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Hydrology

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Everything posted by Hydrology

  1. I have just upgraded to GMS 10.4 and I am having a compatibility issue with GMS and our Network security. Apparently with 10.4, whenever a graphics file, like an aerial photograph, is displayed, the program creates a temporary batch file that it executes and then erases. This happens for each aerial file you have in your project, and the batch files are created each time you pan or zoom your display. These batch files are considered security risks by our security software, and I get a pop-up asking me to allow/not allow the batch file to run each time I move my display. Each batch file has a different random name for each time the display is redrawn, so we cannot add an exception to our security software for the batch file. A typical name is C\Temp\GMS_21380\img00247_image2.out.bat. I have 9 aerial files in my project so I have to click OK on the security pop ups 100 or more times during a working session with GMS. Is there any way to have GMS not produce these batch files.
  2. Are the pumping rates interpolated between time periods? I have pump totalizer data on irregular time steps and I am trying to make sure that I am representing them correctly in the pump time series. In the example below I show the date and the totalizer readings in (gals). I convert the total gals to an average gpm computed over the time period since the last reading, then to a ft3/day for input into modflow. Does modflow interpolate the flow between time steps, or does it use a specified flow rate for each time step until another one is specified (stepped pump rate). For example is the pump rate on 3/13/12 in the example below 0.00 ft3/day, or is it 77.33 ft3/day? I want to make sure that I get the mass balance for pumped volume correct. Date gals) (gpm) (ft3/day) 3/12/12 0.0 0.0 0.0 3/15/12 5,212.0 1.2 -232.3 3/16/12 8,674.0 2.4 -462.8 3/19/12 9,752.0 0.2 -48.0
  3. Thanks. I will try that.
  4. Is there a way that I can rotate the display so that north is not straight up? I have an existing model and I would like to rotate it around 45 degrees before I make an animation of groundwater drawdown due to pumping.
  5. Thanks, that is what I ended up doing after tech support pointed me in the right direction. So far it seems to be working, although the AVI files are coming up with different horz and vert values, so i can't combine them. I am going to try and generate them again, being vary careful not to change the plan view window in the GMS interface. I think that the AVI size is set by your window size, so if you change or move your GMS window, the video size changes.
  6. Hi, I am trying to make an animation of drawdown contours that spans several models. The first model is a transient run from Time-1 to Time-2 and reflects a specific model condition. I then duplicate that gms model and remove a barrier. I then run this second model in transient mode from Time-2 to Time-3. The starting gw level for the second model is set at the 3d surface of the last step from the first model. I can create animations for each of the two models and merge them together. This works fine for actual gw elevation contours, but it does not for drawdown contours, because the drawdown for model 2 starts at the starting gw for the second model, not the starting gw of the first model. It need to have the second model calculate the drawdown from the starting gw of the first model for the drawdown contours to be continuous between the two models. Is there any way to get the second model to use the first models starting gw elevation for the drawdown calculations. Any help would be appreciated.
  7. Sometime over the last few weeks the grid lines for the 3D grid in modflow have stopped being visible. I have been using GMS for many years and have never had this problem. They are visible when you create the grid, but become invisible once you map your model to MODFLOW. They are highlighted in the 3D grid options in the Display Menu, but are still not visible. This started happening on all our computers pretty much at the same time
  8. I would like to know the answer to this as well. I have often had problems trying to use more than 200 stress periods. I don't know if it makes a difference how many time periods you have for each stress period or not.
  9. I have created materials in a GMS model, and assigned the materials to different modflow layers. The material characteristics such as hydraulic conductivity that I have assigned to each material do not seem to be mapped to the layers in the modflow model. If I assign Hk and Hv within each layer's attribute table it works correctly, but when I assign materials to a layer it does not seem to work. Am I doing something wrong?
  10. Never mind, I rebooted my computer and now it seems to be working ok. It still does not ask to use the refine points, but it is using them anyway.
  11. I am trying to create a 3d grid for a modflow model. The model will not use the refine points when I go from map to 3d grid. About 1 out of every 6 times that I try to create the grid, it will ask me if I want to use the refine points, but even then, it still does not use them. The interface goes to the default grid creation menu with nothing grayed out. The cell size and bias should be grayed out. I tried to create the grid in GMS 10.0 and 10.1 and I get the same results. This is a small simple 2 layer model with 4 wells, nothing else. I brought up an old working model from last year and tried to recreate the grid, and GMS will not use the refine points in that model either. Last year this old model worked perfectly. Is anybody else having problems with refine points?
  12. Thanks, I guess that I forgot that second step.
  13. It seems that the "Layer Contours to Arcs" command no longer works in GMS 10.0.5. I get a dialog box that says it has completed, but there are no shape files in the output directory. The function also does not ask the same questions that previous versions of GMS asked. Is this command still supported?
  14. I was thinking that maybe the grid had gotten corrupted, so I deleted the grid frame and grid. Then created a new grid frame and grid. I created a new modflow model and mapped my model to modflow. On the first run, the whole of layer 1 was brought down to elev. -3.5. No slope, just a flat gw elev across the whole model, it seemed to ignore all of the boundary conditions. I then remapped the model without changing anything and ran it again. This time it picked up the boundary conditions and wells correctly, the the groundwater drawdown is different from any of the other runs that we have had.
  15. I have also noticed that on some runs, areas within the upper layer of the model dry out. They are discontinuous random blobs of dried out cells. These are in areas of the model where absolutely nothing should be happening. They are a long way from where my well is, plus, the well does not go to the bottom of the layer, so nothing should ever dry out. The well is not drying out, so things further away from the well should definitely not dry out. Sometimes when I rerun the same model, the whole grid dries out.
  16. I tried to check the 64bit box in the Global settings for MODFLOW thinking that it might give me greater accuracy, but the program immediately crashes when I try to assign a starting head to the model if the 64bit box is checked. Update, I don't think that it is the 64bit check box, because it sometimes happens without it being checked. It seems that if you run it one time without setting the starting gw (ie let the gw default to the top of the layer), then set the gw to the correct elevation prior to the second run, then GMS wont crash. By the way, you get a different answer if you set the gw vs if you let it default to the top of the grid.
  17. I have tried ver. 9.2.6 and ver. 10.0.4, and I get the same varying results. The differences are not small. I am running a pump test and the latest 2 runs show a drawdown of 5.7' 25 ft. away from the pump well and the next run showed 6.6 ft' drawdown 25 ft. away from the pump well. Both measurements were taken at the same cell. I am using Modflow 2005, Parallel, with the PCG2 solver. I will email the files to you.
  18. Can you have an unstable MODFLOW model that still converges every time? I have a steady state model that runs to completion each time, but it gives me a different answer each time I run it. If I run the model over and over I get the same answer. But, if I close out GMS, then reopen GMS and run the model, I get a different answer. Or, if I change a k and remap, then change it back to the original and remap, I can get a different answer. This is driving me nuts and its put this project way behind schedule. Any help would be appreciated.
  19. I have been using vertical drains as wells in my model. This works ok as long as the drain is in the upper most layer. But, when the vertical drain runs through several layers, the adjacent cells in the upper layers go dry and then there is no lateral inflow into the drain/well from these upper layers. The water then has to flow vertically down into the next layer and then horizontally over to the drain. This causes the water level in these adjacent cells to rise inappropriately. It seems like I need to somehow model a seepage face along the vertical drain column to allow water to continue to simulate flow into the well casing. Is there any way to allow the water in the cells adjacent to my drain to continue to flow into the drain/well?
  20. Thanks, I have been using PCG2, I will try PCGN. I don't see SAMG, is that an add-on package to buy?
  21. Hi, I am trying to get Modflow to run in parallel but have not had any success. When I look in Task Manager I see "mk2k_h5_parallel.exe" running, but it is only using one processor (6% CPU utilization ie 1 of my 16 cores). Is there something else that I need to be doing to get it to access some of the other 16 cores that I have on my machine? I would think that a finite difference model would scale quite well in a parallel environment.
  22. Hydrology

    Barrier Extent

    Does a barrier always extend completely through a layer. You can set the default layer range for a barrier and you can also set the elevation of the bounding nodes at each end of a barrier arc. Which one controls?
  23. What is the difference between the "Specified Head (CHD)" and the "Specified Head (IBOUND)"? They seem like they are doing the same thing.
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