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Found 11 results

  1. Hi All, I am trying to calibrate a MODFLOW model using PEST. My model has multiple layers (12). However, I do not know how to parameterize the model. Aquaveo tutorials explain it as specifying hydraulic conductivity and recharge values are negative values in different areas. However, I am not able to do this because my model is developed in such a way that these Hydro-geological properties are specified as a properties of materials and these materials are assigned to different areas in each layer. Would you please help me to parameterize my model? Thank you, Lalith
  2. 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 hig
  3. Hi, I have recently started using the UZF package to simulated groudwater flow in a regional model. I firstly developed a steady state model using spatially distributed recharge from a surface model. I was using the «recharge» and the «EVT» package. With this configuration i was able to obtain a water budget with % error < 0.001%. When i replaced the recharge and EVT packages by the UZF, the water budget output file shows a line with a component called «HORT+DUNN» which i suspect to be the surface runoff flow. This component is not well describe in the USGS MODFLOW documentation. The p
  4. Dear all I have trouble modeling a square site with different BC. at one side I have river (I put constant head as BC) and no problem in that for modeling. now, 1) at one side I have rock (no flow coming in or out from site at this side) and 2) at other side of square area I have no BC (I mean the water can flow out of area etc) what is the difference in modeling number 1 and 2? how to difine them in my model? my model currently have active cells in coverage so I think it means all sides I have rock, right? Thank you, Zara
  5. 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
  6. 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 gene
  7. I would like to be able to export the MNW1 package to a shape file or some other format. Or create point features. Is that possible? Not every modeling project begins from scratch. Many times you start with someone else's model (say a USGS model) and want to develop the map data/feature objects from that model. It seems like GMS doesn't serve that pathway of development well.
  8. Refining a regional steady-state model where the local grid boundary intersects rivers and drains (see image). I went through the tutorials for SS refinement. This model departs from that example in a couple of ways - flow field is not nicely uniform in area; and MF BCs are intersected. I created 4 arcs initially to set up the boundary of the local model. Then I started to wing it - created nodes at each intersection of 1' head contours to map constant heads to the arcs but I'm thinking that may not be the best way to go. Any suggestions on a strategy for mapping the heads and the BCs to
  9. Hi, I'm relatively new to the GMS software and have performed a few of the basic tutorials Aquaveo provides. I have XYZ data that provides spatial reference to every observed pressure points/head values. These points are evenly spaced/gridded. I would like to create a MODFLOW simulation with these pressure data. To my understanding, the best way about creating this model would be to generate a raster that stores XYZ and P data (GeoTIFF). Theoretically, I'd like to create a 3D grid that stores these X, Y, Z, and P data. From there I'm going to need to create an IBOUND layer that spe
  10. Hi Community, I am trying to run MT3D-USGS in a model which contains plenty of dry cells computed by mf2k5, but MT3D-USGS chrashes. The .out file reports that plenty of cells have "saturated thickness =0.0000" (i.e. they are dry), "not allowed in transport model" and furthers says "reset as incative". I have attempted to set some of the dry cells as inactive, but those cell still show up as erroneous in the output file. What am I missing, or what can I do to make MT3D-USGS work? - Niklas
  11. Hello everybody I noted GMS has values for porosity in both MODFLOW and MT3D. In MODFLOW menu (MODFLOW options) one can enter values for porosity, although porosity is not used in flow computations as far as I know. Also in MT3D menu it is essential to enter porosity value. In the model I have (which is a SEAWAT model) I entered values for porosity in the MT3D options, but I noticed there are different values -by default- in the MODFLOW options. Which values does the model consider in this case? and why is there an option for porosity in MODFLOW? Thanks
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