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Lalith

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  1. Hi, Could you please tell me if a SEWAT model can be calibrated using PEST in GMS? This model was calibrated in the mode of MODFLOW using PEST. However, it does not take the effect of the salinity wedge intruded inland along the coastline (although the GMS set up of this model includes all MODFLOW, MT3DMS and SEWAT and salinity wedge and associated coastline boundary conditions). Using the calibrated hydraulic conductivities, vertical anisotropies and recharge rates, The model was run in SEWAT form but water levels are much higher than the calibration targets now because the salinity wedge is holding the water flowing towards the ocean. Therefore, I think it is best if the calibration can be done using SEWAT itself rather than using MODFLOW. Please let me know if you have a different opinion. I appreciate it very much. Thank you, Lalith
  2. Hi, Could you please tell me if a SEWAT model can be calibrated using PEST in GMS? This model was calibrated in the mode of MODFLOW using PEST. However, it does not take the effect of the salinity wedge intruded inland along the coastline (although the GMS set up of this model includes all MODFLOW, MT3DMS and SEWAT and salinity wedge and associated coastline boundary conditions). Using the calibrated hydraulic conductivities, vertical anisotropies and recharge rates, The model was run in SEWAT form but water levels are much higher than the calibration targets now because the salinity wedge is holding the water flowing towards the ocean. Therefore, I think it is best if the calibration can be done using SEWAT itself rather than using MODFLOW. Please let me know if you have a different opinion. I appreciate it very much. Thank you, Lalith
  3. Hi, I have a SEAWAT simulation with the constituents in it. It was developed using GMS. I also saved the model in regular text based form of USGS. I am using this USGS format to conduct simulations. It has 44 stress periods. I want to run the simulation for a shorter duration (starting date does not change but only the ending date changes). I changed the number of time steps in .dis file (NPER) but simulation continues all the way to the end (44 stress periods). Then, I also changed the relevant time step information in .btn file (NPER – record 3, NPRS – record 16, TIMPRS(NPRS) - record 17, record A21s) and then simulation does not progress. Can you please help me to run the simulation to run for a shorter duration in USGS form? Thank you, Lalith
  4. Hi, I have a SEAWAT simulation with the constituents in it. It was developed using GMS. I also saved the model in regular text based form of USGS. I am using this USGS format to conduct simulations. It has 44 stress periods. I want to run the simulation for a shorter duration (starting date does not change but only the ending date changes). I changed the number of time steps in .dis file (NPER) but simulation continues all the way to the end (44 stress periods). Then, I also changed the relevant time step information in .btn file (NPER – record 3, NPRS – record 16, TIMPRS(NPRS) - record 17, record A21s) and then simulation does not progress. Can you please help me to run the simulation to run for a shorter duration in USGS form? Thank you, Lalith
  5. Hi Michael, Thank you for the prompt response and clarification. I tried the screen levels instead of the layer range and it works. Best regards, Lalith
  6. Hi, I have a MODFLOW/SEAWAT with 12 layers. There are pumping wells in the model that runs through multiple layers (the screens go through multiple layers). Please see how I included the well information in the conceptual model. These wells are supposed to be screen through layer 6 through 8 and each pump is supposed to extract 757 m3/day as you can see. I saved the model in the native text format also in the model set up so that I can also run the model in the command prompt. When I look through the .wel file I noticed the pumping rates are assigned in the following way in the grid cells. It looks like each layer at a given pumping location (grid cells with same i and j) are assigned with the pumping rate provided in the conceptual model. If that is the case, each pumping well is pumping three times the rate that was assigned in the conceptual model. When I assigned the pumping rate in the conceptual model, I was imagining that this 757.6 rate will be divided among the three layers. Please let me know if I have assigned the pumping rates correctly in the conceptual model? Thank you, Lalith
  7. Thank you Alan. It worked. I appreciate your response.
  8. 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
  9. 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
  10. 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
  11. 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
  12. Please try removing the porosity from your equation. Probably, the model calculates the Darcys Velocity , which is simply equals to Q / saturated_area.
  13. Please make your solids bit larger than the conceptual model domain. When solids do not completely cover the grid, this error can occur.
  14. Please make your solids bit larger than the conceptual model domain. When solids do not completely cover the grid, this error can occur.
  15. 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
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