Saubhagya Singh

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Everything posted by Saubhagya Singh

  1. Hello respected members, The problem mentioned by me in the question above is still unresolved. I tried running MODFLOW model on both 2000 and 2005 version. The problem can also be seen in the example files provided in the Goswami/Clement Experiment** ( I tried changing few things but nothing helped. ANy help in this regard would be really appreciated. Thanks and Regards Saubhagya
  2. Dear members, I am trying to generate velocity vectors in a density dependent model. The GMS is displaying error, pic of which is attached below. I have been generating velocity vectors and never faced any such problem. I am not able to work out solution to this problem. Any help would be appreciated. Thank You
  3. Any information would be very helpful. Thank You
  4. Hi, It might be very basic question but I am struggling with it. Is there a feature in GMS to display streamlines after MODFLOW simulation? Thank You Saubhagya
  5. Thanks a lot
  6. Hi, I was wondering if it is possible to export toe position for each time step, for a particular isochlor while modelling seawater intrusion using SEAWAT? Thanks Saubhagya
  7. or I think, even exporting a particular contour line should also work for me. Is it possible?
  8. Good Morning, I tried doing this but couldn't find the right file to do this? Basically the task for me would be to find the location of cell with a specific concentration in the lower most layer of the aquifer, at each timestep. So the file having data of concentration in each cells at each timestep should work for me. Thank You Saubhagya
  9. Yes, that should work. Thank you very much Alan for the suggestion. Regards Saubhagya
  10. Hi Alan, Toe position would be the x-coordinate of point where a particular concentration contour (iso-chlor) would meet the base of the aquifer. Thanks
  11. Hi, I am trying to simulate a SWI in coastal aquifer (transient). The aquifer is 1500 m long and 40 meter deep, and is discretized as 1500 cells by 80 cells. I am running the model for 50,000 days and apparently the model would take 9 hours. I have attached my time-discretion details. Am I doing something in an inefficient way? Would putting some different values to multiplies would help? Any help to reduce run time would be appreciated. Thanks
  12. Hi, I am trying to run a simulation for a very long duration (more that 80,000 days). Last few MT3D simulation crashed probably because the folder containing MT3D files exceeded 10 GB in size. This brought few queries in my mind. 1) Are such a huge MT3D file sizes normal? 2) What settings/criterion in GMS controls the file size? Is it time step size or cell sizes? Does Max number of inner and outer iterations affect the sizes of files? 3) To start with, what is the best way to estimate the optimal grid spacing and time step size? If model is huge and takes time to set up, trying different grid spacing can be tedious. These questions are bothering me since a long time. Answers would really be appreciated. Thanks and Regards Saubhagya
  13. Thank you very much. That was really helpful.
  14. P.S.: Can "multipliers" be useful to reduce file sizes?
  15. Hi, I am simulating a confined aquifer problem. My cell size in the grid is 1m by 0.5m. When I run MT3D simulation, it get crashed before completion. Please let me know what can be the reasons to it and what changes should I consider making in my model. I have attached the picture of simulation progress window. Thank You
  16. Also, I have attached picture showing settings of my GCG solver
  17. Thanks Alan for the help. I checked output file of MT3D as suggested by you but couldn't find any clue at the bottom of the file. I have provided link to the file here below (upload restriction due to size limit). If possible, please have a look and guide me how to debug my model. Thank You Sincerely Saubhagya
  18. Hi, I am trying to simulate a scenario where the boundary head is gradually varying with time. Another scenario I am trying is to simulate coastal aquifer with seaside boundary head varying as per tidal variations of sea level. As far as I know, in given stress period the specified head remains constant. Therefore continuous head variation cannot be achieved and it has to be approximated by series of step changes. This will result in huge number of stress periods. Is there any alternate more efficient way to simulate such scenario? Thanks in advance. Saubhagya
  19. I am not able to find a way to give constant concentration boundary condition in Grid Approach. The option is only for starting concentration. Any help in this regard will be appreciated. Thank You
  20. I am trying to simulate HENRY's problem in SEAWAT. But I would like to remove the effect of density on flow and simulate uncoupled flow conditions. Can anyone suggest how to do that? I tried to make slope of density to concentration equal to zero then that doesn't seems to be working. Thank you
  21. Thanks Bill. It was really helpful
  22. Hello Everyone, I have a doubt in specifying no-flow boundary condition, Should it be done with making specified flow 0 , or should it be by horizontal barrier? Any help will be appreciated, Thanks in advance Saubhagya
  23. Thanks Alan, Still can you tell will both methods goes fine with no flow boundary ?
  24. I have 2 doubts. 1) How can we give thickness of auifer, is it same as lentgh in Z direction of 3-D grid mapped form modflow? 2) How can we give recharge from auitard. Is seepage face used for same purpose? Saubhagya