Tutorial M04 Check Files QGIS GPKG

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Introduction

QGIS is used to import the check files and review the topographic modification cutting through the embankment, and the layered flow constriction.

Method

This tutorial introduces:

• _DEM_Z
• _zsh_zpt_check_P
• _lfcsh_uvpt_check_P

Review the check files:

1. Navigate to the Module_04\TUFLOW\check folder and open the M04_5m_001_DEM_Z.tif layer into QGIS.
2. Drag and drop the M04_5m_001_Check.gpkg from the Module_04\TUFLOW\check folder into QGIS.
3. Open the following layers into QGIS (hold Ctrl to select multiple):
   • M04_5m_001_zsh_zpt_check_P
   • M04_5m_001_lfcsh_uvpt_check_P
4. Use the 'Apply TUFLOW Styles to Open Layers'.
5. Use the 'Apply GPKG Layer Names'.
6. The DEM_Z grid shows the final elevations used for the model calculations. Change the styling and inspect the area of the embankment is lowered. See Module 2 for more information on how to review topographic modifications. Note: The DEM_Z appears different to the input DEM as the resolution of the DEM_Z is coarser (2.5m) than the input file (0.5m).
   
7. The zsh_zpt_check file displays the elevation points changed by Z shape topographic update and the TUFLOW styling provides an indication of the elevation difference.
   
   
   
   
8. The lfcsh_uvpt_check file shows the Zpts where the 2d_lfcsh is applied as a thin line. Only the cell sides have the flow constriction applied. The attribute table shows the values specified in the 2d_lfcsh and the final elevation of the invert level after applying the Z shape.
   
   

Conclusion

• The DEM_Z and zsh_zpt_check file was used to ensure the cut through was correctly applied to allow flow through the embankment.
• The lfcsh_uvpt_check was viewed showing the form losses and blockages applied to the thin line.

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