soilwater2 {soilphysics} | R Documentation |
Soil Water Retention, based on the Groenevelt & Grant (2004) formula
Description
Function to calculate the soil water content based on the Groenevelt & Grant (2004) model. It is based on thermodynamic principles. Therefore, it is appropriate for the case in which thermodynamic equilibrium has been attained by diffusion of water. In this case, the water retention curve is given by:
\theta = k_1 \exp(-k_0 / x_0^n) - k_1 \exp(-k_0 / x^n)
where x = log h
(pore water suction), and h is in units of hPa
Usage
soilwater2(x, x0 = 6.653, k0, k1, n)
Arguments
x |
a numeric vector containing pF values. |
x0 |
the value of pF (pore water suction) at which the soil water content becomes zero. The default is 6.653. |
k0 |
a parameter value. |
k1 |
a parameter value. |
n |
a parameter value. |
Value
The the soil water content.
Author(s)
Anderson Rodrigo da Silva <anderson.agro@hotmail.com>
References
Groenevelt & Grant (2004). A newmodel for the soil-water retention curve that solves the problem of residualwater contents. European Journal of Soil Science, 55:479-485.
See Also
Examples
pF <- 0:7
soilwater2(pF, k0 = 1.867, k1 = 0.426, n = 2.358)
# End (not run)