shypFun.03110: Unimodal Fredlund-Xing - Mualem Model
In spsh: Estimation and Prediction of Parameters of Various Soil Hydraulic Property Models

Description Usage Arguments Details Value Author(s) References Examples

Calculates the soil hydraulic property function values based on given pressure heads. The function calculates the base function of Fredlund and Xing \insertCiteFredlund.1994spsh.

1	shypFun.03110(p, h)

p

vector of the 6 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`	inverse of the air entry pressure head [cm]
`n1`	width of pore size distribution [ - ]
`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 numerically solves the spec. water capacity function and integral to Mualem's conductivity 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

Fredlund.1994spsh

1
2
3

p      <- c(0.1, 0.4, 0.01, 2, 100, .5)
h      <- 10^seq(-2, 6.8, length = 197)
shyp.L <- shypFun.03110(p, h)

Loading required package: DEoptim
Loading required package: parallel

DEoptim package
Differential Evolution algorithm in R
Authors: D. Ardia, K. Mullen, B. Peterson and J. Ulrich

Loading required package: lhs
Loading required package: pracma
Loading required package: FME
Loading required package: deSolve

Attaching package: ‘deSolve’

The following object is masked from ‘package:pracma’:

    rk4

Loading required package: rootSolve

Attaching package: ‘rootSolve’

The following objects are masked from ‘package:pracma’:

    gradient, hessian

Loading required package: coda

Attaching package: ‘FME’

The following object is masked from ‘package:pracma’:

    Norm

Loading required package: hypergeo