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  2. Interesting. I don't really have time to look into it further, so I'll brainstorm with you. I'm wondering if setting IPHDRY to a positive number could be causing the problem, depending on what you are setting HDRY at. Try putting IPHDRY to 0 to see what happens. The cell would then clearly not be available for particles. " IPHDRY is a flag that indicates whether groundwater head will be set to HDRY when the groundwater head is less than 1×10-4 above the cell bottom (units defined by LENUNI). • If IPHDRY=0, then head will not be set to HDRY. • If IPHDRY>0, then head will be set to HDRY. If the head solution from one simulation will be used as starting heads for a subsequent simulation, or if the Observation Process is used (Harbaugh and others, 2000), then HDRY should not be printed to the output file for dry cells (that is, the UPW Package input variable should be set as IPHDRY=0).
  3. Is that output line at the end showing top and bottom elevation of the specified cell (which appears to be reversed), or the head and the bottom elevation in the cell?
  4. I am running a transient MODFLOW scenario using the NWT solver with UPW. We are doing significant dewatering in this scenario and the water is drawn down through several layers (necessary due to geology). The MODPATh model will run for a while and then crash due to "cell thickness is negative in" some cell. I believe particles are entering cells where the CHD and NWT have the water table below the bottom of the cell which is causing MODPATH to crash. Is there any way to fix this? I already have MOODFLOW outputting head at the end of every timestep and the IPHDRY set to a positive number. Thanks for any help you can provide.
  5. Earlier
  6. Wrong forum. Move your question to the WMS forum.
  7. For those of you that happen upon a similar question that I had: Three parameters may be entered: T1, T2, D_sand. T1 and T2 are used to compute the reference Shields parameter THETA used in the Parker (1990) equation: THETA = T1+(T2-T1)*Exp(-20F_sand), where F_sand is the fraction of sediments on the bed surface finer than the diameter specified by D_sand in mm. The default values of the three are T1 = 0.021, T2 = 0.036, and D_sand = 1.0. This is a direct excerpt from Dr. Lai's current work on his sediment transport manual that will be coming out soon.
  8. I just recently started having a problem displaying the grid. I create the grid and it is visible, but as soon as I map it to Modflow, the grid within the model boundary dissapears. You can still see the grid outside the model boundary until you activate cells in coverage, then those grid lines as they should. I have played around with the display options in 3D Grid Data, but the cell edges will not display. I have this same problem on about 7 different GMS models. It seemed to just start about a week or two ago. Does anybody else have this problem, or know of a fix. I just figured out how to click on the zoom and pan button to turn on the contour label formatting, so I was hoping that there would be something similar for this.
  9. Hi all, I am in the midst of publishing a paper for a journal publication. To get right to the point, a reviewer asked me to differentiate between the Parker (1990) sed transport equation and the Wilcock-Crowe (2003) equation in the context of the model. The Parker coefficients have no shortage of explanations in most publications but The input coefficients for the Wilcock Crowe equation are less clear. They are listed as follows: Wilcock T1 coefficient = 0.021 Wilcock T2 coefficient = 0.036 Does anyone know what the "T1" and "T2" coefficients are related to? I checked the wiki and all it does is list these coefficients and gives no explanation. A google search also leaves me empty handed. Any direction would be greatly appreciated. thanks, Isaac
  10. Hi, I'm using SRH to model tidal inundation from a river into a wetland. The wetland is only connected to the river by 1 large culvert. In the SRH model, can a single culvert model flow in both directions? I seem to get flow into the wetland (which is the direction of flow according to the nodestring pair order). However as the water level drops on the upstream side of the culvert, the downstream side stays relatively level (as if the water doesn't flow back in the other direction). If a culvert does only work for one direction, does anyone have recommendations on how simulate flow in both directions? Maybe use two culverts, side by side? Thanks in advance! Any advice is greatly appreciated.
  11. Hello, I got the same error for RT3D, and it said all the species data are removed (instead of head in your case). In my case, I had a zero in denominator of my reaction file (rxns.dll). As soon as I added a constant to the denominator, the error disappeared. Hope this helps, Somayeh
  12. Hello all, WMS just had a recent update to this software application but when I tried to update this on my current PC I get an error that stops the install. The File 'CreateLinks.bat' is not mark for installation. Soon as this error is cleared it then shuts down the install wizard while stating: "WMS 11.0 64-bit setup ended prematurely because of an error. Your system has not been modified." Any help would be much appreciated. Thank you!
  13. Hi Bruce, can I ask you if you find out the solution for this issue? I am having probably very similar problem: I have observation values from different piezometers for which varies the filter depth. Different filterdepths falls into different modelling layers, therefore I look for solution how to obtain the residuals for some observation piezometers from first layer, for different ones from second layer and so on. So far I obtain in GMS always only one residual, and I am neither sure from which layer it is.... Do you, or anyone else have suggestion how to solve this problem? Thank you
  14. I think that the problem ended up being a conflict between GMS and our firewall "Comodo". GMS creates 5 or 6 batch files in the Temp directory every time you zoom or pan the display. It then executes the batch files sequentially to redraw the bitmap. Our firewall would send up a popup every time GMS executed one of those batch files because batch files can be a big security risk. These popups would often occur 300 to 500 times during a single GMS session. I tried turning the firewall off to avoid the warnings, and that is what caused GMS to stop displaying bitmapped graphics completely. But, I found that by uninstalling the firewall completely from the workstation, GMS started displaying bitmapped graphics again. Turning the firewall off was not enough, you need to uninstall it completely from your computer. So if you are having trouble displaying bitmapped graphics, you need to uninstall your firewall. Not a great thing to do, but you don't have much of a choice with the weird way bitmaps are redrawn in GMS. Hopefully this is the fix and GMS will continue to work. I will repost if the problem comes back.
  15. Thanks for the response. The drains are mapped via polygons and the drain elevation raster pixels are ~253m x 253m (derived from smoothed 1arcsec DEM) and the FD grid cells are 250m x 250m. Where the drains are applied are relatively flat, so I was hoping for better agreement. The seepage face option sounds promising - much easier to implement and less data dependence.
  16. How are the drains mapped? If they are from arcs, the elevations will not necessarily follow the variation in topography, especially if topography is irregular and node spacing wide relative to the grid. If as a polygon, for the same reason, elevations may not match if topography is irregular and the grid and raster resolution are not similar. Solutions are : Use the automatic layer range allocation with "Auto-assign BC to one cell", so they can go into the layer below if below the top layer (if that is conceptually acceptable) If using arcs, redistribute vertices more finely along the arc, to a similar spacing to the grid, convert them to nodes so it can have more variation over distance. Simplest and most robust option is to use a Seepage Face rather than Drain, so that the drain elevation in the grid is set relative to the upper cell top elevation. In your case set the “elevation offset” set to -1m.
  17. I have created a number of drains and getting 160 errors were the mapping of the drain elevation is bad. The raster value is the (surface elevation - 1m) [highlighted in lilac] is 13.1m. Cell elevation (based on surface elevation raster) is 14.18 m, bottom is 12.0. The mapped drain elevation is 11.3. WTH? I've deleted and recreated and mapped MODFLOW 3 times, no change.
  18. Hi everyone! I use the wms 9.0. I load dem (srtm) and I reproject it to local projection in wms. I encountered problem. When I want save the file, it gives message “out of memory” Please, how resolve this problem?. Notice that my computer has good performance. Thank you in advance.
  19. My solution was to use QGIS to first create a raster from the DEM that followed the rules above. Then I created a polygon shape for the entire grid and then used the Difference algorithm to cut away the other features in the region that are represented by polygon shapes, one by one, first the ocean, rivers, green and red areas, leaving a polygon that represented the exposed clay layer at the surface. I imported the polygon shapes and used the raster to define the CHD head stage value.
  20. Hi all, I Created a US Grid for a former MODFLOW 2005 model. When trying to run the model the executable crashed and the error message is *.hed file formatted incorrectly. When I look at the hed file, it is empty (0 KB). checking the simulation before running results with no errors. Any suggestions ? Thanks, Hila
  21. Hi all, I need to change hydraulic conductivity and porosity during my simulation running with PHT3D. As there are no transient material properties in the software, I want to run the model within a period of time (step 1) and then import the results from step 1 and change the material properties and then run the model as step 2. Do you think that I can do it and how? How I can import the results of previous model run to the new one?
  22. The files are local, but are on a different drive than the model files. I will try moving them to the GMS model directory and see if that helps.
  23. I experienced the same problem when working with the TIFF on the server. I saved the files locally on my computer instead, which solved the display problem.
  24. You can just select cells manually and change the conductivity in the properties dialog....or set up a coverage with polygons to change just small areas when it maps over to MODFLOW. Test it out so that you can confirm everything else remains the same when you map it over.
  25. Hi all I constructed my model using HUF flow package and i started calibrating the model. I need to change locally the hydraulic conductivity at some regions for calibration process, can this be done?? Another th ing that i wounder why when i select any cell in the grid , i find that its material assigned as limestone in the whole model (the figures are attached)
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