Abstract
The thermal properties, heat conductivity λ and volumetric heat capacity C or thermal diffusivity a = λ/ C, have been determined for soils in the field using a newly developed method. In this method a heat-flux meter is placed on the surface and a “heat pulse” is given by irradiating the heat-flux plate by an incandescant lamp for a short period 5–31 min. Instead of irradiating, shading of the soil can be applied on bright days. The use of Laplace transforms for temperature records permits calculation of the thermal properties in cases of a non-periodic, arbitrary temperature variation. The method has been developed particularly for application to the soil close to the surface, but it can be used for the determination of λ/ C in deeper layers also. Examples for a clay, sandy and peat soil are given.
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