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.