Thaw Mechanism of Unsaturated Frozen Soil during Water Infiltration through a Macropore
M. Mizoguchi (1), N. Kondo (2)
(1) Department of Biological and Environmental Engineering, University of Tokyo
(2) Masterfs Program in Biological and Environmental Engineering, University of Tokyo
Freezing-thawing cycle of soil influences the hydrological processes in the permafrost region. If snowmelt water infiltrates into unsaturated frozen soil, the water will carry heat into the frozen soil and accelerate thawing of the soil. To investigate the effect of infiltration on thawing of frozen soil, we measured one-dimensional temperature profiles in the column of frozen dry sand during infiltration. As a result, temperature of frozen sand jumped to zero-degrees as soon as infiltration front reached and it remained at zero-degree for a while. In addtion, by using thermography we observed vertical temperature distribution around a macropore, which was artificially made in frozen dry sand, during infiltration. The temperature distribution revealed the mechanism that bypass flow through a macropore thawed frozen soil from the circumference of the macropore.
Submittal Information
Name :
Date :
Prof. Masaru MIZOGUCHI
31-May-01-15:07:12
Organization :
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Department of Biological and Environmental Engineering, University of Tokyo
