soil_thermodynamics {medfate} | R Documentation |
Soil thermodynamic functions
Description
Functions soil_thermalConductivity
and soil_thermalCapacity
calculate thermal conductivity and thermal capacity
for each soil layer, given its texture and water content. Functions soil_temperatureGradient
and soil_temperatureChange
are used to calculate soil temperature gradients (in ºC/m) and temporal temperature change (in ºC/s)
given soil layer texture and water content (and possibly including heat flux from above).
Usage
soil_thermalCapacity(soil, model = "SX")
soil_thermalConductivity(soil, model = "SX")
soil_temperatureGradient(dVec, Temp)
soil_temperatureChange(dVec, Temp, sand, clay, W, Theta_FC, Gdown)
Arguments
soil |
Soil object (returned by function |
model |
Either 'SX' or 'VG' for Saxton's or Van Genuchten's pedotransfer models. |
dVec |
Width of soil layers (in mm). |
Temp |
Temperature (in ºC) for each soil layer. |
sand |
Percentage of sand (in percent weight) for each layer. |
clay |
Percentage of clay (in percent weight) for each layer. |
W |
Soil moisture (in percent of field capacity) for each layer. |
Theta_FC |
Relative water content (in percent volume) at field capacity for each layer. |
Gdown |
Downward heat flux from canopy to soil (in W·m-2). |
Value
Function soil_thermalConductivity
returns a vector with values of thermal conductivity (W/m/ºK) for each soil layer.
Function soil_thermalCapacity
returns a vector with values of heat storage capacity (J/m3/ºK) for each soil layer.
Function soil_temperatureGradient
returns a vector with values of temperature gradient between consecutive soil layers.
Function soil_temperatureChange
returns a vector with values of instantaneous temperature change (ºC/s) for each soil layer.
Author(s)
Miquel De Cáceres Ainsa, CREAF
References
Cox, P.M., Betts, R.A., Bunton, C.B., Essery, R.L.H., Rowntree, P.R., and Smith, J. 1999. The impact of new land surface physics on the GCM simulation of climate and climate sensitivity. Climate Dynamics 15: 183–203.
Dharssi, I., Vidale, P.L., Verhoef, A., MacPherson, B., Jones, C., and Best, M. 2009. New soil physical properties implemented in the Unified Model at PS18. 9–12.
See Also
Examples
examplesoil = soil(defaultSoilParams())
soil_thermalConductivity(examplesoil)
soil_thermalCapacity(examplesoil)
#Values change when altering water content (drier layers have lower conductivity and capacity)
examplesoil$W = c(0.1, 0.4, 0.7, 1.0)
soil_thermalConductivity(examplesoil)
soil_thermalCapacity(examplesoil)