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Lalith

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About 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 salinit
  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 salinit
  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
  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
  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
  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 altern
  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 altern
  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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