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).
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 &theta_{w} | 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} m^{2} s^{-1} | 1.2 x 10^{-7} m^{2} s^{-1} |
Amplitude of surface temperature wave ΔT_{0} | 10 K | |
Daily average surface temperature T_{0} | 15°C | |
Wave period P | 86400 s (=1 day) | |
Wave lag t_{l} | 26400 s |
University of British Columbia - GEOB 300 - Designed and programmed by: andreas.christen@ubc.ca. Supported by a TLEF grant 'climate@ubc'.
The full source code in form of an interactive LabView VI can be downloaded from https://github.com/achristen/Soil-Temperatures