On the movements and the supply of soil water caused by freezing

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  • 土壤凍結に伴う地中水の挙動と供給について
  • 土壌凍結に伴う地中水の挙動と供給について
  • ドジョウ トウケツ ニ トモナウ チチュウスイ ノ キョドウ ト キョウキュウ

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In this report, the author, having gained an empirical formula of relationship among electric resistance R, temperature T, and water content W of soil samples gathered from each examination site through a previous laboratory experiment, measured continuously with a self recorder the R and T of the soil in the region with pronounced repeated freezing and thawing cycles to dynamically determine the soil water level. As a result, with the occurrence and the growth of freezing in surface soil, the soil water in unfrozen soil moved gradually toward the frost line from the position close to the ground surface. The decrease of water content caused by the upward motion of water was less with the downward change of the position. Within the depth of 10 cm of frozen soil, the water content at the depth of 40 cm scarcely showed the variations of decrease. It was hence established that its soil water scarcely took part in freezing. Therefore, although it was generally said that the upward water was supplied from the great depth of underground soils, the author presumed that the frost heaving was sufficiently caused by the soil water within a limited depth from the frost line. In addition, when the frozen soil layer was fairly thick, the soil water of upper parts which thawed with rising of the temperature could not pass into the soil below the frost line because of freezing of the lower parts in the frozen soil layer; furthermore, in the process of re-freezing of its thawing water, it was not recognized that the soil water moved upwards in unfrozen soil.

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