基于DEM数据的甘孜-玉树断裂东南段构造地貌研究

基于DEM数据,使用ArcGIS10.2软件提取了甘孜-玉树断裂东南段地区高程、地形起伏度、坡度、水系等地貌信息,结合地质资料,对其构造地貌特征进行初步研究探讨。研究表明,研究区地形起伏度在38~2088m之间、地形起伏度较大,地势总体上呈SW高、NE低的趋势;研究区总体坡度较大、地势较陡,断裂SW盘山体坡度值大于NE盘。甘孜-玉树断裂带活动影响下,断裂两盘地貌特征表现出明显的差异性。研究区内山体走向、河流流向与断裂走向一致,地貌形态受构造活动所控制。

Study on Tectonic Geomorphology of South-eastern Section of Ganzi-Yushu Fault Based on DEM Data

Based on DEM data, this paper acquired such geomorphological information as elevation, relief amplitude, swath profile, gradient and drainage system of the south?eastern section of Ganzi?Yushu fault by ArcGIS10. 2 software. Together with some geological information, tectonic landform features of this section were preliminarily investigated. As the result indicates, the sutdy area under exploration has the following features: a large relief amplitude ranging from 38m to 2088m, a general terrain trend of high?lying SW and low?lying NE, a generally large slope and a steep terrain, a larger gradient value of the SW side of the section than that of the NE side. Besides, under the influence of Ganzi?Yushu fault activity, there appears a big difference of topographical features between the two walls of the section. The range of mountain and the stretch of rivers are consistent with the trend of the fault, indicating that topography is under the control of tectonic activities.