Tutorial M10 002 GIS Inputs QGIS GPKG

Introduction

QGIS is used to create, import and view input data.

Method

Setup the GeoPackage Database:

1. Navigate to the Module_10\TUFLOW\model\gis folder. Save a copy of M10_001.gpkg as M10_002.gpkg.

Increment the dambreak layer from Part 1 to change time trigger into water level trigger:

1. Load in the 2d_vzsh_M10_dambreak_001_R layer from M10_002.gpkg, either:

   • Within the QGIS Browser Panel, navigate to M10_002.gpkg and double click the layer, or
   • In File Explorer, drag and drop the M10_002.gpkg into the QGIS Workspace and select the layer.

2. Select the 2d_vzsh_M10_dambreak_001_R layer in the Layers panel.
3. Click on the ‘Increment Selected Layer’ symbol from the TUFLOW Plugin toolbar.
4. The tool automatically renames the 2d_vzsh_M10_dambreak_001_R to 2d_vzsh_M10_dambreak_002_R. By default the new layer will be saved into the same Spatial Database (e.g. M10_002.gpkg) and the previous layer superseded to TUFLOW/model/gis/ss folder.
5. Click 'OK'.
   
6. The tool removes the source layer from the Layers panel and the 2d_vzsh_M10_dambreak_002_R appears:
   
   
   
   

   
   

7. Right click on the 2d_vzsh_M10_dambreak_002_R layer to toggle on Editing.
8. Click on the 'Identify Features' tool and click on the polygon.
9. Update the following attributes:

   • Trigger_1: WL_Trigger
   • Trigger_Value: 60
   • Period: 0.5

10. Click 'OK' and turn off editing to save the edits.
    
    
    
    

    
    

Create a point to set the location of the water level trigger:

1. Click on the ‘Import Empty File’ symbol from the TUFLOW Plugin toolbar.
2. Select '2d_vzsh' from the Empty Type list.
3. In the Run ID box write 'M10_dambreak_002'.
4. Tick the 'Points' Geometry Type
5. Click on 'All to one' and make sure the layer is saved into the M10_002.gpkg database, hit 'OK'. The 2d_vzsh layer appears in the Layers panel.
   
6. Right click on the 2d_zsh_M10_dambreak_002_P and toggle on Editing.
7. Select 'Add Point Feature'.
8. Digitise a point within the dam upstream of the location of the dam break.
   
9. An attributes dialog displays, enter the following attributes:

   • Shape_Option: TRIGGER
   • Trigger_1: WL_Trigger

10. Click 'OK' and turn off editing to save the edits.
    
    
    
    

    
    

Conclusion

• A 2d_vzsh region layer was modified to simulate a dambreak based on water level at specific point.
• A 2d_vzsh point layer was created to set the location of the water level trigger.

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