Abstract
AbstractSoil thermal conductivity (λ) depends largely on the volume fractions of soil solids, air and water. Previous studies focus mainly on developing saturation or soil water content (θ) dependent λ models. There are reports that λ is correlated more with air‐filled porosity (na) than with θ, and the correlation is less affected by solid fraction and λ of soil solids. In this study, a simple linear relationship between λ and na is developed with both newly measured and published datasets. Independent evaluations showed good agreement between estimated and measured λ values with root mean square errors less than 0.24 W m−1 K−1, indicating that the linear λ‐na relationship could be used to approximate λ from na with satisfactory accuracy.
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