Estimation of van Genuchten parameters

Hello,

i would like to use FePest to estimate hydraulic conductivity and van Genuchten parameters. Unfortunately, the parameter list in the the FePest interface does not offer alpha or n. Only a parameter called "Unsaturated-flow model type". Since this is a category in the Feflow setup and not a single parameter i am wondering if i have an mistake in the setup.
Is it possible to choose alpha and n in the FePest interface for estimation?

Thanks for helping

Ludwig

Hi Ludwig,

Unfortunately at the moment, FePEST graphical interface does not support unsaturated parameters as a Parameter Definition for calibration.
However, you can still calibrate these variables including a so-called IFM-implemented parameter definition. You will need to write an IFM plug-in to retrieve and set unsaturated parameters, basically you will use the following functions:

IfmGetMatUnsatAirEntryPressureHead
IfmGetMatUnsatFittingCoefficient
and their corresponding IfmSet... functions.

Cheers,

Carlos