Tutorial M04

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In this module, bridges are represented within the 2D domain. Topographic changes are made to cut through the road and a time series data output created to gain information on a range of hydraulic parameters of the bridge.

The GIS layers are:

  • TGC layers:
    1. 2d_lfcsh: A layer used for modelling 2D flow under and over bridges, pipes and other obstructions across the waterway.
    2. 2d_zsh: A layer used to modify Zpt elevations using points, lines and polygons.
  • TCF layers:
    1. 2d_po: A time series data output from 2D domains, for a range of hydraulic parameters.

Module 4 builds from the model created in Module 2. The completed Module 2 model is provided in the Module_04\TUFLOW folder.

GIS Inputs

Create, import and view input data:

Simulation Control Files

TUFLOW Geometry Control File (TGC)

  1. Save a copy of M02_001.tgc as M04_001.tgc in the Module_04\TUFLOW\model folder.
  2. Open the M04_001.tgc in a text editor and add the additional lines below the Read GIS Z Shape == gis\2d_zsh_M02_rd_crest_001_L.shp | gis\2d_zsh_M02_rd_crest_001_P.shp command:
    Read GIS Z Shape == gis\2d_zsh_M02_cut_002_R.shp ! GIS layer used to define excavation through embankment
     ! 2D BRIDGES
    Read GIS Layered FC Shape == gis\2d_lfcsh_M04_bridge_001_L.shp ! Layered flow constriction representing 2D bridge losses
  3. Save the TGC.

The 2d_zsh_M02_cut_002_R.shp file from Module 2 is first read to cut through the embankment. The 2d_lfcsh is then read to represent the structure. The order is important as the 2d_lfcsh has an invert value of 99999, it uses the underlying elevation values to represent the invert of the 2D bridge. If this was read before the 2d_zsh file, it would use the elevation of the embankment crest.

TUFLOW Control File (TCF)

  1. Save a copy of M02_5m_001.tcf as M04_5m_001.tcf in the Module_04\TUFLOW\runs folder.
  2. Open the M04_5m_001.tcf in a text editor and update the reference to the TGC:
    Geometry Control File == ..\model\M04_001.tgc ! Reference the TUFLOW Geometry Control File
  3. Update both the 2d_po line and point files:
    Read GIS PO == ..\model\gis\2d_po_M04_001_L.shp ! Reads in plot output line
    Read GIS PO == ..\model\gis\2d_po_M04_001_P.shp ! Reads in plot output point
  4. Save the TCF.

Running the Simulation

  1. Save a copy of _run_M02_HPC.bat as _run_M04_HPC.bat in the Module_04\TUFLOW\runs folder.
  2. Update the batch file to reference the M04_5m_001.tcf :
    set exe="..\..\..\exe\2023-03-AA\TUFLOW_iSP_w64.exe"
    set run=start "TUFLOW" /wait %exe% -b
    %run% M04_5m_001.tcf
  3. Save the batch file and double click it in file explorer to run the simulation.


See tips on common mistakes and troubleshooting steps if the model doesn't run:

Check Files

While the model is running, review the added features are specified correctly:


When the model is finished, review the results:


  • A 2d_lfcsh was supplied and used to represent a bridge structure in the 2D domain. The invert level of this structure was implied from the underlying topography created by cutting through the road embankment.
  • 2d_po structure group was setup and described to enable more detailed result viewing through the structure.
  • Check files were used to review the 2D bridge application.
  • Results were visualised to show water passing through the 2D bridge and the structure group results were assessed.

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