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Found 5 results

  1. Hello, For a very long time, I have been trying to create a numerical model of an aquifer with complex hydrogeology (by using borehole-to-Ugrid option). I had several layers of 4 different materials. But all my efforts were trash. Because, I have never obtain a successful Modflow-usg run. They never converged. Although wetting option was on, the aquifer had so many dry cells. And these dry cells were always at same locations (not near/at the location of wells). It was meaningless. I couldn't run the PEST. So I decided to make my system more basic and created a one-layer model with HK zones. It worked well without the wetting. I have applied pilot points approach for the calibration. And pest is working because the forward run has a successful result. However, this time the calculated residual is too high. I have done many things to decrease the error. But the best result until now is about 7000 (Sum of Squared Weighted Residual Head+Flow) and for Root mean squared residual it is 16. These values are so big. Interestingly, the computed vs. observed head plot (attached) looks not so bad that there should be a way to fit them to the line. I only have head observations in my hand and I don't have any flow observations data. May this be the problem? Or what may be the problem? Could you please help me on this? I would be so happy to hear your recommendations to lower my calibration error to an acceptable value. Note: The computed heads are higher than the measured heads. The boundary conditions are ; specified head along the coast and GHB condition was assigned to some part of the boundary. The model is steady-state. Thank you! Best, Cansu
  2. Hi there, I'm having a problem related with assigning specified flow boundary conditions to my UGrid / Modflow-USG model. The error appears when I do the '' Map to MODFLOW'' option while converting my conceptual model to UGrid numerical model. I have read the helping document saying that If you want to use ''Specified flow boundary condition'' the UGrid must be a stacked grid. A stacked grid is one in which there is no vertical discritization of layers and the horizontal discritization of all layers is the same. (i.e. the Index of Vertical Sub-Discretization (IVSD) in the UnStructured Grid Discretization (DISU) package could be set to -1) (See the Figure attached). Firstly, I did not understand what this means and how to find the IVSD in the DISU package and set it to -1 to be able to use specified flow boundary condition. In my model there are 2 groundwater divide boundaries which must be zero flow and 2 formation boundaries where the aquifer feeds from neighboring formations with a specified flow value. If I ll have to change my specified flow bound. cond. with something else or If there is a way to use them, could you please help me to find the solution? Thank You!
  3. I have a number of geological layers as TINs. They are situated at their respective depths yet when I attempt to highlight them all and convert to solid or UGRID they create multiple grids (or solids) for each layer (TIN). As I am new to the MODFLOW package, what is the simplest process for turning TINs (some do not cover the entire extent of the model) into a 3D block to model groundwater flow via particle tracking. I have attempted fill between tins and horizons, however, nearly all solids appear as below, mishapen and not extruding between the TINs as expected.
  4. huliogeordio4

    GMS Crash converting shape file to UGRID

    I'm trying to convert a series of shape files to Ugrid, some files convert within a second, however, 5 do not and crash the GMS software, only sometimes offering up an error message of the following: This machine does not have enough memory to continue this operation. Save your data and exit. (xms::CMainGMSFrame::OnCommand) Ive monitored my PC when running the conversion tool and memory never really spikes during the process. I also noticed that the crash isn't dependant on the size of the shape file with both larger and smaller files crashing when compared to those that converted successfully. Restarting the machine, as well as trying a different PC doesn't appear to have much effect. Cheers
  5. Greg

    Adding Layers in a UGRID

    Is there a way to split a UGrid layer into multiple layers in GMS 10.0 or 10.1?
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