Hironori DOI

Development of a Physically Based Model for Soil Water and Heat Transfer Processes in Arid Cold Region

Minjiao LU

In North Asia, rapid desertification is occurring. It is expected that the water cycle is fully understood. So, soil water and heat transfer model is needed. In this region, however, permafrost and seasonal frozen soil widely exist. Freezing and melting processes of soil moisture in frozen soil region affect greatly to soil water and heat transfer processes. The objective of this study is the development of a physically based model for soil water and heat transfer processes in arid and cold region.
This model has three characteristics. The first characteristic is that phase change process is included in order to considered freezing and melting of soil water. The second characteristic is that the number of layers can be arranged arbitrarily. The third characteristic is that parameters for heat conductivity are decided by Force-Restore-Method. The output from this model is compared with observation. As a result adaptability of this model is proved.