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Volume 11, issue 6 | Copyright
The Cryosphere, 11, 2463-2480, 2017
https://doi.org/10.5194/tc-11-2463-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 03 Nov 2017

Research article | 03 Nov 2017

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

Oliver Wigmore1,2,3,4 and Bryan Mark1,2 Oliver Wigmore and Bryan Mark
  • 1Department of Geography, Ohio State University, Columbus, OH, USA
  • 2Byrd Polar and Climate Research Center, Ohio State University, Columbus, OH, USA
  • 3Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO, USA
  • 4Earth Lab, University of Colorado Boulder, Boulder, CO, USA

Abstract. 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 (4000–6000m 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 (5cm) and digital elevation models (DEMs) (10cm) 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.

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Using a drone custom built for high altitude flight (4000–6000 m) we completed repeat surveys of Llaca Glacier in the Cordillera Blanca, Peru. Analysis of high resolution imagery and elevation data reveals highly heterogeneous patterns of glacier change and the important role of ice cliffs in glacier melt dynamics. Drones are found to provide a viable and potentially transformative method for studying glacier change at high spatial resolution, on demand and at relatively low cost.
Using a drone custom built for high altitude flight (4000–6000 m) we completed repeat surveys of...
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