中文摘要：

雅鲁藏布江（以下简称雅江）的河流地貌过程伴随着青藏高原的抬升而演变,其河流地貌和泥沙沉积特征十分独特.2009-2012年非汛期采用大地电磁测深仪对雅江29个典型河谷断面的沉积物剖面进行测量,并且采集自谢通门至雅鲁藏布大峡谷约1 000km河段泥沙沉积物样品进行分析.结果显示,过去百万年来因为喜马拉雅山不均匀抬升（宽谷河段相对于其下游的峡谷河段抬升慢）,雅江主要宽谷河段蓄积了约5 180亿m3的卵石夹沙沉积物,使得河谷底部抬高变宽,V型河谷转变为U型河谷.而抬升速率快的河段河床侵蚀下切,形成峡谷.

英文摘要：

The fluvial process of the Yalu Tsangpo River occurs concurrently with the uplift of the Qinghai-Ti- bet an Plateau. Therefore, the river exhibits unique features in morphology and sediment deposition. Field in- vestigations were performed from 2009 - 2011 and the depth of the interface between the sediment deposits and bed rock was detected with an electromagnetic imaging system at 29 cross sections. Sediment deposits were sampled along the Yalu Tsangpo Valley from Xietongmen to the Yalu Tsangpo Canyon. The results show that a huge amount of sediment has been deposited in four wide valley sections because the uplift rate in these sec- tions was lower than that in the downstream gorge sections over the past million years. About 516 billion m3 of gravel and sand have been stored in the high mountain river valleys, which has changed the V-shaped moun- tain river valley into a U-shaped wide river valley in the four sections. In the sections with high uplift rates the river bed is incised and has formed gorges and the Yalu Tsangpo Canyon.