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地表过程解析与调控是保障人与自然和谐相处的重要途径,高效、合理地划分地表过程响应单元则是开展地表过程研究的重要前提。针对黄土丘陵沟壑区土壤侵蚀的地形地貌分异特征,提出在小流域内以沟谷线、山脊线、分水线和沟缘线相互交叠,构成具有相对均一坡向、坡度与坡位的地表过程响应单元,在ArcGIS9.2中,以Hc-DEM为基础数据,通过确定沟谷线、山脊线、分水线和沟缘线的提取方法,以及响应单元平均坡度、整体坡向、面积与周长等地形特征的测算技术,实现地表过程响应单元的快速划分及其地形特征的高效提取。研究结果对促进黄土丘陵沟壑区以土壤侵蚀为代表的地表过程研究具有重要的基础意义。
The analysis and regulation of surface processes are an important way to ensure the harmonious coexistence between man and nature. It is an important precondition to carry out the research of surface processes that the surface process response units are divided efficiently and reasonably. According to the topographic and landform characteristics of soil erosion in the gully region of the Loess Plateau, it is proposed that the valley, ridge line, watershed and ditch line overlap each other in the small watershed to form a surface with relatively uniform slope, slope and slope The process response unit, based on the Hc-DEM data in ArcGIS 9.2, adopted the method of extracting the valley lines, ridgelines, watersheds and ditches, and the average gradient of the response units. The overall slope, area and weeks Long and other topographic features of the measurement techniques to achieve rapid response of surface processes and the rapid division of the topographic features of the efficient extraction. The results of this study are of great importance to the study of the surface processes represented by soil erosion in the hilly and gully regions of the Loess Plateau.