MODELING TEMPERATURE DISTRIBUTION IN SOIL PROFILE: IMPACTS OF MOISTURE TRANSPORT, SNOW COVER, AND SOIL FREEZING

摘要

Prediction of soil temperature is important to simulation of work environment of pavement withsignif icant earth contact. A one-dimensional numerical model for heat and moisture transfer in partiallyfrozen soils has been developed and validated. In addition to modeling conduction heat transfer, modelvariat ions that include moisture transport, snow accumulation and melting and soil freezing and thawingare investigated. This model was evaluated against measured data at depths of 0.5 and 1.0 m for twolocations in the northern United States of America. The results show that the model is capable of providinggood simulat ions of the evolution of temperature all over the year. Comparisons of simulat ion results withfive combinat ions of modeled phenomena to experimental data demonstrate that both snow cover andfreezing and thawing of soil are of important when modeling temperature for soil. However, temperaturewas not substantially affected by the moisture transport.