| 黄土丘陵地形谷脊线展布特征 |
| |
| 引用本文： | 周毅,汤国安,张婷,罗明良,贾旖旎.黄土丘陵地形谷脊线展布特征[J].干旱区地理,2010,33(1). |
| |
| 作者姓名： | 周毅 汤国安 张婷 罗明良 贾旖旎 |
| |
| 作者单位： | 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;南京师范大学虚拟地理环境教育部重点实验室,南京,210046 |
| |
| 基金项目： | 国家青年科学基金，国家高技术研究发展计划(863计划) |
| |
| 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、2 100 m、4 845 m;南北方向上尺度范围分别为1 215 m、2 810 m、5 700 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.
|
| 关 键 词： | 谷脊线 空间格局 空隙度 DEM |
Spatial pattern of terrain feature lines of Loess gully-hill region |
| |
| Abstract: | The spatial pattern of geographical objects has been one of the most important issues in the geomorpho-logical research. Two major themes of it, the organizational structure and characteristic scale range of spatial ob-ject, 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 di-mension 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 ob-jects 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 land-scape ecology, is presented and discussed, by introducing its principle, arithmetic and feasibility in digital terrain analysis firstly. Using Jiu Yuan - gou drainage in northern Sbaanxi hilly - gully area as the test site and 5m - reso-lution 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 analy-sis 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 - organi-zing 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 ba-sin in the loess hilly -gully region, and it also provide a reference for choosing the analysis scale in regional land-form study. |
| |
| Keywords: | spatial pattern lacunarity digital elevation model feature lines |
| 本文献已被 万方数据 等数据库收录！ |
|
