FMA Challenge 2: Difference between revisions
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The embankments were removed by digitizing the polygons shown in grey in the images below, and using TUFLOW’s Z Shape functionality that creates TINs within the polygons whose perimeters are merged with the surrounding ground levels to erase the embankments. This is a very quick process to do and setup (about 5 minutes in this case), and there is no need to rework the original DEM.
Within the demo model, the embankment removal can be run using the scenario ''EMB''. With this scenario applied, TUFLOW will modify the topography by calling the layer ''2d_zsh_remove_ridges_001_R.shp''
The images below for the initial 30m grid run show the levels at the high water marks with and without the embankments at the two locations previously discussed. The red values are the 1964 HWMs, the blue values the without embankments scenario and the black values in brackets for the with embankments case previously discussed. An improvement in the calibration results tends to result.
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