ptf.vG2BW: Parameter Transfer Function for Weber et al.(2019) model.

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

Description

Predicts \insertCiteWeber.2019spsh model parameters in the van Genuchten-Mualem variant 01110FM, from given van Genuchten-Mualem parameters for the constrained van Genuchten-Mualem model.

Usage

ptf.vG2BW(x)

Arguments

x	vector of 6 van Genuchten-Model parameters. The order is sensitive see for shypFun.01110 thr Residual water content (-), alway equal to zero ths Saturated water content (-) alf1 Shape parameter (cm^-1) n1 Shape parameter (-) Ks Hydraulic conductivity at 0 potential (cm/day) tau Shape parameter (-)

Details

Pedotransfer function returns the van Genuchten - Mualem model shypFun.01110 parameters in the Brunswick-Model variant 01110FM, based on previously determined van Genuchten-Mualem parameters. The transfer function is based on an ordinary linear regression between the i-th 01110 and 01110FM. The paraemeters were based on model parameter estimation to a dataset of >400 samples with retention and conductivity measurements.

Value

thsnc	Saturated water content of the non-capillary part.
thsc	Saturated water content of the capillary part.
alf	Shape parameter (cm^-1)
n	Shape parameter (-)
Ksc	Saturated hydraulic conductivity of the capillary part [cm day-1]
tau	Shape parameter (-)
Ksnc	Saturated hydraulic conductivity of the non-capillary part [cm day-1]
a	slope of the non-capillary unsaturated conductivity [ - ]
h0	anker point at which the water content is 0

Note

The parameter transfer function was derived by weighted linear regression with weights in x and y, by regressing the estimated the Brunswick model parameters in the Genuchten Mualem variant \insertCiteWeber.2019spsh inferred from matching measured soil water retention and hydraulic conductivity data against the constrained van Genuchten model parameters. The regression of alf1 and Ks, and (n-1) was done in the log[10])-transformed space, and Kncs is a fixed value of 10^-1.72.

Author(s)

Efstathios Diamantopoulos , [e-mail]

Tobias KD Weber , [e-mail]

See Also

shypFun

Examples

p      <- c(0.08, 0.42, 0.01, 1.5, 100, 0.5)
result <- ptf.vG2BW(p)

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