Tutorial M10 002 GIS Inputs QGIS

Introduction

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

Method

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

1. Navigate to the Module_10\model\gis folder and open the 2d_vzsh_M10_dambreak_001_R.shp in QGIS.
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.
5. Select to remove the source layer from the workspace.
6. Click 'OK'.
   
7. The tool removes the source layer from the Layers panel and the 2d_vzsh_M10_dambreak_002_R appears:
   
   
   
   
8. Right click on the 2d_vzsh_M10_dambreak_002_R layer to toggle on Editing.
9. Click on the 'Identify Features' tool and click on the polygon.
10. Update the following attributes:

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

11. 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 and hit 'OK'. The 2d_vzsh layer appears in the Layers panel.
   
5. Right click on the 2d_zsh_M10_dambreak_002_P and toggle on Editing.
6. Select 'Add Point Feature'.
7. Digitise a point within the dam upstream of the location of the dam break.
   
8. An attributes dialog displays, enter the following attributes:

   • Shape_Option: TRIGGER
   • Trigger_1: WL_Trigger

9. 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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