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Monitoring tropical debris-covered glacier dynamics from high-resolution unmanned aerial vehicle photogrammetry, Cordillera Blanca, Peru

Wigmore, Oliver ; Mark, Bryan

The cryosphere, 2017-11, Vol.11 (6), p.2463-2480

Katlenburg-Lindau: Copernicus GmbH

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Título:
Monitoring tropical debris-covered glacier dynamics from high-resolution unmanned aerial vehicle photogrammetry, Cordillera Blanca, Peru
Autor: Wigmore, Oliver ; Mark, Bryan
Assuntos: Ablation ; Aerial photogrammetry ; Aerial photography ; Aerial surveying ; Aerial surveys ; Analysis ; Cliffs ; Climate change ; Climatic changes ; Cloud cover ; Customization ; Datasets ; Debris ; Digital Elevation Models ; Dynamics ; Environmental aspects ; Glacial drift ; Glacial dynamics ; Glacial lake outburst floods ; Glacial lakes ; Glacier ice ; Glacier melting ; Glacier retreat ; Glacier tongues ; Glacier velocities ; Glaciers ; Ground ice ; High altitude ; High resolution ; Ice ; Lake sediments ; Lidar ; Low cost ; Meltwater ; Monitoring ; Mountain glaciers ; Mountains ; Observations ; Photogrammetry ; Ponds ; Properties ; Remote control ; Remote sensing ; Researchers ; Resolution ; Satellite data ; Satellites ; Sediments ; Software ; Spatial discrimination ; Spatial resolution ; Studies ; Surface velocity ; Tropical climate ; Unmanned aerial vehicles ; Velocity ; Water quality
É parte de: The cryosphere, 2017-11, Vol.11 (6), p.2463-2480
Descrição: 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 (4000–6000 m a. 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.
Editor: Katlenburg-Lindau: Copernicus GmbH
Idioma: Inglês

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Monitoring tropical debris-covered glacier dynamics from high-resolution unmanned aerial vehicle photogrammetry, Cordillera Blanca, Peru

Wigmore, Oliver ; Mark, Bryan

Katlenburg-Lindau: Copernicus GmbH

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