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| 1 | 黄土高原沟蚀区地表蚕食度空间分布特征和影响因素研究显示文摘In China’s Loess Plateau severe gully erosion(LPGE)region,the shoulder-line is the most intuitive and unique manifestation of the loess landform,which divides a landform into positive and negative terrains(PNTs).The spatial combination model of PNTs is of great significance for revealing the evolution of the loess landform.This study modeled and proposed the Surface Nibble Degree(SND),which is a new index that reflects the comparison of the areas of PNTs.Based on 5 m DEMs and matched high-resolution remote sensing images,the PNTs of 164 complete watersheds in the LPGE were extracted accurately,and the SND index was calculated.The spatial distribution trend of SND was discussed,and the relationship between SND and the factors that affect the evolution mechanism of regional landform was explored further.Results show that:(1)The SND can be calculated formally.It can quantify the development of the loess landform well.(2)The SND of the LPGE has evident spatial differentiation that increases from southwest to northeast.High values appear in Shenmu of Shaanxi,Shilou of Shanxi,and northern Yanhe River,whereas the low values are mainly distributed in the southern loess tableland and the inclined elongated ridge area of Pingliang in Gansu and Guyuan in Ningxia.(3)In the Wuding River and Yanhe River,the SND decreases with the increase in flow length(FL).In the North-Luohe River and Jinghe River,the SND increases with FL.(4)SND is significantly correlated with gully density and sediment modulus and moderately correlated with hypsometric integral.As for the mechanism factors analysis,the relationship between loess thickness and SND is not obvious,but SND increased first and then decreased with the increase of precipitation and vegetation in each geographical division,and we found that the land use type of low coverage grassland has greater erosion potential. | 周毅 杨彩勤 李凡 陈荣 | 2021 | Journal of Geographical Sciences2021，31，11： | 4 |
| 2 | 基于EEMD-瞬时频率变换的黄土高原典型地貌沟蚀活跃区识别研究显示文摘黄土沟谷是黄土高原物质和能量交换最频繁、形态和形状变化最剧烈的区域。黄土沟沿线作为沟蚀的重要地形特征线,是研究黄土沟蚀特征的重要切入点。该文以黄土峁区(窑家湾)、黄土梁区(安塞)和黄土塬区(长武)3个典型小流域为研究样区,以低空摄影测量生成的1 m分辨率DEM为实验数据,采用集合经验模态分解(EEMD)-瞬时频率变换方法分析各样区黄土沟沿线地形剖面的变化特征。结果表明,黄土高原不同地貌类型区沟沿线地形剖面变化特征差异明显,各样区的沟蚀活跃区多分布于沟头,沟蚀方式以沟头的溯源侵蚀最为活跃,反映了黄土高原地貌的发育进程和沟蚀活跃性,3个样区中黄土梁区(安塞)的沟蚀和沟谷发育最活跃,与实地调查结果一致。 | 陈琦 曹建军 汤国安 刘永娟 方炫 朱莹 李金莲 | 2021 | 地理与地理信息科学2021，37，3： | 2 |
| 3 | Regional features of topographic relief over the Loess Plateau,China:evidence from ensemble empirical mode decomposition显示文摘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 variation.In 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 features.This technique provides a new perspective for understanding the macro characteristics and differentiation patterns of loess landforms.We 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)data.These profiles were subjected to temporal-frequency analysis using the ensemble empirical mode decomposition(EEMD)method.The 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 north.According to the TRPs and topographic relief characteristics,the topographic relief of the Loess Plateau was divided into four types that have obvious regional differences.The findings of this study enrich the theories and methods for digital terrain data analysis of the Loess Plateau.Future study should undertake a more in-depth investigation regarding the complexity of the region and to address the limitations of the EEMD method. | Yongjuan Liu Jianjun Cao Liping Wang Xuan Fang Wolfgang Wagner | 2020 | Frontiers of Earth Science2020，14，4： | 1 |
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