TUFLOW CATCH Tutorial M04 GIS Inputs QGIS

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Introduction

An interventions (2d_im) layer is created to filter out pollutants around the paddocks and within the waterway.

Create Interventions

An interventions (2d_im) layer contains one or more lines, called devices. In the TUFLOW CATCH Control file, parameters are assigned to these devices which remove pollutants fix wording here. TUFLOW CATCH will write an interventions summary that describes the total flows, masses entering and masses removed for all intervention devices and pollutants.

Create the 2d_im layer using the TUFLOW CATCH plugin:

  1. Go to Processing > Toolbox from the top dropdown menu options to open the Processing Toolbox.
  2. Go to TUFLOW Catch in the processing tool list and select 'Import Empty'. This opens the dialog shown below.
    • Project Directory: Click ..., and navigate to the TUFLOW_CATCH_Module_04\Modelling folder.
    • Empty Type: Click ..., and tick on '2d_im' from the empty type list.
    • Geometry Type: Click ..., and tick on 'Line'.
    • Run ID: TC04_001
  3. Click 'Run'. Once the tool has finished, click 'Close'. The 2d_im_TC04_001_L will appear in the QGIS Layers panel.

    File:Image of dialog

To help determine where the intervention devices should be placed, load in the following files:

  • 2d_mat_TC01_001_R.shp from the TUFLOW\model\gis folder
  • TC03_001_catchment_hydraulic_d_Max.tif from the TUFLOW_CATCH_Module_03\Modelling\TUFLOWCatch\results\grids folder

Create interventions:

  1. In the QGIS Layers panel, select (left click) 2d_im_TC04_001_L and toggle on editing.
  2. Select 'Add Line Feature'.
  3. Digitise a line around the corner of the paddock with material ID 9. Use the right mouse button to terminate the line, and an attributes dialog will appear. Set the ID to 'trench1' and click 'OK'.
  4. Repeat the same process as above to digitise a line between the road and the paddock with material ID 7. Set the ID to 'retentionBasin'.


  5. Zoom in to the downstream end of the model. Use the TC03_001_catchment_hydraulic_d_Max.tif to determine where the water will be flowing. Using the same process as above, digitise a line perpendicular to the water on the western side of the stream. Set the ID to 'bufferStrip1'.


  6. Create two more intervention devices with ID's 'trench2' and 'bufferStrip2'. Use the image below as a guide.

    File:Image of devices with labels turned on

  7. Once all the devices have been created, turn off editing to save the edits.


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