Impose characteristics for different hydro-geological layers in a model layer.

Dear friends,

I'm now having a 3 layer model (as unconfined, aquitard, confined aquifer at first). These layers are determined by elevation point data. When I import elevation data for 4 slices (with kriging as the interpolation method), there are intersection and I just adapt with default value (the distance is 0.1 m). I understand that where the distance between 2 slices is 0.1 m the upper hydro-geological layer is absent and I need to impose the characteristics of lower hydro-geological layer on these areas. It means that there are 2 'groups' of values in the same model layer.

But I don't know how to determine or to zone these areas in order to impose different characteristics (K, recharge,...).

Could you please help me?
Thanks a lot!
Thuy.

There are different options for this. Many of our users work with GIS systems. In this case, the layer thickness can be exported from FEFLOW to a shape file, based on which zonation can be done in GIS. The same procedure would be possible with a CAD system. When working with FEFLOW alone, I'd also export the layer thickness, load it as a background map and manually apply properties of the underlying layer in zones with minimum layer thickness.

Dear Mr. Schatzl,

Thank you very much for your reply.

I still have a problem.
When I export the thickness into file .shp:
In menu Slice Elevation:  Special/z_coordinates/Thickness (option for operating)/Mesh (Save as plot file..).
I open this shp file in MapInfo and I cannot find the thickness in browser, just see Id (all of them are 1) and another attributed property called Elno (with continuous value from 1 to 30,556).
I also add this shp file as map in Feflow and use Mesh Inspector to see, and find just the elevation.

I don't know at which step I was wrong.

 

Additionally, when I export the thickness as trp flie (save nodal quantities as points) I can see more data which I guess are the calculated thickness :)

However I find here many extremely small value (10.e-10). When I interpolate the slice elevation I have chosen minimum top and bottom distances are 0.1m.

I don't understand why there appear such small thickness values?!

I'm waiting for any ideas.
Thuy.

The 'Mesh' export only exports the mesh, without any information about properties. You should use - as you have done - a nodal export or an export of 'Isolines' to obtain the values in the output.
When you apply a minimum thickness during interpolation, this is only used at nodes where actually an intersection of slices would otherwise happen. If there is still a positive layer thickness - no matter how small it is - the minimum thickness is not applied. To avoid/correct these small thicknesses, you should use 'Modifiy slice distance' in the Slice Elevations menu.

Hallo,

With trp exported files I can have the thickness in points.
When I use Isoline/Finger I can see data in areas. In attributed data I have ID, Elev_l and Elev_h. I combine objects using ID to have less groups. I guess the thickness is equal to (Elev_h - Elev_l); however I realize that all the thickness here are the same (about 2 m).

I don't really understand the way they are calculated and how I can change some default values to get my target.

Thank you Mr. Schatzl for helping me step by step. I do hope to hear from you more!
Thuy.