TUFLOW CATCH Tutorial M01 GIS Inputs QGIS

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Introduction

The required boundary (2d_bc), materials (2d_mat) and culvert layers are supplied and inspected. The culvert layers are supplied from TUFLOW Tutorial Module 3. A receiving polygon is created to track the pollutant mass fluxes at the downstream end of the model.

Review Supplied Input Files

A number of model input files have been provided in the TUFLOW_CATCH_Module_01\Tutorial_Data folder. Copy the following GIS files into the Modelling\TUFLOW\model\gis folder:

  • 2d_bc_TC01_001_L
  • 2d_mat_TC01_001_R
  • 2d_bc_M03_culverts_001_P
  • 2d_bc_M03_culverts_001_L
  • 2d_bc_M03_culverts_001_R
  • 1d_nwk_M03_culverts_001_L

Investigate the supplied files:

  1. In Windows File Explorer, navigate to the Modelling\TUFLOW\model\gis folder. Drag and drop the above layers into QGIS.
  2. Click on the 'Apply TUFLOW Styles to Open Layers' symbol from the TUFLOW Plugin toolbar.

    Tuflow plugin styles open layers.png

  3. The 2d_bc_TC01_001_L layer contains the downstream boundary:
    • It is a stage-discharge (HQ) boundary with a 1% water surface slope
    • This layer contains the downstream boundary from TUFLOW Tutorial Module 1. The upstream boundary was removed as TUFLOW CATCH is designed for whole of catchment analysis so independent hydrologic inflows are not necessary.
  4. The 2d_mat_TC01_001_R layer contains the spatial definition of material types:
    • It is a supplementary material file to 2d_mat_M01_001_R, which is used in the TUFLOW tutorials. For more information, refer to TUFLOW Tutorial Module 1.
    • An aerial photo of the model area was used as a guide to create the regions in this materials file. This image is supplied in the TUFLOW_CATCH_Tutorial_Models\Aerial_Photo folder.
    • Material ID 5 represents brush, while Material IDs 6, 7, 8 and 9 represent pasture and correspond to paddocks A, B, C and D respectively. These materials are discussed in further detail later in this tutorial.


  5. The other supplied layers represent culverts. For more information, refer to TUFLOW Tutorial Module 3.


Create Receiving Polygon

A receiving polygon (2d_rp) is a single polygon that covers the downstream receiving waters. The TUFLOW HPC cells within the polygon will be excluded from the TUFLOW HPC simulation. TUFLOW CATCH generates summary time series files that report the total water and pollutant mass fluxes entering the polygon. The receiving polygon must encompass the downstream 2d_bc boundary (2d_bc_TC01_001_L).

Create the receiving polygon (2d_rp) 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: This should automatically be set to the TUFLOW_CATCH_Module_01\Modelling folder.
    • Empty Type: Click ..., and tick on '2d_rp' from the empty type list.
    • Geometry Type: Click ..., and tick on 'Region'.
    • Run ID: TC01_001
  3. Click 'Run'. Once the tool has finished, click 'Close'. The 2d_rp_TC01_001_R will appear in the QGIS Layers panel.


  4. In the QGIS Layers panel, select (left click) 2d_rp_TC01_001_R and toggle on editing.
  5. Select 'Add Polygon Feature'.
  6. Digitise a polygon similar to below. Ensure that it encompasses the downstream 2d_bc boundary. Use the right mouse button to terminate the polygon and an attributes dialog will appear. Click 'OK' with no attribute information input.
  7. Turn off editing to save the edits.



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