中文摘要：

为了研究渭河水系流域地貌特征及其成因,以SRTM-DEM为基础数据,运用ArcGIS软件平台从DEM数据中提取渭河流域内独立的65个小流域,其中43个位于北岸,22个位于南岸;然后划分盆地等级,计算每个流域单元流域的面积、周长、河流总长、形状指数、平均坡度、相对高差以及高程-面积积分值和水系分支比等。通过对流域地貌参数以及高程-面积积分值和分支比等特征参数的分析,发现渭河南北两侧水系和亚流域的发育具有明显的不对称性。成因分析显示,渭河水系的这种特点虽与气候和岩性有关,但新生代以来自北向南的构造掀斜隆升作用是造成渭河流域南北差异特征地貌的主要原因。这些特征指示了渭河水系南北两侧晚新生代构造活动的差异性,反映了秦岭造山带晚新生代以来发生自北向南的掀斜隆升作用。

英文摘要：

In order to study geomorphology characteristics of the Wei River Basin and its formation reasons,the ArcGIS software platform was used to extract the data of geometrical shapes and boundaries of 65 sublevel individual watersheds in the Wei River Basin with SRTM-DEM as the basic data,43 in the north bank,22 in the south bank.Afterwards,the watershed areas,perimeters,river lengths,shape indexes,average slopes,relative height differences,elevation-area integral values,the drainage branching ratios and the basin level of the 65 watersheds were calculated.Results show that the Wei River sub-basins have something different characteristics in the north and south banks.These features is related to climate and Lithology,but uplifting and tilting from north to south is the main reason for the differences features of topography between north and south of the Wei River Basin.It suggests that late Cenozoic tectonic activity differences in the both sides of the Wei River Basin and Qinling Mountains have been uplifted and tilted from north to south.