Tute M04 MI 1d bc Archive
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Introduction
In this section we will create the 1D boundary conditions layer using a TUFLOW 1d_bc file. It is in this layer that we will specify the 1D boundary conditions.
Method
- Import the 1d_bc_empty.mif template file from the TUFLOW\model\mi\empty folder and save as 1d_bc_M04_001 in the TUFLOW\model\mi folder.
- Add the layer to the current view and make it editable. We are going to snap three point features to the 1d_nwk_M04_channels_001 layer, providing the necessary upstream and downstream boundaries to the creek channel. With the 1d_bc_M04_001 layer editable and snapping enabled in MapInfo, digitise a point feature snapped to the upstream extent of the 1d_nwk_M04_channels_001 layer (the south western area of the model area). Using the Info Tool specify the boundary type as QT and Name as FC01. The name FC01 links the boundary condition specified in the bc_database to this location in the model.
- Repeat this process and digitise a point feature snapped to the upstream extent of the secondary channel FC02. Again specify the boundary Type as QT and this time the Name as FC02. This name will link channel FC02 to the unique inflow boundary in the bc_database.
- To complete the process we need to specify the boundary condition to be connected to the downstream extent of the model located to the north. Digitise a point feature snapped to the downstream extent of the 1D channel at ds_weir. The downstream boundary is an water level versus flow boundary that assigns a water level at the downstream boundary according to the flow entering the node. Specify the Type as HQ and the Name as DS_BC.
- It's recommended that you apply differing styles to upstream and downstream boundaries so that they may be easily distinguished by the user. For this tutorial we have used green triangles for inflows and a yellow circle for downstream boundaries.
- Save the 1d_bc_M04_001 file and export to .mif format for import into TUFLOW.
Conclusion
The 1d_bc layer is now ready for input into TUFLOW. Please return to the Module 4 main page here where the next step is to create modified TUFLOW simulation control files prior to running the model.