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Jeremy Croes

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Everything posted by Jeremy Croes

  1. Dear all, I am modelling a pair of extraction/injection wells and have noticed something very peculiar when varying the horizontal conductivity values of certain layers. I have attached two pics to this post. In my model, the top layer consists of 3 distinct layers which represent an aquitard (clay). Extraction and injection is occurring in the lower 5th layer. In the 2 figures the horizontal k-value for each of the top three layers are displayed. The only difference between the two figures is that the middle layer's conductivity value has been changed from 0.01 to 5 m/d. All layers have a ver
  2. Dear all, I have modelled two wells, one injecting and the other extracting. (See the two pictures that I have attached). There seems to be a difference between the side view in Orthogonal mode and the side view in a cross section that I made. If I'm not mistaken the cross section shows the General mode. In the cross section the fluctuations spread out more to the overlying layers than in the Orthogonal mode. This means that there is a larger fluctuation in layers closer to the surface in the General mode than Orthogonal. Can anyone explain the difference? Besides this little problem, I also
  3. Thanks again for the reply. I have checked the model with the model checker and found nothing unusual. I tried simulating the model with different amounts of recharge. Still get the same problem. I will check if changing the starting heads might help. Thanks again for the response
  4. Dear all, I was wondering if anyone had good tips on modelling wells (extraction as well as injection) in detail. The purpose of the model would be to simulate the functioning of wells and being able te predict their effect on the surroundings. Which flow package or solver is best suited to do this? Would Femwater be better than Modflow at this? Thanks for any advice. Jeremy
  5. Thank you for the response. I would like to produce the model without setting recharge. But just to check if it reproduces the error, I also modelled the same simulation with recharge. This still results in an error, mostly that the model does not converge.
  6. Dear GMS forum, I would like to make a very simple model of an extraction well. The purpose is just to visualize the influence sphere and the drawdown. The well is suppose to extract 20 m³/h, but only operate 6 hours a day. For this reason I'm trying to do it in a transient state as a steady state model gives errors. What would be the most simple way of doing this? The no-flow boundaries of the model have a very large distance from the well, so that they could not effect the well. Furthermore all layers except top are set as confined. I have also tried implementing a mirror well far from the
  7. I am trying to edit multiple coverages at once, specifically the model boundaries of each coverage. After running the model, I realized that the model area was too small, hence the problem. I am trying to do this by changing the node coordinates of each coverage's (layer) model boundary. All layers have the same nodes with the same coordinates. Depending on the amount of layers I have, this can turn out to be a lot of work. So I was wondering if I could select all coverages/layers at once and change certain features (e.g. node coordinates). Or is there another easier way? I have tried using th
  8. I have a question about the scale in cross sections. I´ve noticed that when I make a cross section and use a scale bar from the annotation data, the distance between my two modelled wells are different than when I measure the distance between those same wells when looking from the plan view. Also, this distance changes depending on whether I use the front or the side view. Is it possible to change this scale so that the cross section displays the "real" distance? Thanks in advance Jeremy Croes
  9. Hi all, First post! I am modelling a dual well construction (one injection, the other extraction) using modflow to be able to calculate the sphere of influence of the two wells. With regard to this, I had a general question about the contour layers. I was wondering at what depth the contour layers projected by MODFLOW occur. Do they occur at the top, at the bottom of the layers or are they an average of the difference in potential over the layers? I want to know this because I am using the differences in heads to calculate soil consolidation. Thanks in advance. Jeremy Croes
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