shypFun.01110 {spsh}

van Genuchten-Mualem Soil Hydraulic Proptery Model

Description

van Genuchten-Mualem functions for the retention and hydraulic conductivity curves (van Genuchten 1980).

Usage

shypFun.01110(p, h)

Arguments

p

vector of the 6 van Genuchten-Mualem model parameters, the 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 [-]
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 solves analytically the spec. water capacity function and integral to the capillary bundle model. It can be extended by the Brunswick model to account for non-capillary storage and conductivity (Weber et al. 2019).

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

van Genuchten MT (1980). “Closed-form equation for predicting the hydraulic conductivity of unsaturated soils.” Soil Science Society of America Journal, 44(5), 892–898. ISSN 03615995 (ISSN). Weber TK, Durner W, Streck T, Diamantopoulos E (2019). “A modular framework for modelling unsaturated soil hydraulic properties over the full moisture range.” Water Resources Research. ISSN 0043-1397, doi: 10.1029/2018WR024584.

Examples

p      <- c(0.1, 0.4, 0.01, 2, 100, .5)
h      <- 10^seq(-2, 6.8, length = 197)
shyp.L <- shypFun.01110(p, h)