Relation between compressive viscosity and density of low-density snow.

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  • ENDO Yasoichi
    Tohkamachi Experiment Station, Forestry and Forest Products Research Institute
  • OHZEKI Yosio
    Tohkamachi Experiment Station, Forestry and Forest Products Research Institute
  • NIWANO Syouji
    Tohkamachi Experiment Station, Forestry and Forest Products Research Institute

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  • 低密度の雪の圧縮粘性係数と密度の関係
  • テイ ミツド ノ ユキ ノ アッシュク ネンセイ ケイスウ ト ミツド ノ カ

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Abstract

Compressive viscosity of snow with densities less than 180kg/m3 was measured at Tohkamachi, 1988. The relation between compressive viscosity η/ and snow density ρ was found to be expressed by<BR>η= Cρn.<BR>Although the value of C scattered considerably from 0.193 to 0.794 N.s.m-2 (m3/kg) m, the power n showed almost the constant value 4.00. Relations between η and ρ obtained by several previous researchers were also expressed by the form of power equation for snow with densities less than 300kg/m3. Based on the above equation, the variation of snow density with time was derived as follows : <BR>ρ (t, ti) = {(n/C) Q (t, ti) + ρ0n} 1/n, <BR>where ρ (t, ti) is the density at time t of ti-layer (deposited at time ti), ρ0 the initial density of ti-layer, Q (t, ti) the integrated normal stress which acted perpendicularly to ti-layer from ti to t. The equation was used for computing theoretically the depth of snow cover and the depth-density profile from the observed daily amount of precipitated snow. The calculated results were found to be in good agreements with the data observed at Tohkamachi.

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