shypFun.01210: van Genuchten-Mualem bimodal Soil Hydraulic Propterty Model

In spsh: Estimation and Prediction of Parameters of Various Soil Hydraulic Property Models

Description

bimodal van Genuchten-Mualem functions (Durner model) for the retention and hydraulic conductivity curves \insertCiteDurner.1994spsh.

Usage

shypFun.01210(p, h)

Arguments

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 [-] 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.

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

\insertRef

Durner.1994spsh

Examples

p <- c("thr" = 0.1, "ths" = 0.4, alf1 = 0.5, "n1" = 3,
       "w1" = .6, "alf2" = 0.01, "n2" = 1.6, 
       "Ks" = 100, "tau" = .5)
h <- 10^seq(-2, 6.8, length = 197)
shyp.L <- shypFun.01210(p, h)

spsh documentation built on April 14, 2020, 6:37 p.m.