Tutorial M04 Check Files QGIS

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.flt
• _zsh_zpt_check_P.shp
• _lfcsh_uvpt_check_P.shp

Review the check files:

1. Open the following files from the Module_04\TUFLOW\check folder:
   • M04_5m_001_DEM_Z.flt
   • M04_5m_001_zsh_zpt_check_P.shp
   • M04_5m_001_lfcsh_uvpt_check_P.shp
2. Use the 'Apply TUFLOW Styles to Open Layers'.
3. 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).
   
4. 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.
   
   
   
   
5. 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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