黄土丘陵地形谷脊线展布特征  

Spatial pattern of terrain feature lines of Loess gully-hill region

作　　者：周毅[1] 汤国安[1] 张婷[1] 罗明良[2,1] 贾旖旎[1] 

机构地区：[1]南京师范大学虚拟地理环境教育部重点实验室,南京210046 [2]中国科学院成都山地灾害与环境研究所,四川成都610041

出　　处：《干旱区地理》2010年第1期106-111,共6页Arid Land Geography

基　　金：国家青年科学基金项目(40801148);国家高技术研究发展计划(863计划)(2006AA12Z212)

摘　　要：地理对象的空间展布格局特征是区域地貌研究的核心问题。其中,把握地物的组织结构及尺度范围特征是认识其空间展布格局的根本。选取黄土丘陵沟壑区韭园沟流域为实验样区,以流域地形特征线为切入点,采用空隙度系列分析方法,在5 m分辨率DEM上研究黄土地貌发育中期小流域内,地形谷脊线的空间展布格局特征。在东-西、南-北两个方向的探测结果表明:韭园沟流域谷、脊线均具有自组织、多尺度、自相似的格局特点,但各向异性特征不明显。在两个方向上均具有三个特征尺度范围:在东西方向上尺度范围分别为540 m、2100 m、4845 m;南北方向上尺度范围分别为1215 m、2810 m、5700 m。该研究结果初步揭示了黄土地貌流域系统骨架线的空间展布格局特征,为区域地貌研究时分析尺度的选取,提供了可借鉴的思路与方法。The spatial pattern of geographical objects has been one of the most important issues in the geomorphological research.Two major themes of it,the organizational structure and characteristic scale range of spatial object,play significant roles in the geo-surface processing and mechanism modeling.However,these problems have not yet been properly solved up to now.This is an exploring research on the issues proposed above.Feature lines,which mainly include ridge lines and hollow lines of terrain,are controlling factor of the geomorphologic forms.In recent years,with the development of the nonlinear science,fractal theory propose possible methods for depicting the spatial pattern of watershed feature lines.However,different spatial pattern of feature lines may be evaluated for the same fractal dimension value.Thus,it is not sufficient to depict spatial pattern only by using the fractal dimension indicator.The lacunarity analysis method,which developed on the basis of fractal theory,surmounts the weakness of the fractal indicator.Previous research has confirmed that one lacunarity curve correspond to one kind of spatial pattern uniquely.Besides,the organizational structure and the multi-scale characteristic of spatial objects can be studied by the configuration of the lacuarity curves and 3TLQV curves which is a derivative algorithm of lacuarity respectively.Thus the lacunarity analysis method is a reasonable complementarity for the Digital Terrain Analysis theory.In this paper,The Lacunarity analysis method,which is one of mature analysis methods in landscape ecology,is presented and discussed,by introducing its principle,arithmetic and feasibility in digital terrain analysis firstly.Using Jiu Yuan-gou drainage in northern Shaanxi hilly-gully area as the test site and 5m-resolution DEMs as original test data,the features lines of the watershed are studied by using of lacunarity and 3TLQV（Three-Term Local Quadrat Variance） methods.The spatial pattern of the drainage features lines is illustrated in the direction of

关 键 词：谷脊线 空间格局 空隙度 DEM 

分 类 号：P931[天文地球—自然地理学]