雅鲁藏布江大拐弯入口格嘎冰川泥石流堵江影响分析  

Impact Analysis of Gega Glacier Debris Flow Blocking of River at Entrance of Brahmaputra Bend

作　　者：王毅[1] 张运达[1] 

机构地区：[1]中国电建集团成都勘测设计研究院有限公司,四川成都610072

出　　处：《四川水力发电》2015年第4期81-84,140,共4页Sichuan Hydropower

摘　　要：晚更新世中晚期的末次冰期,雅鲁藏布江入口的格嘎冰川发生大规模堵江和堰塞,形成沿江长达20多km的堰塞坝和上游200余km的堰塞湖,回水高程超过3 150 m,沉积了多层堰塞湖相地层。全新世以来冰川活动大幅退缩,但冰川泥石流活动仍可能局部淤塞或短暂堵塞雅鲁藏布江,给沟口和下游地区带来不利影响。根据格嘎冰川在末次冰期的堵江历史、堰塞沉积和冰后期格嘎冰川的活动情况,分析并预测了今后在暴雨条件下发生泥石流对堵江的影响。In Middle-late stage of late pleistocene,landslide dams over 20 kilometers along the river and the quake lake in 200 kilometers upstream were formed by Gega glacier debris flow blocking of river and landslides,and backwater elevation is at 3150 m and more,at the same time,the multilayer lake facies strata were deposited. Glacier activities have retreated significantly since the holocene,but the glacier debris flow activities may still result in local silting or temporary blocking in the Brahmaputra River,which is detrimental to downstream areas. Based on the last river blocking history of Gega glaciers,landslide deposition and later movements of the Gega glacier,analysis and prediction are made to the influence of debris flow on river blocking under the condition of heavy rain in the future.

关 键 词：格嘎冰川 堰塞湖 泥石流 堵江影响 

分 类 号：P642.23[天文地球—工程地质学] P343.6[天文地球—地质矿产勘探]