Tutorial M01 Time Series Plot Output QGIS

Introduction

QGIS is used to create time series plot outputs. Two types are described:

• 2d_po line object - records average water level (_H) and flow (Q) across the line; and
• 2d_po point object - records water level (_H) and velocity (_V) in the cell where the point falls into.

Method

Create 2d_po line layer with the TUFLOW plugin:

1. Click on the ‘Import Empty File’ symbol from the TUFLOW plugin toolbar.
2. Select '2d_po' from the Empty Type list.
3. In the Run ID box write 'M01_001'.
4. Tick the 'Lines' Geometry Type and hit 'OK'.
5. The 2d_po_M01_001_L.shp appears in the Layers panel.
   

Digitise a plot output line from left to right looking downstream. The direction of the line is important, the opposite direction would produce negative values:

1. Make the layer editable and select ‘Add Line Feature’.
2. Digitise a line from left to right looking downstream across the floodplain and channel.
3. Populate the attribute table as follows:

   • Type = H_Q_
   • Label = Location1

4. Toggle the editing off to save the edits.
   
   
   
   

Create 2d_po point layer with the TUFLOW plugin:

1. Click on the ‘Import Empty File’ symbol from the TUFLOW plugin toolbar.
2. Select 2d_po from the Empty Type list.
3. In the Run ID box write 'M01_001'.
4. Tick the 'Points' Geometry Type and hit 'OK'.
5. The 2d_po_M01_001_P.shp appears in the Layers panel.

Digitise a plot output point in the channel where the 2d_po line crosses the channel:

1. Make the layer editable and select ‘Add Point Feature’.
2. Digitise a point within the channel where the line crosses the channel.
3. Populate the attribute table as follows:

   • Type = H_V_
   • Label = Location1

4. Toggle the editing off to save the edits.
   
   
   
   
   

Conclusion

• The 2d_po layers were created, containing a line recording flow and average water level across the line and point recording water level and velocity.

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