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Chaachoua Mohamed

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About Chaachoua Mohamed

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  1. Chaachoua Mohamed

    Flow residual and head change map

    Hello, It will be very useful if GMS display after a modflow run, the flow residual value and the head change for each cell (grid values). The display must concern a given iteration and time step selected by the user (that can be controlled under Modflow / Output control command for example) In many cases, a few cells with great residuals values can affect the entire model. Currently, we can only see maximum values of head residual in the *.lst or *.out file and it isn't enough. It will be more interesting to map these parametres and check them in GMS interface (in post processing) Best regards
  2. Chaachoua Mohamed

    Observation Points

    Hello Bjacoby, At first, verify if you have not digitised by mistake a point outside your model. You can right click on each observation coverage and choose Properties and see Min x: Max x: Min y: Max y: Min z: Max z: and be sure there is not an abnormal point, or export your point in a shapefile and do your checks under a sig. The msg you have got just list all possible reasons for no saving some points and that doesn't mean for example you have defined screen intersects. Best regards
  3. Chaachoua Mohamed

    Flow residual and head change map

    Hello, It will be very useful if GMS display after a modflow run, the flow residual value and the head change value for each cell (grid values). The display must concern a given iteration and time step selected by the user (that can be controlled under Modflow / Output control command for example) In many cases, a few cells with great residuals values can affect the entire model. Currently, we can only see maximum values of head residul in the list file and it isn't enough. It will be more interesting to map these parametres and check them in gms interface (in post processing) Cordially
  4. Chaachoua Mohamed

    Flow/Zone Budget

    Hello Bjacoby, Go to Modflow/Output Control... and be sure that Save cell by cell flow terms to *.ccf file is checked on. Then run your model. Select your intersting cells or the entire model and select MODFLOW | Flow Budget I hope that help you
  5. Neither making specified flow 0 nor making an horizontal barrier are used to specify no-flow boundary condition. Just don't specify anything
  6. Chaachoua Mohamed

    Export to ascii from 3D Grid Data folder

    Hello Mr LEMON and Sorry I didn't see your reply at time, Yes, I want to export the current layer in an ascii format so that i can use it in a GIS tool. Thanks
  7. Chaachoua Mohamed

    Exporting Grid Frame

    Hello, To export the Grid Frame to shape, we can follow this : - In the Project Explorer window unchek all items or folders but the Grid Frame. This last must stay cheked on. - Select the Display | Convert to CAD command - A new folder called CAD is created and shown in the Project Explorer window - In the Project Explorer right-click on the CAD folder and then, from the pop-up menu, select the CAD to --> Feature Objects... command. A CAD to --> Feature Objects dialog is displayed. - Select only the Map_gridframe Layer. For the Coverage Name Enter an appropriate name. Then select the OK button. - A new coverage will be created and shown in the Map Data folder in the Project Explorer. - Export this new coverage to a shape. Good Day
  8. Hello, After modflow simulations, we have to export some data and results in an ascii format so that we can manipulate them under another tool (a GIS tool for example). Currently, we can do that by using the 3D grid -> 2D grid then 3D data set -> to 2D dataset and by right-clicking on the folder, we select from the pop-up menu Export... command. It is heavy as operation. Especially, when we must export a considerable number of data sets. I suggest, we only right-click on 3D Grid Data folder and achieve the export to an ascii 2D. Have a great day Mohamed Chaachoua
  9. Chaachoua Mohamed

    Unstructred grid

    Hello, We are sometimes called to develop large regional models ( up to 20,000 km2). We choose a coarse grid cell (up to 5 km x 5km or 10 km x 10 km). Within these models, there are some particular areas that require a set of finer grid cells and others particular areas require much finer grid cells. It will be very helpful and acuracy if GMS or rather Modflow try to adopt an unstructured grid to better simulate objects like sources, rivers, wells, etc. Have a good day
  10. Chaachoua Mohamed

    Unusual computed head in the last time step

    Hello, In the last time step, you have the cell get dry and by default the value of the head assigned to this cell is -888. Good day
  11. Chaachoua Mohamed

    Seawat

    Hello, If next versions of GMS will support SEAWAT, it will be a good and useful thing. Thus, we can benefit of the large possibilities and functionnalities of GMS to prepare data for a seawater or a variable density model. I want that GMS could calculate the depth of the salt water intrusion (this functionnality isn't available directly in other softwares Cordially
  12. Hello, Thanks for the reply. Yes, there is always a solution. I am used when working with models to create two 2D grids, one with a constant value of 1 and the second with a constant value of 0. When I want to multiply a parameter in an area by a factor, I select this area on my first grid and I change the value 1 by the multiplicatif factor. When I want to add a constant to the parametr of this area, I use the second grid and I change the value 0 by the constant to add. Using the Data Calculator feature I can add or multiply a factor for the selected area. It's faster than using Arc Hydro Groundwater and ArcMap. But it is still slower than selecting a set of cells directly into MODFLOW and change their values by multiplying or adding a constant. Thanks for all
  13. Hello, One of the relevant improvement of GMS is to have the possibility to select a parameter (K, S, etc.) assigned to a model by polygon or rectangle and change the selected values by multiplying them by a factor or by adding a constant. This possibility will reduce enormously the calibration time. Thanks
  14. Chaachoua Mohamed

    One layer to multilayer

    Thanks Sean for your promptness, I'll try to make Specific storage=0 for lower convertible layers and the specific yield the same as the original model. Actually, the lower layers are not confined and under pression and the subdivision is just artificial. Thanks for all
  15. Chaachoua Mohamed

    One layer to multilayer

    Hello Sean, Thanks for your help. Of course I have considered the lower layers as convertible. I work with GMS 6.0 (lpf mode) so i have only two options : unconfined or convertible. The problem is can I choice parametres (S, Kz) from the original model and how can I reaffect pumping data through all layers so that I obtain the same results like my original model. I have explained in my first message how I have done it but unfortunately I could not obtain the same results. Thanks for more help
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