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About Michal

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  1. Michal

    Changes to MODFLOW-USG?

    It may be a long shot as I dont have much details about the model itself, but there might have been some changes in the default values for the solver between MF versions.
  2. Michal

    Importing XYZ data and attribute (pressure)

    If I understand it right, you have raster dataset of measured heads and you basicaly want your model to reproduce these as close as possible. Why not just convert the raster data to points a treat each point as observation point? Then you can formulate the inversion problem as usual.
  3. Michal

    How to import/read a binary *.hds file?

    Hello, what kind of errors are there during the check? If you were able to load the simulation into gms, you should also be able to read the solution. Try right clicking on the simulation (MODFLOW in the project tree) and select Read Solution command. Then just select the modflow name file and the binary data should load.
  4. Michal


    You are welcome, I am happy it worked
  5. Michal


    Hi Kanchana, its realy hard to tell what may be causing the troubles. I guess it will be something in the reaction module related to the reaction rate. Try to run the simulation for lets say a minute with time steps in the order of seconds or fractions of a second. Also increasing grid resolution may improve the solution.
  6. Michal


    I guess it can. For instance if the reaction module causes abrupt changes in concentration of some specie. Does it run ok with MT3DMS? I mean without the reactions only as conservative transport?
  7. Michal


    Hi Kanchana, on the stress period dialog, try to increase the Max. trans. steps variable. It is the maximum number of transport steps allowed during each time step of a flow solution. Give it a high value like 1e6 and see what happens. While performing transport simulation with MT3D based model, time steps are further divided into transport steps. When you leave 0.0 as transport step size, the model calculates transport steps size itself according to certain criteria based on the flow solution. These stability criteria relates among others to the Courant number, you can find more about these in the MT3DMS manual (Zheng, Wang, 1999).
  8. Hi, I would like to see a functionality in GMS, that would make working with pumping data more easy. Let me make an example to explain what I mean. Consider we would like to import pumping schedule for a single well into a transient model with three periods with a length of 30 days each. The well Q for first period was -100, for second the well was off and for third it was -200. The pumping schedule extracted from a database has this format: well_name time Q well1 1 -100 well1 61 -200 I would like GMS to ask me during import, how do I want to treat the stress periods without any pumping data, in this case the second period. I would like to have an option to choose, that when there are no data for a given period GMS would add 0 for that period automaticaly, e. g. the well is off for that period. This would be realy useful, because otherwise one easily forgets to add the zeroes manualy and ends up with incorrect schedule.
  9. Michal

    SFR2 not working with MODFLOW 2005

    Hi Niklas, I have encountered similar problem with MODFLOW-NWT. After an update MF-NWT started to report head below cell bottom error and a model that run ok with previous version was terminated due to this. I solved it by increasing the head slightly as it was only a very small difference. My point is that MF developers added a check module that was not in the old version and you are probably strugling with something similar. MF2K5 being smarter in finding the errors then MF2K (or the SFR2 module). As the best option of fixing the errors is not feasible, you could try looking into MF2K5 change log and maybe try to use older version of MF2K5 that may not contain the check. Or you could disable the check module in the SFR2 source code and recompile MF2K5 yourself. It is a matter of compiling MF2K5 with ICHKSTRBOT_MODULE located in gwf2sfr7.f modified accordingly. Just be aware that you may get incorrect solution as the check has its purpose.
  10. Michal

    Remove Drains from Exported Transient Observations?

    Hi Carrie, you can uncheck the Enable saving of computed flows for all source/sink objects in the Output control.
  11. Michal

    Problem with Null-space Monte Carlo

    Hi speedy, I have also struggled with krigging setting not saved properly. But this was solved in GMS 10.3.4. I have recently succesfuly solved inverse problem with Aquaveo MODFLOW model using PEST. There was pp kriging set up for several parameters. Although it worked ok for me , I would still prefer GMS to use native PEST tools for pp interpolation and PEST structure files for storing interpolation setting as it would allow us to use native USGS modflow for calibration with pilot points very easily. Anyway, thank you for sharing your experience on the forum. It is always very helpful. Best Michal
  12. Michal

    MT3DMS THKSAT error

    Hi, mt3d is trying to read the saturated thickness array from the flow-transport link file (.hff) on unit 10. I suggest you to check that the .hff file is written correctly by modflow. It must be allowed in the GMS output control dialog.
  13. Michal

    Determing boundary condition

    Hi, I think the flow could be calculated as a difference between the head in the model cell and corresponding head at the boundary. Conductance is the proportionality constant. Therefore Q = C (h1 - h2). If you know the head at the boundary (in the neighboring aquifer) and in the model cell, conductance could be easily calculated from the above formula for each model cell and the flow through the boundary would be as specified for each cell.
  14. Michal

    Transient spatially distributed recharge

    Thank you for sharing the solution. Nice one Have you used some sort of interpolation to obtain modflow compatible dataset from the raster data? Or is the grid and rasters identical in number of rows and columns?
  15. Hi, try preparing the transient dataset so, that for each polygon in GMS coverage, there is a corresponding timeserie with the polygon id assigned at each row of the dataset. It will be a large dataset, but GMS should handle it unless you run out of memory.