气候变化领域集成服务门户(CCPortal): Multi-decadal geomorphic changes of a low-angle valley glacier in the East Kunlun Mountains: remote sensing observations and detachment hazard assessment

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DOI	10.5194/nhess-21-2791-2021
	Multi-decadal geomorphic changes of a low-angle valley glacier in the East Kunlun Mountains: remote sensing observations and detachment hazard assessment
	Wang, Xiaowen; Liu, Lin; Hu, Yan; Wu, Tonghua; Zhao, Lin; Liu, Qiao; Zhang, Rui; Zhang, Bo; Liu, Guoxiang
通讯作者	Wang, XW (通讯作者)，Southwest Jiaotong Univ, Fac Geosci & Environm Engn, Chengdu, Peoples R China. ; Wang, XW (通讯作者)，Southwest Jiaotong Univ, State Prov Joint Engn Lab Spatial Informat Techno, Chengdu, Peoples R China.
发表日期	2021
ISSN	1561-8633
EISSN	1684-9981
起始页码	2791
结束页码	2810
卷号	21 期号:9
英文摘要	Detachments of large parts of low-angle mountain glaciers in recent years have raised great attention due to their threats to lives and properties downstream. While current studies have mainly focused on post-event analysis, a few opportunities have presented themselves to assess the potential hazards of a glacier prone to detachment. Here we present a comprehensive analysis of the dynamics and runout hazard of a low-angle (similar to 20 degrees) valley glacier, close to the Qinghai-Tibet railway and highway, in the East Kunlun Mountains on the Qinghai-Tibet Plateau. The changes in morphology, terminus position, and surface elevation of the glacier between 1975 and 2021 were characterized with a stereo-image pair from the historical KH-9 spy satellite, six digital elevation models (DEMs), and 11 high-resolution images from Planet Labs. The surface flow velocities of the glacier tongue between 2009 and 2020 were also tracked based on cross-correlation of Planet images. Our observations show that the glacier snout has been progressively advancing in the past 4 decades, with a stepwise increase in advance velocity from 4.55 +/- 0.46 ma(-1) between 1975 and 2009 to 30.88 +/- 2.36 ma(-1) between 2015 and 2020. DEM differencing confirms the glacial advance, with surface thinning in the source region and thickening in the tongue. The net volume loss over the glacier tongue was about 11.21 +/- 2.66 x 10(5) m(3) during 1975-2018. Image cross-correlation reveals that the surface flow velocity of the glacier tongue has been increasing in recent years, with the mean velocity below 4800 m more than tripling from 6.3 +/- 1.8ma(-1) during 2009-2010 to 22.3 +/- 3.2 ma(-1) during 2019-2020. With a combined analysis of the geomorphic, climatic, and hydrologic conditions of the glacier, we suggest that the flow of the glacier tongue is mainly controlled by the glacier geometry, while the presence of an ice-dammed lake and a supraglacial pond implies a hydrological influence as well. Taking the whole glacier and glacier tongue as two endmember avalanche sources, we assessed the potential runout distances of these two scenarios using the angle of reach and the Voellmy-Salm avalanche model. The assessments show that the avalanche of the whole glacier would easily travel a distance that would threaten the safety of the railway. In contrast, the detachment of the glacier tongue would threaten the railway only with a small angle of reach or when employing a low-friction parameter in the Voellmy-Salm modeling.
关键词	NORTHERN TIEN-SHAN ELEVATION CHANGE SEPTEMBER 2002 KOLKA GLACIER ICE TIBET PERMAFROST INVENTORY AVALANCHE COLLAPSE
语种	英语
WOS研究方向	Geology ; Meteorology & Atmospheric Sciences ; Water Resources
WOS类目	Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences ; Water Resources
WOS记录号	WOS:000695657600001
来源期刊	NATURAL HAZARDS AND EARTH SYSTEM SCIENCES
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/255146
作者单位	[Wang, Xiaowen; Zhang, Rui; Zhang, Bo; Liu, Guoxiang] Southwest Jiaotong Univ, Fac Geosci & Environm Engn, Chengdu, Peoples R China; [Wang, Xiaowen; Zhang, Rui; Liu, Guoxiang] Southwest Jiaotong Univ, State Prov Joint Engn Lab Spatial Informat Techno, Chengdu, Peoples R China; [Liu, Lin; Hu, Yan] Chinese Univ Hong Kong, Fac Sci, Earth Syst Sci Programme, Hong Kong, Peoples R China; [Wu, Tonghua; Zhao, Lin] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Cryospher Sci, Cryosphere Res Stn Qinghai Tibet Plateau, Lanzhou, Peoples R China; [Zhao, Lin] Nanjing Univ Informat Sci & Technol, Sch Geog Sci, Nanjing, Peoples R China; [Liu, Qiao] Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu, Peoples R China
推荐引用方式 GB/T 7714	Wang, Xiaowen,Liu, Lin,Hu, Yan,et al. Multi-decadal geomorphic changes of a low-angle valley glacier in the East Kunlun Mountains: remote sensing observations and detachment hazard assessment[J]. 中国科学院西北生态环境资源研究院,2021,21(9).
APA	Wang, Xiaowen.,Liu, Lin.,Hu, Yan.,Wu, Tonghua.,Zhao, Lin.,...&Liu, Guoxiang.(2021).Multi-decadal geomorphic changes of a low-angle valley glacier in the East Kunlun Mountains: remote sensing observations and detachment hazard assessment.NATURAL HAZARDS AND EARTH SYSTEM SCIENCES,21(9).
MLA	Wang, Xiaowen,et al."Multi-decadal geomorphic changes of a low-angle valley glacier in the East Kunlun Mountains: remote sensing observations and detachment hazard assessment".NATURAL HAZARDS AND EARTH SYSTEM SCIENCES 21.9(2021).