapse in Dacanggou Basin is analysised. The studies shows that there are 8 glaciers and 11 ice lakes in the basin, and at least three large-scale ice lake ruin debris flows broke out in history, and the ice lake collapse debris flow outbreak in 1956 is the largest one, whose peak flow and velocity in mizoguchi is 3 862 m3/s and 8.06 m/s. At present, glaciers in the basin show a decreasing trend, and there are three glaciers are at risk of outburst. There are sufficient conditions for the precipitous topography and the rich and abundant loose solid material that form the debris flow, so there is a large possibility of the glacial lake outburst in Dacanggou Basin.
作者
童龙云
张继
孔应德
TONG Longyun;ZHANG Ji;KONG Yingde(Sichuan Institute of Geological Engineering Investigation Group Co.LTD,SBGEEMR,Chengdu,Sichuan 610072,China)
出处
《中国地质灾害与防治学报》
CSCD
2019年第6期34-39,48,共7页
The Chinese Journal of Geological Hazard and Control
关键词
达仓沟
溃决泥石流
冰湖
冰川
遥感解译
Dacanggou
debris flow induced by breakout
ice lake
glacier
interpretation of remote sensing
