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  4. 山地灾害与地表过程重点实验室
Analysis of Hillslope Erosion Based on Excess Topography in Southeastern Tibet

文献类型：期刊论文

作者Liu, Weiming4,5; Zhou, Zhen3; Zhou, Liqin2,5; Chen, Xiaoqing4,5; Yanites, Brian1; Zhou, Yanlian2,5; Li, Xuemei5; Zhang, Xiaogang5
刊名FRONTIERS IN EARTH SCIENCE
出版日期2021-07-26
卷号9页码:8
ISSN号无
关键词excess topography landslides hillslope erosion potential landslides southeastern Tibet
DOI10.3389/feart.2021.684365
英文摘要The southeastern Tibetan Plateau has been deeply dissected by major rivers and their tributaries into high-relief topography with deep gorges. In this region, most hillslope gradients in the high-relief areas approach a threshold value, and landslides are the dominant surface erosion process. For this work, we analyzed the hillslope erosion process by determining the excess topography from the threshold hillslope. Slope analysis found a similar normal distribution of slope values for six large drainage basins with different lithology, precipitation, and tectonic settings. Overall, 82% of the slopes in our study area were 30 +/- 5 degrees, so this was taken as a reasonable range of threshold hillslope angles. We determined that the excess topography calculated for different threshold values all occur along major fluvial inner gorges. We found a linear relationship between excess topography and the mean erosion rate in drainage basins, which indicates that hillslope erosion, especially landslides, is the main erosion process. In contrast, the correlation between excess topography and the slope is only found for low-relief topography. This suggests that excess topography is a better metric than the slope to reflect the spatial distribution of erosion rates in the southeastern Tibetan Plateau. In addition, for a threshold value of 30 degrees, we collected data from 4,430 landslides and found that 71% of these landslides had occurred in an area of excess topography. This implies that most recent landslides did not reduce the slope below the threshold value. As a result, the potential for future landslides remains high in areas where landslides have recently occurred.
WOS关键词2008 WENCHUAN EARTHQUAKE ; THRESHOLD HILLSLOPES ; LANDSCAPE EVOLUTION ; TRANSIENT LANDSCAPE ; LARGE LANDSLIDES ; EASTERN MARGIN ; MOUNTAIN ; PATTERN ; SICHUAN ; RELIEF
资助项目National Natural Science Foundation of China[41941017] ; National Natural Science Foundation of China[42071017] ; National Natural Science Foundation of China[41771023] ; National Natural Science Foundation of China[41807448]
WOS研究方向Geology
语种英语
出版者FRONTIERS MEDIA SA
WOS记录号WOS:000682905600001
资助机构National Natural Science Foundation of China
源URL[http://ir.imde.ac.cn/handle/131551/56263]  
专题成都山地灾害与环境研究所_山地灾害与地表过程重点实验室
通讯作者Chen, Xiaoqing
作者单位1.Indiana Univ, Earth & Atmospher Sci, Bloomington, IN USA
2.Univ Chinese Acad Sci, Beijing, Peoples R China
3.China Railway Eryuan Engn Grp Co Ltd, Chengdu, Peoples R China
4.CAS HEC, China Pakistan Joint Res Ctr Earth Sci, Islamabad, Pakistan
5.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Hazards & Surface Proc, Chengdu, Peoples R China
推荐引用方式
GB/T 7714		 Liu, Weiming,Zhou, Zhen,Zhou, Liqin,et al. Analysis of Hillslope Erosion Based on Excess Topography in Southeastern Tibet[J]. FRONTIERS IN EARTH SCIENCE,2021,9:8.
APA Liu, Weiming.,Zhou, Zhen.,Zhou, Liqin.,Chen, Xiaoqing.,Yanites, Brian.,...&Zhang, Xiaogang.(2021).Analysis of Hillslope Erosion Based on Excess Topography in Southeastern Tibet.FRONTIERS IN EARTH SCIENCE,9,8.
MLA Liu, Weiming,et al."Analysis of Hillslope Erosion Based on Excess Topography in Southeastern Tibet".FRONTIERS IN EARTH SCIENCE 9(2021):8.

入库方式： OAI收割

来源：成都山地灾害与环境研究所

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