sim_wrc_hcc {soilhypfit}

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, doi:10.2136/sssaj1980.03615995004400050002x.

Examples

data(sim_wrc_hcc)

library(lattice)

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