GEOB 300 - Modelled soil temperatures for a homogeneous soil.

This web-applet illustrates the analytical solution for the heat flux equation we discussed in Lecture 13. We assume a homogeneous soil and apply a sinusoidal daily course of the surface temperature (first graph, red curve).

Select a model run:
The parameters for the runs can be found at the end of this page.

Display diurnal temperture curve at depth:



Display profile at time:



The following table summarizes the settings for the above model runs:

Run Saturated Mineral Soil Saturated Peat Soil
Porosity 0.55 0.85
Soil volumentric water content &thetaw 0.45 0.15
Heat capacity of soil C 3.2 MJ m-3 K-1 3.9 MJ m-3 K-1
Thermal conductivity of soil k 1.7 W m-1 K-1 0.5 W m-1 K-1
Thermal diffusivity of soil µ 5.0 x 10-7 m2 s-1 1.2 x 10-7 m2 s-1
Amplitude of surface temperature wave ΔT0 10 K
Daily average surface temperature T0 15°C
Wave period P 86400 s (=1 day)
Wave lag tl 26400 s

University of British Columbia - GEOB 300 - Designed and programmed by: Supported by a TLEF grant 'climate@ubc'.

The full source code in form of an interactive LabView VI can be downloaded from