Modelling Short-Period Changes of Soil Thermal Parameters from Subsurface Temperature Data

In this study, we consider the heat flow modelling for the time variations of both ground temperature and surface temperature and use first a simple homogeneous semi-infinite half space, then a two-layer model. By data inversion, we recover the time variations of thermal diffusivity for the homogeneous case and the thickness of the first layer for the two-layer model. We have obtained reliable estimates of the near-surface thermal properties based on near surface temperature data and analytic solutions. The parameters show a dependance with soil water content during the year.