Influence of microstructure on effective thermal conductivity of snow cover composed of ice spheres.

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  • SATO Atsushi
    Shinjo Branch of Snow and Ice Studies, National Research Institute for Earth Science and Disaster Prevention
  • ADAMS Edward E.
    Department of Civil Engineering, Montana State University Bozeman

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  • モデル積雪の微細構造と有効熱伝導率
  • モデル セキセツ ノ ビサイ コウゾウ ト ユウコウ ネツ デンドウリツ

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Abstract

A dry snow cover composed of uniform ice spheres is modeled to examine the contribution of microstructure to thermal processes in the snow cover. Three types of heat transfer are calculated ; heat conduction through the ice bond netwrok, water vapor flux across the pore space, and conduction in the pore.<BR>Conduction through the ice bond network is determined to be the most important mechanism for sintered snow, however for poorly bonded ice granins the vapor transport contribution is significant and in the extreme case may dominate. The thermal conductivity is calculated to increase with snow density and with an increase in the ratio of the bond radius to the sphere radius. The relative contribution due to vapor transport decreases with decreasing temperature. Conductivity varies little with temperature when the ratio of hond/sphere radius is small, but in the case of a large ratio conductivity increases with decreasing temperature due to the strong dependance on the ice constituent. Conduction of heat in the pore is negligible.<BR>It is shown that the effective thermal conductivity of snow has a strong dependence on the bond/sphere ratios (microstructure), density, and temperature. The importance of the role of microstructure is ascertained.

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