Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 648, Issue -, Pages 218-235Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2018.07.460
Keywords
Debris-covered glacier; Rock glacier; Themokarst depressions; Digital photogrammetry; Boulder displacement; Elevation change; Trollaskagi peninsula; Iceland
Categories
Funding
- Spanish Ministry of Economy and Competitiveness [CGL2015-65813-R]
- Nils Mobility Program (EEA GRANTS)
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This paper analyses changes in the surface morphology of rock and debris-covered glaciers in the Holadalsjokull and Fremri-Grjotardalur cirques near Holar village in the Trollaskagi peninsula (northern Iceland) (65 degrees 43'55 '' N: 19 degrees 06'49 '' W, 160 m), to understand the dynamics and climatic significance of these landforms. The study includes an analysis of historical aerial photographs from 1946 to 2000. The aim was to evaluate surface changes in these landforms and obtain the horizontal displacement and elevation changes of large boulders and linear features (ridges and furrows) at each date. In addition, the surface elevation differences between 1980 and 1994 were obtained from digital elevation models. The horizontal displacement results obtain a mean velocity of 0.33 m yr(-1) and an average elevation difference of -0.72 m for the boulders, with the linear features advancing 14.84 m during the period 1946-2000. Except for this slow mobility, no changes occurred in the surface morphology of these landforms during the 54 years. The low displacement rates of boulders and linear features, together with the surface lowering processes observed in these landforms, indicate that widespread melting is the most important activity in the debris-covered and rock glaciers in Trollaskagi. This is confirmed by the recent formation of collapse depressions. (C) 2018 Elsevier B.V. All rights reserved.
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