sim_wrc_hcc {soilhypfit} | R Documentation |
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
).
wc
a numeric vector with values of simulated volumetric water content (unit -)
hc
a numeric vector with values of simulated hydraulic conductivity (unit
).
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 | | | [ )]
| [ ] | | |
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))