shypFun.01310: van Genuchten-Mualem trimodal Soil Hydraulic Propterty Model
In spsh: Estimation and Prediction of Parameters of Various Soil Hydraulic Property Models

Description Usage Arguments Details Value Author(s) References See Also Examples

trimodal van Genuchten-Mualem functions for the retention and hydraulic conductivity curves \insertCiteDurner.1994spsh.

1	shypFun.01310(p, h)

p

vector of the 9 van Genuchten-Mualem model parameters, order is sensitve and has to be given as:

`thr`	residual water water content [cm cm-3]
`ths`	saturated water water content [cm cm-3]
`alf1`	van Genuchten alpha [cm-3]
`n1`	van Genuchten n [-]
`w1`	fraction of the first modality [-], `w2` is internally computed as `w2 = 1-w1`
`alf2`	van Genuchten alpha of the second modality[cm-3]
`n2`	van Genuchten n of the second modality [-]
`w2`	fraction of the second modality [-], `w3` is internally computed as `w3 = 1-w1-w2`, in `resFun` ensures `w3 >=0`
`alf3`	van Genuchten alpha of the third modality[cm-3]
`n3`	van Genuchten n of the third modality [-]
`Ks`	saturated conductivity [cm d-1]
`tau`	exponent of `Se` in the capillary conductivity model, sometimes denoted in the literature as `l` [-]

h

pressure heads [cm] for which the corresponding retention and conductivity values are calculated.

The function solves analytically the spec. water capacity function and integral to the capillary bundle model.

returns a list with calculations at specified h:

`theta`	calculated volumetric moisture content
`Se`	calculated saturation
`cap`	specific water capacity function
`psd`	pore size distribution
`Kh`	Hydraulic conductivity values

Tobias KD Weber , tobias.weber@uni-hohenheim.de

\insertRef

Durner.1994spsh

\insertRef

Weber.2019spsh
\insertRefWeber.2017aspsh
\insertRefWeber.2017bspsh

p <- c("thr" = 0.1, "ths" = 0.4, alf1 = .5, "n1" = 3,
       "w1" = .5, "alf2" = 0.01, "n2" = 2, 
       "w2" = .3, "alf3" = 0.01, "n3" = 1.6, 
       "Ks" = 100, "tau" = .5)
h <- 10^seq(-2, 6.8, length = 197)
shyp.L <- shypFun.01310(p, h)