TUFLOW CATCH Tutorial M02 Draft

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Introduction

In this module, a TUFLOW CATCH hydrology model is developed.

TUFLOW CATCH Tutorial Module 2 is built from the model created in TUFLOW CATCH Module 1. The completed TUFLOW CATCH Module 01 is provided in the TUFLOW_CATCH_Module_02\Modelling folder of the download dataset as the starting point for this tutorial. If you are not already familiar with TUFLOW CATCH, we recommend completing TUFLOW CATCH Module 1 prior to starting this tutorial.

GIS Inputs

Create, import and view input data:

• QGIS GIS Inputs - TUFLOW HPC
• QGIS GIS Inputs - TUFLOW FV

Simulation Control Files

The following steps will require use of a text editor. The tutorial demonstration uses Notepad++. For its configuration information refer to Notepad++ Tips.

TUFLOW Boundary Control File (TBC)

1. Save a copy of TC01_001.tbc as TC02_001.tbc in the TUFLOW_CATCH_Module_02\Modelling\TUFLOW\model folder.
2. Open the TC02_001.tbc in a text editor and update the reference to the 1D/2D culvert connections:
   Read GIS BC == gis\2d_bc_TC02_001_P.shp ! Links the two upstream 1D culverts to the 2D domain
   Read GIS BC == gis\2d_bc_TC02_001_L.shp ! Links the two upstream 1D culverts to the 2D domain
   
3. Save the TBC.

TUFLOW ESTRY Control File (ECF)

1. Save a copy of TC01_001.ecf as TC02_001.ecf in the TUFLOW_CATCH_Module_02\Modelling\TUFLOW\model folder.
2. Open the TC02_001.ecf in a text editor and update the following line to reference the new 1d_nwk layer (containing the two upstream culverts):
   Read GIS Network == gis\1d_nwk_TC02_001_L.shp ! Defines the two upstream culverts
3. Save the ECF.

TUFLOW CATCH Control File (TCC)

Global Settings

For this tutorial, leave all commands as is. This section of the .tcc was populated in TUFLOW CATCH Tutorial 1.

Catchment Hydraulic Model

This block contains commands that construct the TUFLOW HPC simulation.

1. Save a copy of TC01_001.tcc as TC02_001.tcc in the TUFLOW_CATCH_Module_01\Modelling\TUFLOWCatch\runs folder.
2. Open TC02_001.tcc in a text editor, and update the following commands to reference the new TBC and ECF:
   BC Control File == ..\..\TUFLOW\model\TC02_001.tbc ! Reference the TUFLOW Boundary Conditions Control File
   ESTRY Control File == ..\..\TUFLOW\model\TC02_001.ecf ! Reference the ESTRY (1D) Control File
   
3. Remove or comment out the following command using a '!' symbol. The receiving polygon can only be used in the pollutant export configuration of TUFLOW CATCH.
   ! Receiving Polygon == ..\..\TUFLOW\model\gis\2d_rp_TC01_001_R.shp ! GIS layer defining the receiving polygon
   

Pollutant Export Model

This block contains commands that control the pollutant export (and other constituent) simulation. As this tutorial model is a hydrology simulation, we must set the pollutant export model to none, and comment out all commands. The pollutant export model block should look similar to the below:

Catchment Pollutant Export Model == None

! Constant Salinity == 0.0

! Constant WQ_DISS_OXYGEN_MG_L == 8.0

! Time-Series Temperature == Temperature

! Material == ALL ! Default parameters for all materials

 ! SED_CLAY, Method == Shear1, Rate == 0.0, Limit == 100.0, Depth Threshold == 0.02, Deposition Stress == 0.1, Erosion Stress == 0.5, Deposition Velocity == 0.1, Erosion Rate == 0.05

 ! WQ_PATH_ECOLI_ALIVE_CFU_100ML, Method == Washoff1, Rate == 0.0, Limit == 0.0, Time Constant == 3600.00, Rain Threshold == 1.0, Depth Threshold == 0.20, Deposition Velocity == 0.0

 ! WQ_PATH_ECOLI_DEAD_CFU_100ML, Method == Washoff1, Rate == 0.0, Limit == 0.0, Time Constant == 3600.00, Rain Threshold == 1.0, Depth Threshold == 0.20, Deposition Velocity == 0.0

! End Material

! Other material specifications ...

! Other material specifications ...

End Catchment Pollutant Export Model

Receiving Model

This block contains commands that construct the TUFLOW FV simulation. These commands are almost entirely those that would be used in setting up a standalone TUFLOW FV control file (.fvc), with a small number of additional commands that relate to TUFLOW CATCH.

1. Set the receiving model:
   Receiving Model == TUFLOWFV
2. do we need to have this command - how to fix the issue that's causing the warning?
   Global Temporal Extrapolation Check == WARNING
   
3. In the 'Timestep Commands' section, update the following commands:
   CFL == 0.95  ! Specify the Courant–Friedrichs–Lewy (CFL) number
   Timestep Limits == 0.10,1.0  ! Specify the minimum and maximum timesteps (seconds)
   Display dt == 30  ! Interval of displaying timestep information to the log (seconds)
   
4. In the 'Model Parameters' section, update the following commands. All other commands in this section relate to 3D modelling, so they can be removed or ignored is this true?.
   Stability Limits == 100.0, 10.0  ! Specify maximum water level (meters) and velocity (m/s) which indicate an unstable model
   Momentum Mixing Model == Smagorinsky  ! Specify the momentum mixing model
   Global Horizontal Eddy Viscosity == 0.2  ! Specify the Smagorinsky coefficient
   Global Horizontal Eddy Viscosity Limits == 0.05, 99999.  ! Globally sets the minimum and maximum horizontal eddy viscosity limits
   Scalar Mixing Model == Smagorinsky  ! Specify the scalar mixing model
   Global Horizontal Scalar Diffusivity == 0.2  ! Specify the Smagorinsky coefficient
   Global Horizontal Scalar Diffusivity Limits == 0.05, 99999.  ! Globally sets the minimum and maximum horizontal scalar diffusivity limits
   
5. At the end of the 'Model Parameters' section, add the following command to set the cell wetting and drying depths:
   Cell Wet/Dry Depths == 5.0e-03, 5.0e-02  ! Specify the cell wetting and drying depths (meters)
   

Troubleshooting

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

• QGIS

Check Files and Results Output

Complete the steps outlined in the following links to review check files and simulation results from the TUFLOW CATCH pollutant export model simulation:

TUFLOW CATCH Tutorial 02 Check Files
TUFLOW CATCH Tutorial 02 Results