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Found 3 results

  1. Hello everyone! I'm building a multilayer model with GMS (MODFLOW-USG) for a region in Portugal and i start the calibration fase. Can anyone tell me the best way to calibrate my model? I'm thinking about to using the pilot point method, but i cant find a tutorial on how to proceed for calibration of multilayer models... Can anyone help me? Thanks in advance
  2. Hi All, I have a multilayer model. The model has been developed using conceptual method. Model has three sides. Two sides are rivers. 3rd side is a regular boundary and it’s hard to get a good calibration (45 degree line initially) assuming the 3rd side is no flow boundary. Therefore, I like to specify lateral flows across 3rd boundary based on its heads and other properties. I also like to specify downward flow from the bottom of the model (sandy layer at the bottom)3. I tried GHB along the 3rd boundary. Currently, GMS let us specify GHB only for a range of layers (say from layer 5 though 9). Is there a way that I can specify GHB only for selected layers along this boundary (say layer 5, 8 and 9 only)? I very much appreciate if you can explain how I can do above three things. Thank you, Lalith
  3. Recently I've been experiencing issues trying to implement more soil layers into my model. The model which worked fine with classic G&A redistribution infiltration routine suddenly produces weird results with G&A multilayer routine. The only change I made was switching to multilayer routine and assigning the depth of all layers. No matter what the depth was, disregarding any less permeable second layer I tried to introduce - the model always produces the same hydrograph with the peak as much as 20x higher then before and much faster response to all precipitation pulses. Moreover, when I tried to assign less permeable parameters to all layers, the peaks reached astronomic values, the model responded with NEGATIVE infiltration and the discharge volume reached about 200% of precipitation total. Does anyone has similar experience and/or suggestions, what went wrong? I suspect there's a numeric calculation bug inside :-) Thx Ludek S. CTU Prague
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