<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:creator>Wicky, Jonas</dc:creator>
  <dc:creator>Hauck, Christian</dc:creator>
  <dc:date>2017-06-06</dc:date>
  <dc:description xmlns:ns0="xml" ns0:lang="en">Talus slopes are a widespread geomorphic feature in the Alps. Due to their high  porosity a gravity-driven internal air circulation can be established which is forced by  the gradient between external (air) and internal (talus) temperature. The thermal  regime is different from the surrounding environment, leading to the occurrence of  permafrost below the typical permafrost zone. This phenomenon has mainly been  analysed by field studies and only few explicit numerical modelling studies exist.  Numerical simulations of permafrost sometimes use parameterisations for the effects  of convection but mostly neglect the influence of convective heat transfer in air on the  thermal regime. In contrast, in civil engineering many studies have been carried out to  investigate the thermal behaviour of blocky layers and to improve their passive cooling  effect. The present study further develops and applies these concepts to model heat  transfer in air flows in a natural-scale talus slope. Modelling results show that  convective heat transfer has the potential to develop a significant temperature  difference between the lower and the upper parts of the talus slope. A seasonally  alternating chimney-effect type of circulation develops. Modelling results also show  that this convective heat transfer leads to the formation of a cold reservoir in the lower  part of the talus slope, which can be crucial for maintaining the frozen ground  conditions despite increasing air temperatures caused by climate change.</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>https://folia.unifr.ch/global/documents/305984</dc:identifier>
  <dc:identifier>https://folia.unifr.ch/documents/305984/files/hau_nmc.pdf</dc:identifier>
  <dc:identifier>https://folia.unifr.ch/documents/305984/files/hau_nmc_sm.pdf</dc:identifier>
  <dc:language>eng</dc:language>
  <dc:relation>info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-11-1311-2017</dc:relation>
  <dc:rights>info:eu-repo/semantics/openAccess</dc:rights>
  <dc:rights>License undefined</dc:rights>
  <dc:source>The Cryosphere. - 2017, vol. 11, no. 3, p. 1311–1325</dc:source>
  <dc:subject>info:eu-repo/classification/udc/556</dc:subject>
  <dc:title xmlns:ns1="xml" ns1:lang="en">Numerical modelling of convective heat transport by air flow in permafrost talus slopes</dc:title>
  <dc:type>http://purl.org/coar/resource_type/c_6501</dc:type>
</oai_dc:dc>