The Study Of Landform Based On Remote Sensing Image In The Northern Margin Area Of Tengger Desert

The study focused on the northern edge of Tengger Desert in Inner Mongolia and was conducted based on two projects: the “Regional Geological Survey and Map Revision Project(1: 250,000) in Hari Aobao Buge(K48C003002), Wuliji(K48C004002), and Dalikemiao(J48C001002) Areas in Inner Mongolia” and the “Regional Geological Survey and Map Revision Project(1: 50,000) in the Busite(K48E017008), Engeerwusu(K48E018008), Chaganhanerhang(K48E019008), and Sunbuerwula(K48E019009) Areas in Inner Mongolia”.Based on previous research, the study investigated the classification, distribution, origin, composition, and age of the geomorphic units in the study area using remote sensing images. The other data used included the SRTM-DEM data, topographic map, geologic map, and dating data of this area. The objective of the study was to construct the time series and spatial sequence of different landforms in the area.A set of signs for interpretation of the area’s geomorphic features were established through remote sensing image interpretation. The images were combined with the topographic map, geologic map, and dating data of this area as well as related findings of previous research for a comprehensive interpretation. The geomorphic factors were extracted by analyzing the DEM data; then the geomorphic features of the area were analyzed in terms of various indicators, including elevation, slope, aspect, and relief. The analysis of images and DEM data indicated that the central part of the area is relatively high and stretches downs towards the south and north, with the northern region lower than the south. Main landforms in the area include mountains formed by dry denudation, hills, fluvial terraces, terraces formed by denudation, lacustrine terraces, alluvial fan, valley plain, and lacustrine plain. Overall, the geomorphic structure of the area is controlled by fault activities and characterized by alternative distribution of residual mountains formed by tectonic erosion and intermountain plains and basins under the influence of denudation and deposition. Aeolian sand widely occurs in the area. Mountains are generally low and middle mountains, with valleys, mostly flat and wide, occurring in between. In some regions, flood plain and terraces are well developed.