ElizaCollison: Created page with "=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...."

2023-01-08T23:13:42Z

Created page with "=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...."

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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=
<ol>
<li>Open the '''1d_bc_empty_P.shp''' template file from the '''TUFLOW\model\gis\empty''' folder. Save this template file as '''1d_bc_M04_001_P.shp''' in the '''TUFLOW\model\gis''' folder.</li>
<li>Check the 'add saved file to map' box when saving the new layer or alternatively load the new layer to the current view. Toggle editing for the new layer. The template file may now be closed.</li>
<li>We are going to snap three point features to the '''1d_nwk_M04_channels_001_P''' layer, providing the necessary upstream and downstream boundaries to the creek channel. With snapping enabled in QGIS, use the Add Feature tool to digitise a point feature snapped to the upstream extent of the 1d_nwk_M04_channels_001_P layer (the south western area of the model area).</li>
<li>In the attributes window that is displayed, enter the point ''Type'' as '''QT''' and the ''Name'' as '''FC01'''. Make all other attributes blank by removing any null entries. The name FC01 links the boundary condition specified in the bc_database to this location in the model.</li>
 
[[File:Tute M04 QGIS 1d bc 01.png|600px]]
 
<li>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.</li>
<li>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'''.
 
[[File:Tute M04 QGIS 1d bc 02.png|600px]]
 
<li>Save edits to the '''1d_bc_M04_001_P''' layer to finish.
</ol>

=Conclusion=
The 1d_bc layer is now ready for input into TUFLOW. Please return to the Module 4 main page [[Tutorial_Module04_Archive#Modify_Simulation_Control_Files | here]] where the next step is to create modified TUFLOW simulation control files prior to running the model.

Tute M04 QGIS 1d bc Archive - Revision history

ElizaCollison: Created page with "=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...."