Relations between Frost-pillars Growth and Pysical Property of Soil

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  • 霜柱の生長と土壌の物理性との関係
  • シモバシラ ノ セイチョウ ト ドジョウ ノ ブツリセイ ト ノ カンケイ

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Abstract

The physical parameters of the soil was studied in order to learn the conditions under which soil particles supply water to the base of the frost pillars. For this purpose, nine samples of microscopic particles (quartz and sand)-each sample differing in size of diameters, ranging from smallest to largest-and a sample of the Kanto loam, containing microscopic particles of varying diameters, were prepared.<BR>These samples were each saturated with a varying amount of water, respectively. And then quartz powder with particle sizes in the range of 1-4 microns were lightly scattered over them. These samples were observed under refrigeration in order to ascertain the conditions under which frost pillars develop.<BR>The result indicates that frost pillars are generated when the soil is fully saturated with water and when the soil's pF=1. The minimum amount of soil water required for generating the frost pillars is that amount when the soil-water diffusivity is 0. 003cm2/sec.

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