soilhypfit_sim_wrc_hcc: Simulated Soil Water Retention and Hydraulic Conductivity...

In soilhypfit: Modelling of Soil Water Retention and Hydraulic Conductivity Data

Simulated Soil Water Retention and Hydraulic Conductivity Data

Description

The data give simulated values of water content and hydraulic conductivity at given capillary pressure head for 3 soil samples.

Usage

data(sim_wrc_hcc)

Format

A data frame with 28 observations on the following 4 variables.

id

a factor with levels 1, 2, 3 coding the soil samples.

head

a numeric vector with values of capillary pressure head (unit \mathrm{m}).

wc

a numeric vector with values of simulated volumetric water content (unit -)

hc

a numeric vector with values of simulated hydraulic conductivity (unit \mathrm{m} \, \mathrm{d}^{-1}).

Details

The values of wc and hc were simulated by the model of Van Genuchten Mualem (Van Genuchten, 1980, see wc_model and hc_model) with the following parameters:

sample id	\theta_r	\theta_s	K_0 [\mathrm{m} \, \mathrm{d}^{-1})]	\alpha [\mathrm{m}^{-1}]	n	\tau
1	0.05	0.45	0.1	2	2	0.5
2	0.1	0.5	5	1.5	1.5	0.5
3	0.05	0.45	2	1.4	1.3	0.5

Normally distributed errors were added to the model values (wc: sd: 0.05; log(hc): sd 0.5).

References

Van Genuchten, M. Th. (1980) A closed-form equation for predicting the hydraulic conductivity of unsaturated soils. Soil Science Society of America Journal, 44, 892–898, \Sexpr[results=rd]{tools:::Rd_expr_doi("10.2136/sssaj1980.03615995004400050002x")}.

Examples

data(sim_wrc_hcc)

if(!requireNamespace("lattice", quietly = TRUE)){
  install.packages("lattice", repos = "https://cloud.r-project.org/")
  requireNamespace("lattice", quietly = TRUE)
}

lattice::xyplot(wc ~ head|id, type = "l", sim_wrc_hcc, 
  scales = list( x = list(log=TRUE)))
lattice::xyplot(hc ~ head|id, type = "l", sim_wrc_hcc, 
  scales = list( log = TRUE))

soilhypfit documentation built on Aug. 8, 2025, 7:01 p.m.