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Found 62 results

  1. Dear all, I am trying to model a “subsurface dam” using the Horizontal Flow Barrier (HFB) package which simulates thin low-permeability geologic features to impede the horizontal flow of groundwater. I have a model with two alluvium layers which are shown in the attached schematic figure. In the HFB package, the cell boundary represents a vertical face between two adjacent cells. The question here is how I can define a barrier within one cell (layer) up to a specific level rather than the whole cell thickness (like layer 1 in the figure). Your help and insight would be highly appreciated. Best regards,
  2. We are about to start a 3D dam seepage model. We have done several similar models over the last few years in a finite element, unstructured mesh model code similar to FEMWATER. This time, we've decided to start with a MODFLOW model due to funding and scheduling issues. I've been wondering if a MODFLOW-USG model will meet our needs, and eliminate the need to switch to an FEM model sometime in the future. I took a MODFLOW-USG class several years ago, and have been looking for an opportunity to use it, but have not stayed up to date with the current condition of the interface in GMS. I've done a little testing over the last few days, and I see two possible hindrances. I think I've got workarounds for both, but wanted to see if anyone else had additional ideas. 1. We definitely need to be able to look at a cross-section of the dam and show head contours on the cross-section. With a regular grid, this is straight forward as long as your cross-section is along a row or column. I don't see any cross-section cutter in the USG model. With an unstructured mesh, we are used to using the control key to select a line of elements to isolate. I do not see that that hotkey is available with an unstructured grid, but it looks like we can select and isolate a group of cells and get a similar effect - either draw a box or select with a polygon. Is that our best bet? 2. Once we have the model solution, we compute a factor of safety against uplift at all the surface nodes in the FEM model - basically we need the gradient for upward flow. We have an external code that will automatically do this for an unstructured mesh by comparing heads and elevations at nodes located at the same x,y location. If we use a regular structured gridded MODFLOW, the computation is pretty trivial using the MODFLOW arrays for the centroid elevations and computed heads and the data calculator. I am not finding the same options in the unstructured grid. I realize that the grid is not required to have layers and that the computational points are not necessarily at exactly the same x,y locations, but it seems that the only way to build the unstructured grid in GMS is with layers, so if you're using the GMS interface, it's likely a layered USG. At this point, I'm thinking writing an external code or maybe an excel macro may be my only option here and I can probably steal code from the routine we use on unstructured meshes. Is there anything I'm missing in the GMS interface that could help me here? Thanks for your advice.
  3. Hi there, When I want to map my conceptual model on UGrid (Unstructured Grid) , it works till 6% and then it shows the following error: "Boost. Geometry overlay invalid input exception" I stuck in this step and I need your precious help. Any points would be highly appreciated. Many thanks in advance for your time and help.
  4. Hello Dear Alan and GMS Users, I’ve prepared boreholes, cross section and stratigraphy solids using GMS Version 10.4. I created first 2D Quadtree UGrid and then I selected Horizons -> UGrid from Borehole menu to map Horizons (Solids) to the 3D UGrid (Quadtree). I faced the following error and I cannot figure out how I can solve the problem: “No dataset defined for scatter set Horizons. Cannot continue” Your prompt help and response would be highly appreciated.
  5. hi everybody, How do link GMS and Matlab software? can you give me any instruction for this, please? This case is very much emergency for me, It will be very helpful if you can share your experiences or suggestions. It will be very much appreciated. All the best,
  6. hi everybody, How do link GMS and Matlab software? can you give me any instruction for this, please? This case is very much emergency for me, It will be very helpful if you can share your experiences or suggestions. It will be very much appreciated.All the best,
  7. GMS 10.3 has been Updated! The 64-bit full installation can be downloaded here. The Tutorials can be found here. Bug fixes can be found here.
  8. Hey all! I have a question regarding boundary condition set up. I am working on a regional model of an large aquifer field which is used for drinking water purposes. Hydrologic and hydrogeologic conditions are at this stage of the research verry clear. We are dealing with open aquifer field where boundary condition is representing inflow to the aquifer from surrounding sedimentary formations. We have calculated the infow using National groundwater recharge model and at this stage we have data of infow (Q [m^3/s]) for every cell of the boundary condition. Is it possible to calculate the needed hydraulic head in order to simulate the boundary conditions as constant head?
  9. Hi everybody, Both of groundwater modeling system(GMS) and surface water modeling system(SMS) are well known. Is it possible link them to evaluate flow exchange and pollution transport in river-aquifer interactions? Thank you for even the slightest mention about this. Azade
  10. GMS 10.3 has been Released/Updated! The 64-bit full installation can be downloaded here. The Tutorials can be found here. Bug fixes can be found here.
  11. Hi all, A bit of a simple question but I can't find the answer anywhere in the help files. I've been provided with some ARCGIS TIN's (.adf files within the TIN folder) and I'm struggling to import them into GMS. Is there a conversion that must be completed before this will work or am I missing something really simple as GMS just spits out errors at present. Thanks in advance M
  12. Hello, I am struggling with exporting the river coverage to shapefile - mainly I want to export the nodes with its ID and the head stages to shapefile I do it in standard way: Export Coverage - and choosing the .shp extension. Then I can export arcs and point file (polygon no as my coverage doesnt contain any polygons). The shp with arcs is exported without any problem, but what I am mainly interested is the shapefile with points. That is created but it doesn' t contain any data. (it contains just the names of attributes, but under that novalue). Is there any problem? According to gms wiki, should be possible to export head stages of rivers. My aim is to export GMS ID of nodes of the coverage (to have the information of X, Y coordinate and GMS ID), so I thought exporting to shapefile would be the easiest way. Is there any other possibility how to export ID of the Nodes with its XY coordinates from coverage to some format that can be then easilly processed (e.g excel,?) Thank you for any advice (I am using GMS 10.1.05) Petra
  13. GMS 10.2 Has been Released!The 64-bit full installation can be downloaded here.The Tutorials can be found here.Bug fixes can be found here.
  14. Hi everyone, I am currently doing a project regarding in-situ chemical oxidation of BTEX using persulfate solution, and trying to use RT3D to represent the process. As reading the literature the reaction should be a pseudo 1st-order kinetic reaction model, but the only relevant option I found in the reaction package is the inst. aerobic degradation of BTEX which only offers oxygen as the electron acceptor. In this case, could someone familiar with the persulfate or other similar oxidation mechanisms tell how to construct the RT3D model? convert the persulfate concentration to an equivalent oxygen concentration? or should I try more options other than MODFLOW? Regards Dylan
  15. Currently you can not get cell to cell flow budgets with MODFLOW-USG. This is a feature that can really help troubleshoot problems and analyze if the model is behaving correctly. Any plans in providing this in MODFLOW-USG?
  16. It would be great if you could add a feature to save the locations of your toolbars. If this is already a feature then please let me know the steps to save them. Thank you - Greg
  17. Hi all, I have come up with some errors when running the tute model of TUTE: MODFLOW – Generating Data from Solids that indicate “changing heads are below the bottom of cell xxx". It is so weird that a tute brings up a problem like this. Having read a thread in the forum suggesting to remove the BC of constant heads from the sources sinks coverage, I found many cells dry out with red triangular flags after a modflow run. I knew it was different from what is instructed in the tute sheet, but it seems plausible for me that without those BC these cells could dry out. A further question is, i was constructing a more complex multi-layer solids model and tried to convert to modflow. My BCs are constant heads set on the arc of the coverage boundary, kind of surrounding my small catchment of interest, and they are definitely all below the bottom of my first, second and part of the third layer, so how to define the default layer range? (i.e. from 1 to 1, 3 to 12 as I have 12 layers in total, or 1 to 12?). PS: in this coverage I define wells, specific head, layer range for source sink and layer range for areal properties, and tick used for BC option. The first trial I have set was 1 to 12 (dont know if appropriate), converted map to modflow, and could see the blue dots assigned from layer1 to 12 of my conceptual model. All of them indicate the some heads I define in the coverage. (Really? Does it have to be a 58 m head in the even very bottom of my rock layer of 30 m elevation?). As expected, the model warned that lots of heads were below cells' bottom. When removing all of them in sources sinks and running the model in steady state, I found it never converge. A feeling was that I did it wrong when defining BCs. This is where I got confused. Could anyone kindly help? I am using GMS Version 10.0 Thanks for any help Rgds Dylan
  18. GMS 10.1 Has been Updated!The 32-bit full installation can be downloaded here.The 64-bit full installation can be downloaded here.The Tutorials can be found here.Bug fixes can be found here.
  19. Just came up with a question regarding where to apply different solution schemes for the advection package activated in the MT3D or RT3D model, and the cases are based on the tutorials 1. Can someone please explain further why we choose the Standard finite difference method for both the Sequential anaerobic degradation and BTEX degradation with multiple electron acceptors, MMOC for the Rate-limited sorption reaction, MOC for both Instantaneous aerobic degradation and Double-Monod model, 3rd order TVD (ULTIMATE) for all MT3D tutorial cases, etc. If there were relevant recommended reading resources, that would be greater. 2. In the Rate-limited sorption reaction tute, what is the meaning of changing Max. number of cells any particle will be allowed to move per transport step to 2 in the Particle dialog of the Advection package? 3. How to save multiple solutions as a .rts file like what it supposed to import in the Rate-limited sorption reaction tute. Because each time I ran the model it would overwrite the existing solution with a new solution of both Aqueous and Soil given a certain mass transfer coefficient. How to come up with a solution with different runs (i.e. different mass transfer coef in one solution file? Thanks, Dylan
  20. I am a junior learner running through the general tutorials of MODFLOW, GMS and have come up with some confusion relating to the steps. 1. What happen to the right part of zone 3 with a constant recharge rate when importing csv file automatically matching zone name? The other zones are assigned correctly except for this part of zone 3. 2. In the tutorial it states the stress periods should match three changing point of recharge rate, i.e. 1/1/1986, 1/3/1986, 1/7/1986 (actually it is four including 1/10/1986). What is the purpose to set 1/5/1986, 1/6/1986 and 1/9/1986 etc. since no change takes place at these time? In addition, this should assume all the recharge polygons have the same changing points of rate over the space, so what if we have different change in time of these zones, say 1/3/1986 for zone 2 and 1/4/1986 for zone 3 etc. How to set stress periods for this scenario?
  21. Hi, I've been trying to calibrate my transient model using PEST, however I'm experiencing some difficulties. It executes the estimation process and finishes the parameter estimation but it fail's to give me any new values for the chosen parameters. This only happens when I try to calibrate it as a transient model. When I run it in steady state there are no problems and it estimates new values for my parameters. When I run it as a transient model there is a message in the PSLAVES windows that pops which states that the "Total sum of squared, weighted residuals: NaN", and I think the problems lies here. However I'm not sure how to fix it. If anyone has any idea what's causing this and could help me with a solution I would be very grateful. Jonas
  22. Hello all, We do have a license for Modflow-Surfact which I tried to use through GMS by running it as a third-partly executable but with no luck. No outputs were generated. Does any one has experience with running Modflow-Surfact with GMS? Thanks Mahmoud
  23. GMS 10.1 Has been Updated!The 32-bit full installation can be downloaded here.The 64-bit full installation can be downloaded here.The Tutorials can be found here.Bug fixes can be found here.
  24. GMS 10.1 Has been Updated!The 32-bit full installation can be downloaded here.The 64-bit full installation can be downloaded here.The Tutorials can be found here.Bug fixes can be found here.
  25. Hi everyone, Can any of you help me with the following question please? I am a beginner of GMS modelling. I want to set up a transient modflow of trench pump testing, however I don't know how to conceptualize the trench. The trench is 100m long, 2m wide, 1m deep, with 7 observation bores locating around the trench. The water levels of trench and bores were logged for 5 hours with pumping rate 1000L/min, and I need to set up a modflow and calibrate the model. The Drain (DRN) package seems not suitable for conceptualizing the trench as the water level of trenching decreasing with time. So can I set up the trench as 5 wells with the pumping rate 200L/min each, or any other suggestions how to deal with the trench please? Thank you for any advice/suggestions in advance. Best regards, Lucy
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