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.


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