摘要
沙丘是柴达木盆地可类比火星的重要地貌类型,沙丘形态是类火星风沙地貌研究的重要内容。基于数字地形分析(DTA)的方法,采用高程、坡度、坡向及地表复杂程度4个地形计量学指标对火星(北极地区)和地球(柴达木盆地)格状沙丘的地貌形态特征进行定量对比分析。结果表明:(1)两个研究区的高程剖面、坡度、坡向的地理学空间分布格局具有较大相似性;(2)高程、高程梯度、坡度和坡向的直方图相似度指数均大于0.7;(3)不同尺度上的分形维数近似相等,即地表复杂程度相似。用数字地形分析与直方图相似度指数结合的方法,定量或半定量地分析两个研究区沙丘地貌形态的相似性,这对类火星风沙地貌研究中科学选择试验点是一种新的尝试,以期为反演火星风沙地貌的形成与演化提供科学依据。
A dune is an important geomorphologic type in Qaidam Basin,to which the similar type of unit on the Mars can be compared,and the morphological characteristic of a dune is an important study content of the aeolian geomorphology on the Mars.In this paper,geomorphologic characteristics of lattice dunes on the north polar area of the Mars were analyzed in comparison of the dunes in Qaidam Basin on the earth.Digital Terrain Analysis(DTA)was used in the study by considering elevation,slope,aspect and surface complexity.The results show:(1)There is a great similarity of elevation cross-sections,slope steepness,distributions of aspect between the two study sites,ie Qaidam on the Earth,and north pole of the Mars.(2)The histogram similarity index of elevation,elevation gradient,slope steepness and aspect from a statistical analysis are all greater than 0.7.(3)The fractal dimensions remain almost the same at different scales,that means complexities on the two ground surfaces,north pole of the mars and Qaidam,are significantly similar to each other.A quantitative or semi-quantitative study of similarity of aeolian dune geomorphologies between the two planets,the Mars and the Earth,based on Digital Terrain Analysis(DTA)and Histogram Similarity methods,is a new attempt.This study will be expected to provide a scientific evidence for formation and evolution process of the aeolian geomorphologies on the Mars.
作者
杨旭艳
董治宝
杨勤科
李超
Xuyan Yang;Zhibao Dong;Qinke Yang;Chao Li(College of Urban and Environmental Science,Northwest University,Xi'an 710127,China;School of Geography and Tourism,Shaanxi Normal University,Xi'an 710119,China)
出处
《中国沙漠》
CSCD
北大核心
2021年第6期88-98,共11页
Journal of Desert Research
关键词
数字地形分析
分形维数
沙丘地貌形态
火星
地球
Digital Terrain Analysis(DTA)
fractal dimension
dune geomorphology
Mars
Earth
作者简介
杨旭艳(1987-),女,陕西铜川人,博士研究生,主要从事区域土壤侵蚀评价和数字地形分析研究。E-mail:yxyxd_gis@163.com;通信作者:董治宝(E-mail:zbdong@snnu.edu.cn);通信作者:杨勤科(E-mail:qkyang@nwu.edu.cn)。
