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Petra Furychova

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  1. Computational time of the transient model

    Hi Bruce, thank you for sharing these settings. I have done one test on one of my models that is in NWT (around 2 million cells). Well, the model converged to me but I didn't get any significant improvement of the model runtime. Maybe the main benefit of those settings is for the model with even bigger size (as you had mention that your model consists of 8 mil cells) In any case thanks, once it can be certainly useful.
  2. Computational time of the transient model

    Hello Bruce, Thank you for your advice. I expected a bit that the reply would be better PC , but I was interested if someone has any tricks or advices. At the end I decreased the cellsize of the grid (to one third – around 800 000), and got to the running time around an hour. In this way I am losing the high resolution which was necessary for my project, but at least I am able to work on calibration of model in some reasonable model-running time. I would be really interested in your NWT solver set-up as I am dealing many times with the models with the size in this order of magnitude. Are your settings specific to your model or it can be applied to any model?
  3. Computational time of the transient model

    Hi everyone, I would like to ask about the length of the computational time of the transient model. I have built already several more complex models, but my transient models never exceeded 1 or max 2 hours to be finished. Not this time. I had built (I have to admit rather big model) with the number of the cells around 3 000 000. As flow package there is used HUF and as the solver PCG2. For the steady state my model finishes somewhere at the 10th iteration with the total computational time around 7 min. Built on that is the transient model with 27 stress periods. From previous experience I would guess the maximum time around 1.5 hour – stress periods usually are getting faster to be run. What surprised me is that I am getting to the time more than 4 hours. Changing convergence criteria doesn’t help me, as the problem is not the convergence of the model itself – at least for outer iterations (for each stress period I have convergence within 3 – 5 iterations). Neither changes of the solver had helped me. In my model occurs several bigger places with dry cells – but I am not allowing rewetting – could it be the problem? I had built similar model in with NWT solver – there was the time around 1.5 hour to complete transient model. Is there any reason why HUF should cause longer computation? Thanks for any kind of the tips or ideas to get this model faster ;-)
  4. Cell Discretization

    Maybe you could use Local grid refinement? to define new child grid (inside the original parent grid) with refined cellsize?
  5. Problem with importing of rasters

    Thank you , the problem was indeed in the Projection, it was kept in the feets. Now is solved.
  6. Hello, I am struggling with exporting the river coverage to shapefile - mainly I want to export the nodes with its ID and the head stages to shapefile I do it in standard way: Export Coverage - and choosing the .shp extension. Then I can export arcs and point file (polygon no as my coverage doesnt contain any polygons). The shp with arcs is exported without any problem, but what I am mainly interested is the shapefile with points. That is created but it doesn' t contain any data. (it contains just the names of attributes, but under that novalue). Is there any problem? According to gms wiki, should be possible to export head stages of rivers. My aim is to export GMS ID of nodes of the coverage (to have the information of X, Y coordinate and GMS ID), so I thought exporting to shapefile would be the easiest way. Is there any other possibility how to export ID of the Nodes with its XY coordinates from coverage to some format that can be then easilly processed (e.g excel,?) Thank you for any advice (I am using GMS 10.1.05) Petra
  7. Interpolate raster to modflow layers not working

    Do your rasters have the good elevation when you import it to GMS? Actually to me gms perform the same problem. I have posted it here just few hours before you. The problem just occurs step before the interpolation, when I import it to the GMS, it already has some crazy values. And indeed that different values then are taken to interpolated layer.
  8. Problem with importing of rasters

    I have problem with importing the raster (both in format ascii and also tiff). When I am importing those rasters to the empty GMS file, then I see the right z value of topography. But afterwards when I try to insert the same rasters to my model (already with grid and some coverages) - imported rasters have completely another Z value (change from 50 m to 200 m). Does anyone know what is the reason of this issue? I am using licence of GMS 10.1.5 ( I have found that this problem was probably solved by the bug for licence 10.0.6 - so why then it occurs also in my licence?) Thanks for any advice