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  1. Today
  2. Dear GMS users and experts, I am doing my groundwater flow simulation using Aquaveo GMS 10.4.6 version. Do you have any experience in doing calibration and uncertainty analysis by using GMS model? Could you please share some tutorials or examples? Thank you very much for your help, Best regards, Sakura,
  3. Yesterday
  4. It may be easier to merge the mesh coverages, then mesh them. To do that, in the project explorer window, click on one of the mesh map coverages you want to merge. Hold the control button, and click on the other mesh/meshes coverages. Then, right click and select merge. This may be the problem you are having with the meshes (not having 2 selected). Make sure you have more than one selected (use the same procedure as above) to merge. Let me know if this helps or not.
  5. Tamis

    Merge Meshes

    I've been trying to merge two meshes just like it says in the help: https://www.xmswiki.com/wiki/SMS:Merge_2D_Meshes However, when i make right click, doesn't happened anything. is some kind of problem with the tool, or another way to merge meshes? Thanks! Tamara
  6. Last week
  7. arto

    Modflow - modpath

    I have a one grid layer steady state modflow model in gms 10 . When I put one particle at a distance of 100 meters away from the intake well, it entered the well in 70 days with default porosity value of 0.3. Material K value is 0.002 m/s. Then I changed the porosity value to value 0.01 and after running modflow again, GMS informs that particle enters the well in two and a half days. I"m "confused", when there is less amount of effective pores available for ground water to move then GMS tells that water moves faster (from one place to other) ?
  8. Hi Fadoua, Please read the following document Chapter 11, Snowmelt of Part 630 Hydrology in National Engineering Handbook. It includes two formulas for snow melt, when raining and when no raining. Regards Rashid
  9. Hi Fadoua, Please read the following document Chapter 11, Snowmelt of Part 630 Hydrology in National Engineering Handbook. It includes two formulas for snow melt, when raining and when no raining. Regards Rashid
  10. Hi Fadoua, Please read the following document Chapter 11, Snowmelt of Part 630 Hydrology in National Engineering Handbook. It includes two formulas for snow melt, when raining and when no raining. Regards Rashid
  11. Hi After version 12, raster module was incorporated into the GIS module. Old raster module did provide contour control in display option, but newer version don't. Is it possible to add this feature back? I know this can be converted to scatter & control the contour, but if several large raster files been loaded and do convertion, this seems not practical.
  12. Earlier
  13. As the title states, I am looking for a working example of a 2dm mesh file with E6T elements (six node quadratic triangles). The information on the SMS wiki is incomplete and contradictory - see highlighted image below. Source - xmswiki.com/wiki/SMS:2D_Mesh_Files_*.2dm The "Format" and "Sample" items The most complete information that I've found through Google searches is from a Department of Defense document from 1999 - see highlighted image below. Source - gmsdocs.aquaveo.com.s3.amazonaws.com/fform30.pdf Following this example, I created the attached file "test_2dm_e6t_single_element.2dm" in an attempt to create a single E6T element like the one shown in the image above. The file is read and the nodes are recognized, but not the element is not read resulting in an error. Any help would be greatly appreciated! test_2dm_e6t_single_element.2dm
  14. There is a Flow budget vs. time plot that you can use from the plot wizard.
  15. Turn on the "save text copy" option in the MODFLOW Basic package.
  16. New user here. I have survey data in a DWG file, I believe I reprojected it correctly (to a state plane). But, when I bring it into SMS it shows up somewhere in Nevada (should be in Colorado).
  17. Hi, I'm using Hec-hms snow melting and accumulation module. And I would like to know what formulation it uses of temperature index formulas? it does include the heat brought by rain? Thanks, Fadoua
  18. Hi, I have a problem regarding flooding and wetting which makes it difficult to calibrate the model. It is representing a coastal area with thin clay layers and sandy till which we assumed to be 1 m each. The two bottom layers represent rock with the upper one being fractured and thus have a higher hydraulic conductivity. The surfaces are imported from ArcMap and ranges between 30 and 0 m. constant head and no-flow was assumed.The main problem I found is that the groundwater table is almost completely flat in contrast to the terrain. Any ideas of packages, solvers or any tips in general, of how we can tackle the issue. We are thankful for any answers that could help us!
  19. 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).
  20. 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?
  21. 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.
  22. Hello, Can anyone please tell me that how velocity is calculated from flow data in GMS(not through GUI). Though I had already referred to the following the link: https://www.aquaveo.com/blog/2012/05/15/velocity-vectors ,the velocity calculated by me is not matching the velocity obtained through GMS. I had applied the following for the calculation of velocity: V = Q/(saturated_area*porosity); where, Q is the flow through a cell face, obtained from ccf file, Saturated area = (head-bottom_elevation)*cell_width {for unconfined aquifer} and head is obtained through .hed file. Thanks in advance. Have a great day!
  23. Wrong forum. Move your question to the WMS forum.
  24. 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.
  25. 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.
  26. 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
  27. 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.
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