Regional features of topographic relief over the Loess Plateau,China:evidence from ensemble empirical mode decomposition
作者机构：School of Environment Science and Spatial InformaticsChina University of Mining and TechnologyXuzhou221116China School of Geography Science/Key Laboratory of Virtual Geographic Environment of Ministry of EducationNanjing Normal UniversityNanjing210023China School of Environmental ScienceNanjing Xiaozhuang UniversityNanjing211171China Department of Geodesy and GeoinformationVienna University of TechnologyVienna1040Austria
出 版 物：《Frontiers of Earth Science》 (地球科学前沿（英文版）)
年 卷 期：2020年第14卷第4期
页 面：695-710页
核心收录：
学科分类：070903[理学-古生物学与地层学(含：古人类学)] 0709[理学-地质学] 07[理学] 0708[理学-地球物理学] 0704[理学-天文学]
基 金：We are grateful for the support of the National Natural Science Foundation of China(Grant Nos.41930102 51974314 41671389 and 41871313)
主 题：catchment boundary profile topographic relief period ensemble empirical mode decomposition Loess Plateau
摘 要：Landforms with similar surface matter compositions,endogenic and exogenic forces,and development histories tend to exhibit significant degrees of self-similarity in morphology and spatial *** loess hill-gully areas,ridges and hills have similar topographic relief characteristics and present nearly periodic variations of similar repeating structures at certain spatial scales,which is termed the topographic relief period(TRP).This is a relatively new concept,which is different from the degree of relief,and describes the fluctuations of the terrain from both horizontal and vertical(cross-section)perspectives,which can be used for in-depth analysis of 2-D topographic relief *** technique provides a new perspective for understanding the macro characteristics and differentiation patterns of loess *** investigate TRP variation features of different landforms on the Loess Plateau,China,by extracting catchment boundary profiles(CBPs)from 5 m resolution digital elevation model(DEM)*** profiles were subjected to temporal-frequency analysis using the ensemble empirical mode decomposition(EEMD)*** results showed that loess landforms are characterized by significant regional topographic relief;the CBP of 14 sample areas exhibited an overall pattern of decreasing TRPs and increasing topographic relief spatial frequencies from south to *** to the TRPs and topographic relief characteristics,the topographic relief of the Loess Plateau was divided into four types that have obvious regional *** findings of this study enrich the theories and methods for digital terrain data analysis of the Loess *** study should undertake a more in-depth investigation regarding the complexity of the region and to address the limitations of the EEMD method.
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