【摘要】 龙门山处于青藏高原东缘,是全球构造活动较为强烈的地区之一.青衣江流域位于龙门山的南段,研究青衣江对厘清龙门山南段的构造活动具有重要的意义.利用DEM数据,提取青衣江流域的地形坡度和河流剖面形态,以基岩河道河流水力侵蚀模型为基础,分析发现地形坡度较大的区域多集中在大川—双石断裂的上盘区域,构造隆升是造成坡度差异的主要原因.青衣江水系在河流水力侵蚀模型对数图解中表现为上凸特征,表明基岩的隆升速率大于河流的下切侵蚀速率.青衣江流域的地壳隆升速率和侵蚀速率呈正相关的关系,即隆升速率越快,下切速率也就越快.青衣江流域整体处于抬升状态,揭示龙门山造山带内的地貌发育仍然处于前均衡状态,同时也从侧面证明龙门山地区是整个青藏高原垂直隆升和侧向挤压的最新和最前缘部位.更多还原

【Abstract】 Longmen Mountains in the eastern edge of the Tibetan Plateau,is a more intense tectonic activity of the region in the world. Qingyi river is located in the south section of the Longmen Mountain,the study of the Qingyi river has important implications for clarifying the southern section of the Longmen Mountain tectonic activity. Using DEM data and extract the qingyi river basin terrain slope,river profile form,based on the stream-power incision model,tries to reveal strong tectonic activities characteristics of the Qingyi river basin river since the late Cenozoic. Through analysis found that the terrain slope larger area more concentrated in the upper wall of Da Chuan-Shuang Shi fault,the tectonic uplift is the main cause of slope difference; Qingyi river drainages in logarithmic diagrams of the stream-power incision model is shown as the up-convex features,indicates that the bedrock uplift rate is greater than the incision rate.The Qingyi river drainages uplift rate and incised rate were positively correlated,the uplift rate faster,incised rate is also faster. Qingyi river drainage as a whole in a state of uplift,the landscape of Longmen Mountains orogenic belt is still in a pre-steady,the Longmen mountain is the latest and the most front part of Qinghai-Tibet Plateau uplift vertical and lateral extrusion.更多还原