西藏林芝地区泥石流类型及形成条件分析  

Classification and Initiation Conditions of Debris Flows in Linzhi Area,Tibet

作　　者：胡桂胜[1,2,3] 陈宁生[1,2] 邓明枫[1,2,3] 王元欢[2] 

机构地区：[1]中国科学院山地灾害与地表过程重点实验室,四川成都610041 [2]中国科学院水利部成都山地灾害与环境研究所,四川成都610041 [3]中国科学院研究生院,北京100049

出　　处：《水土保持通报》2011年第2期193-197,221,共6页Bulletin of Soil and Water Conservation

基　　金：中国科学院知识创新工程项目"震裂坡地暴雨型泥石流滑坡综合防治理论与技术"(KZCX2-YW-332)

摘　　要：西藏林芝地区是我国泥石流灾害最为严重的地区之一,特别是近年来受全球气候变化的影响,冰川融化速度加快,冰川融水型泥石流灾害频频发生,危害极其严重。自2009年7月中旬开始,对该地区林芝、米林、波密、察隅4县30条泥石流沟做了系统调查。在研究该区域20条较具代表性泥石流沟的基础上,结合该区域已有研究资料,按泥石流形成的激发条件将其分为降雨型泥石流,冰川降雨型泥石流,冰崩、雪崩型泥石流,冰湖、堰塞湖溃决型泥石流共4类。进而从地形地貌、物源、水源及气温等方面分析了其形成条件。并在此基础上提出了针对性防灾建议。Linzhi area of Tibet is one of the most dangerous regions threatened by debris flows in China.Under the influence of global warming,the melting rate of glacier has accelerated in this area,leading to frequent initiations of glacier-melting debris flows,which is severely hazardous.Since the middle of July,2009,the authors had carried out systematic investigations regarding approximately thirty debris flow gullies in counties of Linzhi,Milin,Bomi and Chayu in Linzhi area.Based on analysis of the twenty typical debris flow gullies and related historic documents,debris flows were divided into four classes according to initial water conditions,namely,rainfall-induced debris flow,glacier-rainfall-induced debris flow,avalanche-induced debris flow,and lake-outburst-induced debris flow.The initiation conditions were analyzed regarding landform,soil source,water source and air temperature.Specific advices based on the analysis were recommended for disaster prevention.

关 键 词：林芝地区 泥石流类型 形成条件 

分 类 号：P694[天文地球—地质学]