Tutorial M04 GIS Inputs QGIS

Introduction

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

TUFLOW Project Re-Configuration

Re-configure the TUFLOW project to use and save empty files to the correct folder:

1. Go to Plugins > TUFLOW > Editing > Configure / Create TUFLOW Project.
2. Change the folder which contains TUFLOW to the Module_04 folder. This is the only change required, the model folder structure and template empty files are supplied from previous model.
   Note: The 'results' and 'check' folder get automatically created when the TUFLOW model is run.
   
3. Click 'OK' and save the QGIS workspace by selecting Project > Save As.
   
   
   
   
4. Set the QGIS workspace projection to EPSG:32760, see Set the Projection.

Method

Navigate to the Module_04\Tutorial_Data folder. Copy and save all the below layers into the Module_04\TUFLOW\model\gis folder:

• 2d_lfcsh_M04_bridge_001_L
• 2d_po_M04_001_L
• 2d_po_M04_001_P
• 2d_zsh_M02_cut_002_R

Investigate the supplied files:

1. Open the files, either:
   

   • Drag and drop the .shp files into the QGIS workspace, or
   • Select Layer > Add layer > Add Vector Layer and navigate to the Module_04\TUFLOW\model\gis folder.

2. The 2d_zsh file cuts through the road embankment, see Module 2 for more information.
   
3. The 2d_lfcsh represents the bridge in 2D, it has layers of varying blockage and form loss for piers, bridge deck and railings. The layers of the bridge structure are defined as:
   
   
   

   • Layer 1: Beneath the bridge deck.
   • Layer 2: The bridge deck.
   • Layer 3: The bridge rails.
   • Layer 4: Flow above the rails (assumed to be unimpeded).

   See Table 6-21 of the 2018 TUFLOW Manual for more information on the attributes.
   
   
   
   

4. The 2d_po files include a structure group output for the 2D bridge. The 'Label' attribute links the 2d_po line to the 2d_po points by the same attribute ‘Bridge’.
5. The 2d_po line is snapped to the 2d_lfcsh from left to right looking downstream and has the following attributes:
   

   • Type = QS (structure flow)
   • Label = Bridge

6. The 2d_po points are digitised upstream and downstream of the 2d_lfcsh and have the following attributes:
   

   • Type = HU (water level upstream) and HD (water level downstream)
   • Label = Bridge

   
   
   

Conclusion

• The 2d_lfcsh layer was supplied for use as a 2D bridge.
• The 2d_po structure group layers were added to output additional hydraulic information of the 2D bridge.

Up
Back to Module 4 Main Page