基于DEM的天峻县基本地貌形态类型研究

Research on the basic geomorphology form of Tianjun County based on DEM

本文基于ASTER GDEMV2版的30m分辨率的天峻县DEM数据,运用ArcGIS10.2软件,提取地形起伏度,并用均值变点法确定最佳计算单元,再将海拔高程与最佳计算单元下的地形起伏度进行叠加分析,得到天峻县的基本地貌形态类型图,以期为天峻县的城镇发展、灾害预测及治理等提供定量化的数据支持。结果表明:天峻县地形起伏度的最佳计算单元为11×11的网格大小,地形起伏度在0~498m之间;天峻县的基本地貌形态类型共有12种,其中,主要地貌类型有4种,面积占比为87.39%。空间分布上,高海拔丘陵主要分布在青海南山、疏勒南山和中部地区;高海拔平原主要分布在苏里乡南部并在天峻县中部呈零星分布;极高海拔丘陵分布在岗格尔肖合力、疏勒南山和托勒南山一带。

Based on the ASTER GDEMV2 version of the 30-meter resolution DEM data of Tianjun County,this paper uses ArcGIS10.2 software to extract the relief amplitude,and uses the change point method to determine the best calculation unit,and then superimposes the altitude and the relief amplitude under the best calculation unit to gain the basic geomorphology type map of Tianjun County.Hope to provide quantitative data support for urban development,disaster prediction and governance in Tianjun County.The results show that:The optimal calculation unit of Tianjun County’s relief amplitude is 11×11 grid size,and it’s relief amplitude between 0 and 498 meters;There were 12 types of basic geomorphologic forms in Tianjun County,of which 4 were the main types,with an area of 87.39%.In terms of spatial distribution,the high-altitude hills are mainly distributed in Qinghai Nanshan,Shule Nanshan and the central area of Tianjun County;the high-altitude plains are mainly distributed in the south of Suli Township and sporadic distribution in the middle of Tianjun County;the extremely high-altitude hills are distributed in Kanggarxolug,Shule Nanshan and Tolle Nanshan area.