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isiarkos

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  1. Dear Hisham & Michal, the procedure you mention, I think, refers only to steady-state models and we have already applied it in this type of simulation with no problem at all. In this case, we run a transient simulation so, as far as I know, we have to import the shapefile first (without the recharge information), convert the shapefile to feature objects and then assign the time-series with the recharge values to those features (using text import wizard and selecting "transient polygon data"). But the conversion procedure creates a large number of features, since we have multipart polygons, and the recharge value assignment does not properly done.
  2. Thank you very much for your quick response! Yes, that is exactly the case… The shapefile I imported contains multipart features. However, it is great of importance that these multipart features remain as multipart after conversion to feature objects (because they will be used as recharge zones). Therefore, I would like to ask: a) Is there a command in GMS (i.e. something like “single part to multipart features”) that converts back the new split features into multipart? OR Is there a way to prevent GMS from splitting multipart to single part features during conversion (when executing the command “shapes to feature objects”)? OR c) Is there another solution in terms of maintaining multipart features during conversion to objects?
  3. Hello, I have imported a shapefile containing multiple polygons (553 polygons). When i tried to convert the shapefile to feature objects (command "shapes to features objects"), GMS creates more than 553 polygons-features (about 5000! polygons-features). For example, a single polygon with a specific ID, when converted, is split into multiple features with the same ID. How can this issue be addressed? It is important that during conversion to keep the same number of features as the initial number of polygons of the imported shapefile. Thank you in advance!
  4. isiarkos

    Problem with transient simulation

    Hello everyone, I have a problem with a transient simulation regarding the head convergence. Initially, I created a steady-state model which run properly. I used a uniform aquifer thickness (250m) (interpolating top and bottom from gis data), 5 layers and as regards the boundary conditions, I used constant head boundary conditions (south boundary) and general head boundary conditions (north boundary). For aquifer type I used the convertible option, while for the extraction wells I used MNW package. The simulation run properly, but the result was some dry cells mostly in the first layer (image). In order to conduct a transient simulation, I used as initial heads the results of the steady one. Moreover, I copied the results and dropped them into a spreadsheet, doing a search and replacing all dry cell results with a "0" while assigning to the rest the value "1" in order to create an IBound file. I tried to run the model, but it didn't converged. Also, I tried to use other solvers, but the result was the same. When I'm using the confined option in the LFP package there are no such problems as it is expected. Can you please give some tips on what may be the problem and what to do in order the transient simulation to run properly with the convertible option? Thank you!
  5. isiarkos

    Problem with SEAWAT

    Hello, I conducted two simulations, both a steady-state and a transient one, trying to simulate seawater intrusion in a coastal aquifer. At first, I used MODFLOW and MT3DMS without taking into account the density difference between seawater and freshwater. Then, I tried to use SEAWAT both for the steady-state and the transient simulation. But the models didn’t run. I tried to run them both in 8.1 and 9.0 versions of GMS. The model grid consists of 100x100m cells and 5 layers. Regarding the steady-state simulation an error occurred and the model crashed. More specifically the message says: “This file is not a GMS MODFLOW superfile. Assuming NAM file. Using NAM file:… Executable crashed”. For the transport simulation, I divided the simulation period into 360 monthly stress periods (30d length each). Regarding the transient simulation, which uses as initial conditions the results of the steady-state, the model runs, but it stops and the message says “GCG SOLVER FAILED TO CONVERGE FOR ONE OR MORE SPECIES”. In this case, the simulation period was divided into 102 seasonal stress periods (212d & 153d length = 365d, 1 year). Can you tell what is the problem in each situation and what am I doing wrong?
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