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SURFACE TEMPERATURES CALCULATION METHOD FOR HIGH ALBEDO ROAD SURFACES IN PERMAFROST REGIONS
Session: Embankments and Dams in Cold Regions / Remblais et barrages en régions nordiques
Simon Dumais, Département de génie civil et Centre d'études nordiques, Université Laval (Canada)
Guy Doré, Département de génie civil, Université Laval (Canada)
High albedo road surfaces can be used to reduce heat absorption in order to limit the degradation of the permafrost under paved embankments. A method is proposed to calculate the surface temperature pavements in permafrost regions. First, several practical methods to determine the albedo of the pavement are presented. Second, the required climatic data to use the model are discussed. A method to calculate the incoming solar radiation is presented. Then, an albedo based model using a simplified energy balance at the surface of the pavement is used to calculate the radiation index and surface temperature of the pavement. Finally, an index based on Stefan equation is proposed to assess the effectiveness of high albedo surfaces for the mitigation of permafrost degradation. Two working examples are also presented for Beaver Creek, Yukon and Iqaluit, Nunavut.
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