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• W2275658840 abstract "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 north to south and east to west respectively by the configuration of the lacunarity and 3TLQV analysis curves.Results show that they are slightly concave curves of the lacunarity and they have high fitting degree with the straight line.This phenomenon indicates that the configuration of the drainage feature lines is self-organizing and self-similar.The similarity between the lacunarity curves of the ridge lines and hollow lines illustrates that the anisotropy character of the drainage landform is not obvious.Because of better consistency of the hollow lines,the lacunarity value of hollow lines is a little higher than that of the ridge lines.Meanwhile,the 3TLQV curves of the feature lines have three peak points in the two directions respectively.This means that there are three characteristic scale ranges in the drainage basin.They are 540m,2100m and 4845m in EW direction and 1215m,2810m and 5700m in NS direction.This is an initial experiment for revealing the spatial pattern of the drainage basin in the loess hilly-gully region,and it also provide a reference for choosing the analysis scale in regional landform study." @default.
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• W2275658840 date "2010-01-01" @default.
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• W2275658840 title "Spatial pattern of terrain feature lines of Loess gully-hill region." @default.
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