Denim Umeshkumar Anajwala

Good luck with getting [i][b]exact [/b] [/i] flux values out of a FE model .... I'd say that's close to impossible. Try to use the estimates that the Fluid Flux Analyzer gives you. That's likely as good as it gets - unfortunately  :(

Cheers, Chris

The easiest is to export the elevations of slice one (or any nodal data for what it matters) as a shape file and import it to your GIS software. That will give you the exact coordinates (make sure you work in global coordinates!!). I don't think the GUI provides a coordinate inspector :-(

As for excellent and inexpensive GIS software I recommend to take a look at Manifold. It starts at just $245!!! You can find more information at [url=http://www.manifold.net/info/products.shtml]http://www.manifold.net/info/products.shtml[/url]

Cheers, Chris

Hey Chrisoula,

as Eladd already pointed out, in version 5.2 it's a little more complicated.

The traditional way is to define observation points for your model slices (see "Info - Help - Glossary - R - Reference Distributions - Reference Data - Observation single points" for details). FeFlow will write the simulated heads for those observation points to the DAR file. The DAR file is a simple text file and you can find those exported heads at the end of the file. Copy-and-Pasting them to Excel is one option to compare them to your observed values.

All this can be automated using IFM modules, but that requires programming skills. All you need then is an input file with your observation point locations. The IFM module would read that file and write the data plus simulated heads to an output file.

At the FeFlow User Conference in Berlin last year, I gave a presentation about this and attach the paper that came with it for your information.

Good luck, Chris

i wonder what the 'weight' means at
PEST --> observations  --> observations editor.
does it some kind of uncertainty?
i.e. i need to enter weight=1 if i'm 100% sure and weight=.95 if i'm only 95% sure?
for example if i assume head is 25-+1 that means 100%-(1/25)=96% certainty???

i appriciate any answer!
good day,
Elad

This option is only at ver 5.3.
on previous version this is more complicated and involved export to excell

Elad

Hey Chrisoula,

there is a demo video available on WASY's web page:

How to use scatter plots for steady-state calibration?
[url=http://www.wasy.de/english/produkte/feflow/howto/video_calib.htm]http://www.wasy.de/english/produkte/feflow/howto/video_calib.htm[/url]

Check it out  ;)

Also, read "Observation single points" under "Info - Help - Glossary - R - Reference Distributions - Reference Data - Observation single points". It explains how to specify observation points in your model, and references the DAR file format where the output is stored.

Good luck, Chris

to find an element you can go to the mesh generator menu and browse the mesh with the enlarge button.

otherwise, export is to *.shp file and browse it with GIS program.

to define exact element type u can use the built-in option in the generator menu and decide number of elements. for example if you have a 1200m line and you wish a 40m element type 30 (i.e. 1200m divide to 30 elements give 40m to each element).

Elad :)

If I understand the question, you have a model initially set up to simulate from time = 0 to time = 10 (for example). However, you stop it at time = 6 to take a look at results. Now, you wish to restart it so that the simulation may continue to time = 10.

Situation 1. You have only "paused" the simulation. Analysis can proceed for the current time step only. Click on "(Re-) run simulator " to restart the simulation from where you left off. The dac file will be appended.

Situation 2. You have stopped the simulation and either (A) selected Exit to Master Menu ... Postprocessor ... and opened the dac file, or (B) closed FEFLOW ... restarted FEFLOW ... Postprocessor ... and opend the dac file. Opening the dac file in the postprocessor allows you to analyze any time step completed by the model. In this case, if you wish to continue the simulation, click on "Continue Simulation". The program opens a new menu from which you can change output options, solver options, and start the simulation. The new simulation results will be appended onto the existing dac file (indeed, it appears that this cannot be changed, if the initial simulation wrote to a particular dac file, so must the continuation).

I have run into situation 2 frequently. For example, if the power goes off during a simulation. To recover, I just open the dac file, and click on "continue simulation". A very nice feature not found in the MODFLOW GUIs! Be carefull however. Stopping and restarting in this way actually writes model results for the last time step completed. This time step will probably not be a time step for which you have specified to save model results (if desired under "Saving time levels at fixed stages as edited").

Situation 3. Your model has finished to t = 10. Upon opening the dac file, you still have the option of continuing the simulation only you must specify a new final time (default appears to by a final time equal to the original file time plus the original model duration, i.e. t = 20 in my example). The results will be appended to the existing dac file (again, it cannot be changed).

I am not clear on what you mean "running it as a batch file" and this may have some bearing on my answers. However, I agree with Chris--Why would you need to merge them (outside of the FEFLOW environment). Strictly speaking, the dac file can be saved as a text-file, and through some careful editing, one could merge two dac files together, but it seems to me that there is an element of fraud involved. The merged dac file may not truely represent a valid simulation.

Interesting question! I'm not aware of such an option. Why would you need to merge them though?

Chris

I have a whole collection of those small, simple models. I use them mostly for debugging IFM modules, but they help a lot understanding how parameters work as well.

Good luck with your particle tracking,

Chris