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Lalith

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About Lalith

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  1. Hi All, I am trying to calibrate a MODFLOW model using PEST. My model has multiple layers (12). However, I do not know how to parameterize the model. Aquaveo tutorials explain it as specifying hydraulic conductivity and recharge values are negative values in different areas. However, I am not able to do this because my model is developed in such a way that these Hydro-geological properties are specified as a properties of materials and these materials are assigned to different areas in each layer. Would you please help me to parameterize my model? Thank you, Lalith
  2. Hi All, I am trying to calibrate a MODFLOW model using PEST. My model has multiple layers (12). However, I do not know how to parameterize the model. Aquaveo tutorials explain it as specifying hydraulic conductivity and recharge values are negative values in different areas. However, I am not able to do this because my model is developed in such a way that these Hydro-geological properties are specified as a properties of materials and these materials are assigned to different areas in each layer. Would you please help me to parameterize my model? Thank you, Lalith
  3. Hi, I have created MODFLOW model for a region near the coastline and It ran successfully in both steady and transient state. Currently there is no sink or source terms to make the model simple. Once the model achieve a stable solution, they will be added later. Then, I tried to run it in with SEAWAT and model shows the error that Memory is not enough. I tried both Parallel, 64Bit options as well as both of them in combination but did not get any luck. The way that I ran the SEAWAT model is as follows. I assume that I did it correct but please let me know if you have any alternative ways. 1. Run MODFLOW in steady state. 2. Change the model and output to transient state. 3. Assign steady state heads in step 1 above as the initial heads for the run. 4. Map MODFLOW to the grid. 5. Map MT3DMS to the grid. 6. Run SEAWAT. My model grid has 512 x 646 x 12 cells (12 layers). Number of total and active cells are 3,969,024 and 1,416,464 respectively . Since I did not have any success in running the model in GMS, I decided to run the SEAWAT model in text based USGS format. I exported the MODFLOW model from GMS to the regular text based USGS format. However, I do not see such a format change for either MT3DMS and SEAWAT option in GMS. 1. I assume that either MT3DMS or SEAWAT does not require such a conversion. Please correct me if I am incorrect. 2. Also, I think that the SEAWAT name file in the SEAWAT folder that GMS produces (.swn file) may not be the correct one to run SEAWAT in USGS format because the type, format, number of files and the content in the files are different. Please see the files and sizes of GMS and USGS formats of MODFLOW in the screen shots below. Can you please advise me how to make the name file to run in USGS format using these GMS files? I am planning to use the USGS version of SEAWAT executable and/source code to run the model since Aquaveo executable might have been customized to its data file types and may not match the requirements. Please let me know if you have any suggestion on this. I very much appreciate all your thoughts, suggestions and help to resolve this issue. Best regards, Lalith
  4. Hi, I have created MODFLOW model for a region near the coastline and It ran successfully in both steady and transient state. Currently there is no sink or source terms to make the model simple. Once the model achieve a stable solution, they will be added later. Then, I tried to run it in with SEAWAT and model shows the error that Memory is not enough. I tried both Parallel, 64Bit options as well as both of them in combination but did not get any luck. The way that I ran the SEAWAT model is as follows. I assume that I did it correct but please let me know if you have any alternative ways. 1. Run MODFLOW in steady state. 2. Change the model and output to transient state. 3. Assign steady state heads in step 1 above as the initial heads for the run. 4. Map MODFLOW to the grid. 5. Map MT3DMS to the grid. 6. Run SEAWAT. My model grid has 512 x 646 x 12 cells (12 layers). Number of total and active cells are 3,969,024 and 1,416,464 respectively . Since I did not have any success in running the model in GMS, I decided to run the SEAWAT model in text based USGS format. I exported the MODFLOW model from GMS to the regular text based USGS format. However, I do not see such a format change for either MT3DMS and SEAWAT option in GMS. 1. I assume that either MT3DMS or SEAWAT does not require such a conversion. Please correct me if I am incorrect. 2. Also, I think that the SEAWAT name file in the SEAWAT folder that GMS produces (.swn file) may not be the correct one to run SEAWAT in USGS format because the type, format, number of files and the content in the files are different. Please see the files and sizes of GMS and USGS formats of MODFLOW in the screen shots below. Can you please advise me how to make the name file to run in USGS format using these GMS files? I am planning to use the USGS version of SEAWAT executable and/source code to run the model since Aquaveo executable might have been customized to its data file types and may not match the requirements. Please let me know if you have any suggestion on this. I very much appreciate all your thoughts, suggestions and help to resolve this issue. Best regards, Lalith
  5. Please try removing the porosity from your equation. Probably, the model calculates the Darcys Velocity , which is simply equals to Q / saturated_area.
  6. Please make your solids bit larger than the conceptual model domain. When solids do not completely cover the grid, this error can occur.
  7. Please make your solids bit larger than the conceptual model domain. When solids do not completely cover the grid, this error can occur.
  8. Hi, Is there a way to obtain a time series of the variation of constituent concentration at a selected grid cell in MT3DMS? Thank you, Lalith
  9. Hi Sean, Thank you very much for your prompt response. Best regards, Lalith
  10. Hi All, This is more a fundamental GW question than modeling. Does MODFLOW steady state modeling use the Specific storage (S) in its groundwater flow calculations? I have an inherited steady state MODFLOW GW model where Specific storage (S) is left as 0 but model works. In the model, the hydraulic conductivity, longitudinal dispersivity, and porosity values are specified. Just trying to understand if the simulation results are correct. Your responses and suggestions are very much specified. Thank you, Lalith
  11. Please let me know how this works.
  12. Hi Ted, There are 3 approaches. 1. BC's are marked in red dots can also be specified along red lines. Model will try to better interpolate. the BC's. 2. You can go bit further in this approach as follows by specifying heads along contour lines (basically digitization). If your contour lines are in the form of either CAD or GIS shapefiles, then you can convert them to a line feature easily and specify them as Specified Heads (for All layers or selected layer range). You need to activate the layer range for that if you have multiple layers. 3. Go for MODFLOW-USG
  13. Hi Sakura, I didn't get a chance to read the forum in a while. Sean has given you all the correct advice. You are in good hands. In summary, I would try running the model and would not worry about the warning at this stage.
  14. Lalith

    Sarath

    http://gmstutorials-8.0.aquaveo.com/SEEP2D-SheetPile.pdf this is another similar approach
  15. http://gmstutorials-8.0.aquaveo.com/SEEP2D-SheetPile.pdf this is another similar approach
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