Saturation dependent thermal conductivity model for soil.
The arithmetic_squareroot model is proposed by Somerton, W.~H. et al. [38], which takes the form of
\lambda = \lambda_{\text{dry}} + \sqrt{S}(\lambda_{\text{wet}}- \lambda_{\text{dry}}),
. The arithmetic_linear model is linear in the saturation and has the form
\lambda = \lambda_{\text{dry}} + S(\lambda_{\text{wet}}-\lambda_{\text{dry}}),
The geometric model uses the weighted geometric mean
\lambda = \lambda_{\text{dry}}^{1-S} * \lambda_{\text{wet}}^S,
where \lambda_{\text{dry}} is the thermal conductivity of soil at the dry state, \lambda_{\text{wet}} is the thermal conductivity of soil at the fully water saturated state, and S is the water saturation.
No additional info.