Tutorial M01 Time Series Plot Output QGIS

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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 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.

    Animation M01 PO 01e.gif

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 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.

    Animation M01 PO 02d.gif


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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