soilwater3 | R Documentation |
Function to calculate the soil water content based on the Dexter's (2008) formula. It is based on the segregation of pore space in two categories what are called bi-modal pore size distributions. In this model, the pore space is divided into two parts: the textural porosity which occurs between the primary mineral particles, and the structural porosity which occurs between micro aggregates and/or any other compound particles. This is called the double-exponential (DE) water retention equation, given by:
θ = θ_R + a_1 \exp(-x/p_1) + a_2 \exp(-x/p_2)
where θ is the gravimetric water content.
soilwater3(x, theta_R, a1, p1, a2, p2)
x |
a numeric vector containing the values of applied air pressure. |
theta_R |
a parameter that represents the residual water content. |
a1 |
a parameter that represents the drainable part of the textural pore space in units of gravimetric water content at saturation. |
p1 |
a parameter that represents the applied air pressures characteristic for displacement of water from the textural pore space. |
a2 |
a parameter that represents the total structural pore space in units of gravimetric water content at saturation. |
p2 |
a parameter that represents the applied air pressure that is characteristic for displacing water from the structural pores. |
The the soil water content.
Anderson Rodrigo da Silva <anderson.agro@hotmail.com>
Dexter et al. (2008). A user-friendly water retention function that takes account of the textural and structural pore spaces in soil. Geoderma, 143:243-253.
fitsoilwater3
, soilwater
, soilwater2
soilwater3(x = 0, theta_R = 0.058, a1 = 0.233, p1 = 3.274, a2 = 0.070, p2 = 1.78) soilwater3(x = 3, theta_R = 0.058, a1 = 0.233, p1 = 3.274, a2 = 0.070, p2 = 1.78) soilwater3(x = 4, theta_R = 0.058, a1 = 0.233, p1 = 3.274, a2 = 0.070, p2 = 1.78) # End (not run)
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.