Scale characters analysis for gully structure in the watersheds of loess landforms based on digital elevation models
Scale characters analysis for gully structure in the watersheds of loess landforms based on digital elevation models作者机构：College of Geometries Shandong University of Science and Technology Qingdao 266590 China College of Computer Science and Engineering Shandong University of Science andTechnology Qingdao 266590 China
出 版 物：《Frontiers of Earth Science》 (地球科学前沿（英文版）)
年 卷 期：2018年第12卷第2期
页 面：431-443页
核心收录：
学科分类：07[理学] 0708[理学-地球物理学] 0704[理学-天文学]
基 金：supported by the auspices of the National Natural Science Foundation of China
主 题：watershed scale features gully structure bifurcation ratio fractal dimension scale sequence
摘 要：Scale is the basic attribute for expressing anddescribing spatial entity and phenomena. It offerstheoretical significance in the study of gully structureinformation, variable characteristics of watershed mor-phology, and development evolution at different scales.This research selected five different areas in China＇s LoessPlateau as the experimental region and used DEM data atdifferent scales as the experimental data. First, the changerule of the characteristic parameters of the data at differentscales was analyzed. The watershed structure informationdid not change along with a change in the data scale. Thiscondition was proven by selecting indices of gullybifurcation ratio and fractal dimension as characteristicparameters of watershed structure information. Then, thechange rule of the characteristic parameters of gullystructure with different analysis scales was analyzed bysetting the scale sequence of analysis at the extractiongully. The gully structure of the watershed changed withvariations in the analysis scale, and the change rule wasobvious when the gully level changed. Finally, the changerule of the characteristic parameters of the gully structure atdifferent areas was analyzed. The gully fractal dimensionshowed a significant numerical difference in differentareas, whereas the variation of the gully branch ratio wassmall. The change rule indicated that the developmentdegree of the gully obviously varied in different regions,but the morphological structure was basically similar.
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