基于数字高程模型的南天山地貌特征研究

STUDY ON LANDFORMS OF SOUTH TIANSHAN BASED ON DIGITAL ELEVATION MODEL

基于STRM-DEM((90 m)数据,利用ArcGIS空间分析模块,通过人工判定法、最大高差法以及最大高差与面积比法联合对比,获取研究区最佳分析窗口为31×31,面积约为7. 78 km^2,根据获取的最佳窗口提取出西南天山地区地形高程(最大高程、最小高程、平均高程)和地形起伏度。分析认为:西南天山山势陡峻,总体呈中东部高、西部低的地貌特征,且以高地形起伏度为主,沿西南天山走向方向,高山区地形起伏度自东向西逐渐降低;高海拔地区呈北东—南西向展布规律,反映了该地区遭受了南北向强烈挤压隆升作用;并通过条带状地形剖面分析研究区夷平面地貌特征,认为西南天山地区发育4级层状地貌面,反映了该地区的多次构造运动。

Based on the data of STRM -DEM（90 m）and the ArcGIS spatial analysis module, the optimal a- nalysis window of the study area was 31 × 31 by artificial judgment method, maximum height difference method and maximum height - difference method. The area about 7.78 km2, the topographic elevation （ maximum ele- vation, minimum elevation, average elevation） and topographic relief of the southwest Tianshan Mountains were extracted according to the best window obtained. The resuhs show that the southwest Tianshan has a steep mountainous area with a high central and eastern part of the western part low geomorphic features, with high re- lief and domination, along the strike direction of the Tianshan Mountains in the southwest, the undulating to- pography of high mountains gradually decreases from east to west;the distribution pattern of NE - SW in high altitude shows that the area suffered from NS to the strong extrusion uplift role; and through the strip topogra- phy analysis of the study area flat topography characteristics, that the development of the Southwest Tianshan 4 layered topography, and reflects its repeatedly tectonic movements.