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Title

Advective Heat Transport in Frozen Rock Clefts: Conceptual Model, Laboratory Experiments and Numerical Simulation

Publication Year

2011

Author(s)
  • Hasler, Andreas
  • Gruber, Stephan
  • Font, Marianne
  • Dubois, Anthony
Source
PERMAFROST AND PERIGLACIAL PROCESSES Volume: 22 Issue: 4 Pages: 378-389 Published: 2011
ISSN
1045-6740
Abstract

Advective heat transported by water percolating into discontinuities in frozen ground can rapidly increase temperatures at depth because it provides a thermal shortcut between the atmosphere and the subsurface. Here, we develop a conceptual model that incorporates the main heat-exchange processes in a rock cleft. Laboratory experiments and numerical simulations based on the model indicate that latent heat release due to initial ice aggradation can rapidly warm cold bedrock and precondition it for later thermal erosion of cleft ice by advected sensible heat. The timing and duration of water percolation both affect the ice-level change if initial aggradation and subsequent erosion are of the same order of magnitude. The surplus advected heat is absorbed by cleft ice loss and runoff from the cleft so that this energy is not directly detectable in ground temperature records. Our findings suggest that thawing-related rockfall is possible even in cold permafrost if meltwater production and flow characteristics change significantly. Advective warming could rapidly affect failure planes beneath large rock masses and failure events could therefore differ greatly from common magnitude reaction-time relations. Copyright (C) 2011 John Wiley & Sons, Ltd.

Author Keyword(s)
  • bedrock
  • permafrost
  • advective heat transport
  • conductive heat transfer
  • laboratory experiment
  • numerical modelling
  • rockfall
  • climate change
KeyWord(s) Plus
  • PERMAFROST SITE
  • ACTIVE LAYER
  • FLOW
  • CLIMATE
  • ALPS
ESI Discipline(s)
  • Environment/Ecology
  • Geosciences
Web of Science Category(ies)
  • Geography, Physical
  • Geology
Adress(es)

[Hasler, Andreas; Gruber, Stephan] Univ Zurich, Dept Geog, CH-8057 Zurich, Switzerland; [Font, Marianne; Dubois, Anthony] Univ Caen Basse Normandie, Lab M2C, UMR CNRS INSU, Caen, France

Reprint Adress

Hasler, A (reprint author), Univ Zurich, Dept Geog, Winterthurerstr 190, CH-8057 Zurich, Switzerland.

Country(ies)
  • France
  • Switzerland
CNRS - Adress(es)
  • Laboratoire de Morphodynamique continentale et côtière (M2C), UMR6143
Accession Number
WOS:000298590100008
uid:/QK7245H4
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