DOI: 10.5194/tc-11-2463-2017
Scopus记录号: 2-s2.0-85021115181
论文题名: Monitoring tropical debris-covered glacier dynamics from high-resolution unmanned aerial vehicle photogrammetry, Cordillera Blanca, Peru
作者: Wigmore O ; , Mark B
刊名: Cryosphere
ISSN: 19940416
出版年: 2017
卷: 11, 期: 6 起始页码: 2463
结束页码: 2480
语种: 英语
英文关键词: glacial debris
; glacial lake
; glacier dynamics
; lidar
; melting
; meltwater
; monitoring
; outburst
; photogrammetry
; proglacial environment
; satellite data
; unmanned vehicle
; Ancash
; Cordillera Blanca
; Cordillera Occidental [Peru]
; Peru
英文摘要: The glaciers of the Cordillera Blanca, Peru, are rapidly retreating and thinning as a result of climate change, altering the timing, quantity and quality of water available to downstream users. Furthermore, increases in the number and size of proglacial lakes associated with these melting glaciers is increasing potential exposure to glacier lake outburst floods (GLOFs). Understanding how these glaciers are changing and their connection to proglacial lake systems is thus of critical importance. Most satellite data are too coarse for studying small mountain glaciers and are often affected by cloud cover, while traditional airborne photogrammetry and lidar are costly. Recent developments have made unmanned aerial vehicles (UAVs) a viable and potentially transformative method for studying glacier change at high spatial resolution, on demand and at relatively low cost. Using a custom designed hexacopter built for high-altitude (4000-6000ma.s.l.) operation, we completed repeat aerial surveys (2014 and 2015) of the debris-covered Llaca Glacier tongue and proglacial lake system. High-resolution orthomosaics (5 cm) and digital elevation models (DEMs) (10 cm) were produced and their accuracy assessed. Analysis of these datasets reveals highly heterogeneous patterns of glacier change. The most rapid areas of ice loss were associated with exposed ice cliffs and meltwater ponds on the glacier surface. Considerable subsidence and low surface velocities were also measured on the sediments within the pro-glacial lake, indicating the presence of extensive regions of buried ice and continued connection to the glacier tongue. Only limited horizontal retreat of the glacier tongue was observed, indicating that measurements of changes in aerial extent alone are inadequate for monitoring changes in glacier ice quantity. © 2017 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75487
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Department of Geography, Ohio State University, Columbus, OH, United States; Byrd Polar and Climate Research Center, Ohio State University, Columbus, OH, United States; Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO, United States; Earth Lab, University of Colorado Boulder, Boulder, CO, United States
Recommended Citation:
Wigmore O,, Mark B. Monitoring tropical debris-covered glacier dynamics from high-resolution unmanned aerial vehicle photogrammetry, Cordillera Blanca, Peru[J]. Cryosphere,2017-01-01,11(6)