Thermal regime of permafrost active layer has a great significance on revealing hydrological processes and ecological changes in Alpine regions.The equivalent-apparent heat capacity was an important method to study this issue.By introducing a parameter describing the saturation of the active layer,the equivalent-apparent heat capacity method was modified to be capable of unsaturated zone.On the premise of ignoring soil moisture convection and the source(sink) of heat,this paper utilized COMSOL Multiphysics ...