黄土丘陵沟壑区不同坡度分级系统及地面坡谱对比

Slope Classification Systems and Their Slope Spectrum in Hill and Gully Area of the Loess Plateau

地面坡度是最重要的地形定量指标 ,建立科学合理的地面坡度分级体系是对坡度进行科学研究与坡度图制图必不可少的重要环节。总结了近年来在坡度分级研究方面的已有成果 ,将坡度分级方法归并为临界坡度分级、等差坡度分级、模糊坡度分级 3种方法。在说明了各种分类方法特点的基础上 ,探讨了其应用的适用性。以黄土丘陵沟壑区的韭园沟流域为实验样区 ,利用高精度 1∶ 1万比例尺的 DEM数据为信息源 ,建立了栅格数字坡度模型。利用分级统计的结果 。

Slope is the most important topographic variables. It is a critical work to establish a scientific and reasonable slope classification systems for terrain research and slope mapping. After a comprehensive summary to the previous works in this field, it is pointed out that slope classification scheme could be divided into three different types on the basis of their serving purpose, namely critical classification, equal interval classification and fuzzy classification. Their availability is analyzed after explaining the characteristics of the slope classifications. Taking Jiuyuangou area as the test area representing the loess hill gully terrain type, a digital slope model (DSM) was extracted from 1∶10 000 scaled DEMs. Different slope spectrums can be derived from DSMs according to the different slope classification systems, which shows a interesting discrepancy both in their distribution patterns and statistic values.