Besiberris glacigenic rock glacier (Central Pyrenees, Spain) : mapping surface horizontal and vertical movement (1993-2003)

Authors

  • J. Chueca Cía Universidad de Zaragoza
  • A. Julián Andrés Universidad de Zaragoza

DOI:

https://doi.org/10.18172/cig.1254

Keywords:

Rock glacier, movement cartography, Pyrenees

Abstract

A ten-year (1993-2003) geodetic survey was conducted at the Besiberris rock glacier, a tongue-shaped, glacigenic rock glacier, located in the eastern-central Spanish Pyrenees (42º35'48''N, 0º49'20''E). Displacement measurements were made on three traverse lines across the rock glacier and mapped by geostatistical kriging interpolation methods. Surface horizontal velocity increases from the head to the toe sectors (average values: traverse line A = 8.72 cm yr-1; line B = 10.65 cm yr-1; line C = 13.35 cm yr-1). Velocities are greater at the axis of the rock glacier compared to its lateral margins. In terms of vertical movement, the rock glacier has shown clear thinning of an ice-core. In all three traverse lines, surface lowering has been detected (average values: line A = 5.00 cm yr-1; line B = 7.10 cm yr-1; line C = 5.27 cm yr-1). This general lowering is interpreted as the adjustement of the rock glacier to the climatic amelioration (higher temperature, drier conditions and reduced snowfall) observed in the Pyrenean region since the end of the Little Ice Age and accentuated in the last few decades.

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Published

03-06-2013

How to Cite

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Chueca Cía J, Julián Andrés A. Besiberris glacigenic rock glacier (Central Pyrenees, Spain) : mapping surface horizontal and vertical movement (1993-2003). CIG [Internet]. 2013 Jun. 3 [cited 2024 Mar. 29];37(2):7-24. Available from: https://publicaciones.unirioja.es/ojs/index.php/cig/article/view/1254

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