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robinb

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  1. Hi! Im wondering if there's any way to create a "flow pattern" with directional arrows in a vertical section of a model in GMS/MODFLOW? Preferably the size of the arrows should be proportional to the flow. Something like this: http://www.emeraldinsight.com/content_images/fig/1340120701039.png WIth regards, Robin
  2. The ability to logaritmize the legend values for easy view of for example different hydraulic conductivities that can change greatly between depths and materials.
  3. I have built a coarse model over my system and is running MODFLOW, MT3D and SEAWAT one after another without error, except for when i run SEAWAT. At the end of the run, with the message of a succesful completion I get an error message saying : "The following dataset(s) were invalid and have been removed from the project: Head, salt" Why does this happen and how do I stop it happening? With regards, robinb
  4. Hi Im trying to modell the drawdown and the drawup of brine by simulating seepage into a tunnel. The modell is in 2D, width and "height/depth". I'm wondering what the best way to do this is. DRAIN seems to be a good way to take the seepage/leakage into the tunnel away from the model because as I have understood it, it couples the head and the seepage to each other. The question is, how do I calculate the conductance-parameter, or should I just try different values to get an appropriate value of the seepage? How is the DRAIN affected by the elevation and head above? Is the elevation-parameter the level at which the drain/tunnel is situated or the head above? Is there any way to easily create a gradient of brine in SEAWAT? The brine is has more salt at deeper depth in the area being modelled. Is this the best way to modell the situation, or do you have any other way to suggest? WIth regards /robinb
  5. I redid it and it now works. Now I'm trying to make a stochastic capture zone risk analysis as described in the "Stochastic modelling, indicator simulation", but all i'm getting is a probability/dataset of 1 everywhere. In the individual simulations the pathlines changes and seems correct. Any idea?
  6. I'm getting an error when trying to use the risk analysis for stocastical modelling on a group of 5results. It's MODPATH that crashes and displays: . . . Reading WELLS for Period 1 Time Step 1 STARTING LOCATIONS NOW BEING READ FROM FILE... STARTING LOCATIONS HAVE BEEN READ FROM FILE NUMBER OF VALID PARTICLES = 0. RUN STOPPED. I have generated particles at the wells and followed your tutorial. Pathlines are also shown in normal view. Any idea what could be the problem?
  7. When having simulated a t-progs situation, is there any way to change the properties for e.g. recharge automatically for the individual cells? For example if there is clay on the uppermost layer, i would like to remove the recharge for these cells in all the realisations of t-progs. How do i perform this?
  8. How could it be that the modell won't calculate when I add a constant head boundary? IBOUND = -1 and a starting head value or by use of time.var.spec.head (CHD1) when having more than one layer in a modell?
  9. Hi I'm trying to simulate the groundwaterlevel in an area by using borehole data and T-progs. I'm encountering a couple of problems that I'm nog quite sure how to solve. One is that the simulated waterlevel changes drastically between the cells. Two cells that exist next to each other can have a resulting head of 40m and 10km. The difference between them is that one is sand and the other is clay. I would have hoped that they be more equalised by flowing to the sides? Any ideas what could be the problem? When running the modflow simulation i got the results that they didn't converge, but when i check the box "Do not stop on non-convergence" or something simular under the convergence options i get the results that the simulation finished succesfully after 25 iterations, instead of the 24 made without the option checked. Could this be part of my problem, that the simulation doesn't really converge and only seems to do so? Hope someone can shead some light onto this. Regards, robinb
  10. Hi again, thanks for all the help. Some more questions that has occured to me: When adding the starting head, is it a must to add it to all the layers? How can i solve "The starting head is lower than the bottom elevation in layer 1"? Maybe it has something to do with the first question? I suspect that it is that i need to only add the starting head to the layers that is within the starting heads grasp. I have a starting head that varies greatly within the modell and i have quite a few layers in the grid. Therefore i hope there is some practical way to do this. And "Error: The Changing Head Boundary Condition is below the bottom elevation of cell i=1, j=90, k=1, in stress period 1." I have read the tutorials and they have given me guidance in some other questions but I have not seen any reference to these problems and hope you can help me. With regards, robinb
  11. I found a bug (a software one) when deleting boreholes from the borehole editor. The removed borehole stays on the map but changes name to borehole(1) even though it is not longer present in the project explorer.
  12. Im not sure if i'm inserting the borehole data in the right way. How should i "end" the stratografy? To show that the borehole ends, but not indicate that there is nothing below it? The boreholes that end in impermeable bedrock i put as material_-1. At the moment a borehole input is put like: 0.0 material_2 material_2 0 -45.0 material_4 material_4 0 -68.0 material_2 material_2 0 But the borehole ends at -80 but the stratografy doesn't. How do i indicate this? I'm also wondering how i couple the elevation of the ground to the borehole data? /with regards robinb
  13. Finally i've gotten the license key and started building my model. Just to make sure i don't do anything stupid when creating the boreholes. I hope it's possible to couple the stratography to the surface (so that 0 is the later added surface elevation) and it is not needed to take the surface elevation into account when creating the boreholes? I've already created around 50 holes and would like to avoid recalculating them.
  14. Hi I'm just about to start my master thesis that is about modelling well-protection zones stochastically. I will be using the stochastic modelling module for GMS/MODFLOW and the MODPATH module as well as the risk analysis wizard. I'm wondering if these modules are much more demanding than just using GMS/MODFLOW as I am thinking about investing in a new laptop. I have been reading in on the subject and wonder if there is any more specific information about what the stochastic module can do as i have not yet recieved the license for that particular module? I'm also wondering what the difference is between 7.1 and 8? There might be a possibility to use 8, but neither I or my professor has used it and i wonder if there is any benefits/advantages to use version 8 or will it just take time to get used to a maybe new interface? With regards /robinb
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