大别山构造地貌的DEM初步分析

以地理信息系统（GIS）为平台，利用航天飞机雷达地形测量（SRTM）数据，构建了大别造山带地区的数字高程模型（DEM），对大别山地区的构造地貌进行了模拟解译分析。研究表明，大别山在造山带走向和垂直走向的方向上都是中间高、两边低，两边地势低的部位发育断陷盆地。SRTM DEM地貌图显示，郯庐等大断裂地貌特征明显，断裂构造严格控制了水系的发育，大别山水系多呈格子状分布，在地貌上主要表现为河流的大角度转弯以及主支流近直角交汇；由于本区地壳沿断裂作差异性升降运动，造成地堑谷、断块山和断陷盆地并存的地貌特点。本文统计分析了坡度与高程之间的相互关系，并提取了夷平面信息。

DEM ANALYSIS OF THE TECTONOGEOMORPHOLOGY OF THE DABIE OROGENIC BELT

This paper constructs a digital elevation model(DEM) of the Dabie orogenic belt and performs a modeling analysis of its tectonogeomorphology based on the techno-platform of the geographic information system(GIS) and shuttle radar topography mission(SRTM) topographical data.The relief of the Dabie orogenic belt is high in the central part and low on two sides both along the trend of the belt and in the direction perpendicular to the trend,and downfaulted basins are developed on both sides where the relief is low.On the SRTM-DEM geomorphologic map and slope image,the geomorphologic features of main faults such as the Tanlu fault are conspicuous and the drainage systems,which are strictly controlled by faults,mostly present a trellis pattern.Geomorphologically the streams turn at high angles and the main tributaries intersect near right angles.The differential uplift and subsidence of the crust in the area along the faults resulted in the coexistence of graben valleys,fault block mountains and downfaulted basins.This paper also analyzes the relation between the slopes and elevations and gets the information of planation surfaces in the Dabie orogenic belt.