西藏江河堵溃灾害及成灾环境分析  

Analysis on Environment of Disasters Resulting from River Blockage in Tibet

作　　者：程尊兰[1,2] 田金昌 张正波 强巴 

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]西藏自治区交通科学研究所,西藏拉萨850001

出　　处：《灾害学》2009年第1期26-30,共5页Journal of Catastrophology

基　　金：国家自然科学基金(40771024);交通部西部交通建设科技项目(200631879284);水利部公益项目(200801032)资助

摘　　要：江河堵溃灾害指由江河两岸大规模滑坡、泥石流等在主河道形成堵塞坝和溃决造成的灾害。西藏近年发生的14次江河堵溃灾害都分布于藏东、藏南地区。根据形成江河堵塞坝的山地灾害类型其可划分为滑坡堵溃灾害和泥石流堵溃灾害及滑坡、泥石流混合堵溃灾害,形成过程各有特点。西藏江河堵溃灾害集中分布于藏东、藏南,这与这里下述因素有关:河谷深切,山高坡陡;新构造运动活跃,地震频繁;第四系冰碛等松散堆积物深厚;海岸性冰川发育,冰湖广布。Blockage of rivers by large landslides often results in great disasters. In the recent years, there have been 14 events of river blockage in the east and south of Tibet. The disasters can be identified as debris flow, landslide, and sometimes the combination of them. Such disasters are mainly distributed in the east and south of Tibet because of their geomorphologic features of deep incision, steep slope, and active neotectonic movement, and the frequent seismic activities. In particular, loose materials due to the Quaternary moraine glacier abound in the area, which provide material sources for landslides and debris flows.

关 键 词：西藏 滑坡 泥石流 堵溃灾害 成灾环境 

分 类 号：P642.2[天文地球—工程地质学]