shypFun.03110 {spsh}

Unimodal Fredlund-Xing - Mualem Model

Description

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

Usage

shypFun.03110(p, h)

Arguments

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.

Details

The function numerically solves the spec. water capacity function and integral to Mualem's conductivity model.

Value

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

Author(s)

Tobias KD Weber , [e-mail]

References

Fredlund DG, Xing A (1994). “Equations for the soil-water characteristic curve.” Canadian Geotechnical Journal, 31(4), 521–532. ISSN 00083674 (ISSN), doi: 10.1139/t94-061.

Examples

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)