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首页> 外文期刊>Frontiers of earth science >Scale characters analysis for gully structure in the watersheds of loess landforms based on digital elevation models
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Scale characters analysis for gully structure in the watersheds of loess landforms based on digital elevation models

机译：基于数字高程模型的黄土地貌流域沟壑结构尺度特征分析

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摘要

Scale is the basic attribute for expressing and describing spatial entity and phenomena. It offers theoretical significance in the study of gully structure information, variable characteristics of watershed morphology, and development evolution at different scales. This research selected five different areas in China's Loess Plateau as the experimental region and used DEM data at different scales as the experimental data. First, the change rule of the characteristic parameters of the data at different scales was analyzed. The watershed structure information did not change along with a change in the data scale. This condition was proven by selecting indices of gully bifurcation ratio and fractal dimension as characteristic parameters of watershed structure information. Then, the change rule of the characteristic parameters of gully structure with different analysis scales was analyzed by setting the scale sequence of analysis at the extraction gully. The gully structure of the watershed changed with variations in the analysis scale, and the change rule was obvious when the gully level changed. Finally, the change rule of the characteristic parameters of the gully structure at different areas was analyzed. The gully fractal dimension showed a significant numerical difference in different areas, whereas the variation of the gully branch ratio was small. The change rule indicated that the development degree of the gully obviously varied in different regions, but the morphological structure was basically similar.
机译：比例尺是表达和描述空间实体和现象的基本属性。它在研究沟渠结构信息，流域形态的可变特征以及不同规模的发展演化方面具有理论意义。本研究选择了中国黄土高原的五个不同区域作为实验区域，并以不同规模的DEM数据作为实验数据。首先，分析了不同尺度下数据特征参数的变化规律。分水岭结构信息没有随数据规模的变化而变化。通过选择沟壑分叉比和分形维数作为分水岭结构信息的特征参数，证明了这一条件。然后，通过设置提取沟的分析尺度顺序，分析了不同分析尺度的沟结构特征参数的变化规律。流域的沟壑结构随分析尺度的变化而变化，当沟壑水位发生变化时，变化规律明显。最后，分析了不同区域沟壑结构特征参数的变化规律。沟壑分形维数在不同区域表现出明显的数值差异，而沟壑分支比的变化很小。变化规律表明，不同区域的沟壑发育程度明显不同，但其形态结构基本相似。

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