Tutorial M10 001 Check Files QGIS GPKG

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Revision as of 10:59, 14 August 2023 by Emilie Nielsen (talk | contribs)
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Introduction

QGIS is used to import the check files and review the dam break.

Method

This tutorial introduces:

Review the check files:

  1. Open the files, either:
    • Within the QGIS Browser Panel, navigate to Module_10\TUFLOW\check\M10_5m_001_Check.gpkg and double click the following layers, or
    • M10_5m_001_zsh_zpt_check_P
    • M10_5m_001_vzsh_zpt_check_P
    • M10_5m_001_sh_obj_check_R
    • M10_5m_001_grd_check_R
    • M10_5m_001_bcc_check_R
    • M10_5m_001_sac_check_R
    • In File Explorer, navigate to the Module_10\TUFLOW\check folder, drag and drop the M10_5m_001_Check.gpkg into the QGIS workspace and select the layers above (hold Ctrl to select multiple).
  2. Navigate to the Module_10\TUFLOW\check folder and open the M10_5m_001_DEM_Z.tif layer into QGIS.
  3. Use the 'Apply TUFLOW Styles to Open Layers'.
  4. Use the 'Apply GPKG Layer Names'.
  5. The DEM_Z grid shows the final elevations (at time 0) used for the model calculations. The elevation changes due to the dambreak are inspected in the Results section.
  6. The zsh_zpt_check file contains the Zpts modified by the 2d_zsh layers with updated elevation, change in elevation and source layer. The Shape_Width attribute is specified the same as the cell size, a thick breakline is used with entire cells being modified. The TUFLOW style colour codes the symbols based on the amount raised, or lowered.

    Animation M10 GPKG 001 Check 01.gif

  7. The vzsh_zpt_check file contains information on the elevation points that change over time, elevation change, final elevation and trigger conditions.
  8. The sh_obj_check file displays the TIN triangles created by TUFLOW during the model initialisation and is useful to review for all merge polygons.

    Animation M10 GPKG 001 Check 02.gif

  9. The grd_check is the 2D grid defined by the 2d_code layer and contains a region object for each cell with attributes, e.g. the IWL.

    Animation M10 GPKG 001 Check 03.gif

  10. The sac_check contains information on the lowest cells for each SA boundary region. The upstream 2d_bc QT inflow was replaced with a 2d_sa inflow.
  11. The bcc_check contains information on the 2D boundaries, it shows the cells conveying water out of the model selected by the 2d_bc HQ type boundary (based on a slope).

    Animation M10 GPKG 001 Check 04.gif


Conclusion

  • The topographic modifications representing the dam wall, dam break and initial water level were inspected.


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