OGS

Saturation dependent thermal conductivity model for soil.
The arithmetic_squareroot model is proposed by Somerton, W.~H. et al. [36], 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
\[ \lambda = \lambda_{\text{dry}}^{1S} * \lambda_{\text{wet}}^S, \]
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.
Used in no endtoend test cases.