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About gmmorrison

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  1. I would be interested to know the outcome of this, as we recently had the same problem applying vzsh using lines. We ended up resorting to using polygons as needed a quick answer.
  2. We had been using the 2010-10-AC build, after changing to the 2012 build it now works! Thanks for the help Gillian
  3. I have tried to set up a model using the Scenario options, however it appears that you cannot use the If Scenario command in the ecf file. Is this correct? We were trying to specify different network and cross-section files depending upon the scenario (such as blockages), however TUFLOW appears to try and read all networks listed, ignoring the If Scenario and Else If... statements. Is the only option to create a range of ecf files for each scenario and read the relevant file from the tcf using the If Scenario commands? Thanks Gillian
  4. Thanks for the replies. It's definitely not file size, the dat files are a max of 60Mb. The error message I'm getting is "Error reading from binary file (card)". The model does indeed have Code -1 cells in to block out the river channel. We have been using build 2011-09-AD with double precision. Is this likely to be due to the bug Phil? Gillian
  5. We have recently upgraded a couple of machines to 64-bit and therefore now have the 64-bit version of TUFLOW. However we are now finding that the TUFLOW results will not always load into SMS. We only have older SMS versions 9.0 and 10.0 in demo mode. Has anyone else come across this problem or is it specific to my model? If other 64-bit TUFLOW users can let me know what they use I would really appreciate it. Thanks in advance Gillian
  6. gmmorrison

    Code cells

    Hi I was wondering if anyone knows how TUFLOW decides which cells to apply a code polygon to? I assumed the boundary of the polygon would activate cells if it passed through their "cross-hairs" as boundary lines do. However I found that this doesn't seem to happen, as seen in attached picture. I realised this when I snapped SX bc lines to the edge of my code polygon (to link with an ISIS model). When I ran the model I had alot of warnings that inactive codes have been activated by the SX lines. Thanks Gillian
  7. Thanks to both of you. It all makes sense now!
  8. Im having problems using WLL lines to output my 1D ISIS results in TUFLOW. I seem to have set them up correctly. I have an ISIS Nodes layer for the nodes and an ISIS network layer with the centreline going from up to downstream. The WLL lines are drawn from left to right with the middle vertex snapped to the node. The WLL lines and node locations are taken from the georeferenced ISIS cross section (the node location is set where the bed marker is). The model runs and I get no error messages, however when I looked at the WWLp check file the elevations in no way correspond to my ISIS cross section! (see attached pic) Im really not sure where the values have come from, they dont correspond to the zpt values either. Does anyone have any suggestions, or can explain how TUFLOW finds these values so I can try and figure out where its going wrong?
  9. Richard Me and my colleagues have found the same problem. I think it must be a bug in TUFLOW? The only ways we have found of getting round it is by specifying the width to be wider than 1.5 times grid size, ie. grid of 5 m set Shape_Width equal to 8. This then produces a WIDE line, which isnt ideal but seems the best option when using a Zsh. Otherwise just revert to using a Zln using the THICK and GULLY options. Gillian
  10. Hi I'm having problems linking 2D domains in my model. I've constructed a model with a 30m grid which has four 10m grids nested within. It's a tidal area so the river levels fluctuate alot. The links seem to be working fine except where they cross some of the rivers where I get strange flow patterns, originating from the edges of the water extent. I think its to do with the water levels at dry nodes being interpolated across causing an uneven water surface profile, as shown in the rough sketch attached. Is this what TUFLOW does? So far I have tried altering the locations of the nodes (many times!) and changing the zpt values in the 10m domain along the boundary to equal the ZC value in the 30 m domain. I'm now out of ideas and welcome any suggestions. I've also attached are the river cross sections for the two rivers causing problems, the Blackwater and the Colne, showing the node locations and the minimum water levels. Thanks gillian water_interpolation.bmp
  11. Hi I'm having some problems using a Z Shape layer where not all the zpts have been correctly lowered. In my Z Shape layer I have a line with elevations snapped at each end, the option is set to MIN and the shape width is 10 (smaller than my grid size which means a thin line is produced). This seems to have worked at first glance, however I noticed water backing up in the model and so have had a look at the check files. The sh_obj_check file shows the line which should be lowered as I expected, however looking at the aztual zpts there is one point which has not been altered. This isnt because it is already low enough. In the attached picture this can be clearly seen circled in red - the thin blue line is the line in my Z Shape layer, the black dashed line is the sh_obj_check layer and the yellow triangles are the zsh_zpt_check layer. Does anyone know why this has happened? Any suggestions would be most welcome. Thanks in advance Gillian
  12. Hi Was wondering if anyone had any experience with using more than one variable Z shape which overlap? Im trying to model an embankment which breaches at a certain time (which I have represented using a Z shape triggered at a set time) and then is fixed so many hours later (which Ive represented using a seperate Z shape which is triggered at a later time). The model runs fine with just the first breaching Z shape, the elevations are lowered correctly at the correct time. However when I add the second Z shape to fill the hole, this seems to occur simultaneously with the first Z shape even though the trigger time is different. Ive looked at the _vzsh_zpt_check file and all the zpts look like they should be altered at the correct times to the correct values. However when I look at the _ZH output from the model run the embankmment does not collapse, but alters slightly, at the time of the breach. The fact the embankment alters slightly has lead me to believe the embankment is being filled straight away. Any help would be greatly appreciated gillian
  13. Hi Paul Thanks, that works and seems much simpler! Will use this approach from now on! Would still be interested if anyone knows if there is a way to do this with the zsh file though, and why I was getting such random results?
  14. Hi I'm trying to raise the elevation of all the buildings in my model by 0.3m. I have all the buildings represented as polygons in a zsh layer and have set the Z attributes to 0.3 and the Shape_Options to "ADD". This results in the buildings being raised - but by about 30 m! I have even tried setting the Z values to -1 to see the effect and this still results in the elevations increasing by 30m. Is this the correct way to use the zsh layer to do this? I dont really want to have to add points/lines to every building as there are alot of them in the model!
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