FePEST: Calibrate a model using spring hydrograph

Hi there, I have a problem. I should calibrate a model in PEST relative to a mountain area where I don't have piezometric data available.

I have data relative to the hydrograph spring of the only spring present.

I would to know if is possible introduce a hydrograph spring in PEST (trough a transient simulation) and in positive case how I can make it.

Thanks in advanced

Karanka

Hi Karanka,

First in FEFLOW, you would need to activate the budget history charting mode in a selection with the spring nodes. Then FePEST can recognize the budget activation and provide the option of creating an "Observation Definition" based on a rate-budget value. At the moment FePEST only supports the budget at the end of the model run or the difference (final - initial). As a first estimate, you may use this option.
You can implement a complete budget calibration via IFM programming. If you have a plug-in, which is able to retrieve the budget fluxes at specific time steps and write them down in a file named ifm.fpo (two-columns format: Obs. Name, Value), then FePEST can read this information and use it for the model calibration. In FePEST, you would need to setup a so-called [color=blue][i][b]IFM-Implemented Observation Definition[/b][/i][/color] with the same number of observations and names.

Regards,
Carlos

Hi Carlos thank you very much for your useful response!

I will try the second option that you say or the implementation of a complete budget calibration via IFM. In this case
I need a plugin of this type! I wanted to know if you knew of its existence.

Thanks again

Karanka

Dear Karanka,
Unfortunately, such as plug-in does not exist. If you have some experience with programming in C++, the plug-in would not be a big deal...
Regards,
Carlos

Hi Karanka,

I would like to re-open this forum post. [u][i][b]Correction[/b][/i][/u]: Since FEFLOW 6.2 (p8), you have access to the full budget (rate or period). In FePEST we have shortly implemented a new feature, where you can provide a time series (*.pow file) to be used directly for the model calibration.

Regards,
Carlos

Hi Carlos thanks for the information!!! I just saw the post.

I would to know if there is a manual/report related to this new updating or other informations for understand this new tool.

Thanks again,

Karanka

Hi Carlos, I have the FeFLOW 6.2 version (p8) but I can not find these new feature! where is it? What is the name of the plug-in?

Thanks again

Karanka

Hi Karanka,

This feature is not a plug-in. You will find it directly in the Parameter Estimation software (FePEST interface). If you attach a FEFLOW FEM file to FePEST, where the option "Budget Charting Mode" is active for a a nodal selection, you would be able to create an observation definition for the calibration based on the Rate/Period budget information. Here also you can import a POW file with the times and budget information.

Regards,
Carlos