Flood Modeller Tutorial Module01 Provisional: Difference between revisions
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The 2D domain represents the floodplain, while the 1D model represents the watercourse and in-channel structures. Linked 1D–2D models combine the strengths of both approaches. Here, the 1D scheme represents the largely unidirectional flow of the watercourse, while the 2D scheme captures the more complex floodplain hydraulics.
In the below 2D model example, the main channel is only
[[file:Poor_2d_rep.png|400px]]<br>There are several options for improving the representation of
* Decrease the width of the 2D cells, either globally or by using Quadtree, and/or apply sub-grid sampling.
* Model the channel as a 1D network dynamically linked to the 2D domain (the floodplain).
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<li>We need to read in the GIS layers of the Flood Modeller Nodes. Place the below command line anywhere in the .tcf. It is good practice to create a section within the .tcf to reference all 1D commands:<br><u>'''QGIS - SHP'''</u><br><font color="blue"><tt>Read GIS X1D Nodes</tt></font> <font color="red"><tt>== </tt></font>..\model\gis\1d_x1d_FMT_M01_nodes_001_P.shp <font color="green"><tt>! GIS layer referencing node IDs from Flood Modeller </tt></font><br><u>'''QGIS - GPKG'''</u><br><font color="blue"><tt>Read GIS X1D Nodes</tt></font> <font color="red"><tt>== </tt></font> 1d_x1d_FMT_M01_nodes_001_P <font color="green"><tt>! GIS layer referencing node IDs from Flood Modeller</tt></font>
<li>Add commands to read in the GIS layers referencing Water Level Lines drawn along the Flood Modeller component of the model:<br><u>'''QGIS - SHP'''</u><br><font color="blue"><tt>Read GIS X1D Network</tt></font> <font color="red"><tt>== </tt></font>..\model\gis\1d_x1d_FMT_M01_nwk_001_L.shp <font color="green"><tt>! GIS layer representing channels to allow for the digitisation of Water Level Lines (optional)</tt></font><br><font color="blue"><tt>Read GIS X1D WLL</tt></font> <font color="red"><tt>== </tt></font> ..\model\gis\1d_x1d_WLL_FMT_M01_001_L.shp <font color="green"><tt>! GIS layer containing WLLs for visualising 1D results in 2D (optional)</tt></font><br><u>'''QGIS - GPKG'''</u><br><font color="blue"><tt>Read GIS X1D Network</tt></font> <font color="red"><tt>== </tt></font> 1d_x1d_FMT_M01_nwk_001_L <font color="green"><tt>! GIS layer representing channels to allow for the digitisation of Water Level Lines (optional)</tt></font><br><font color="blue"><tt>Read GIS X1D WLL</tt></font> <font color="red"><tt>== </tt></font> 1d_x1d_WLL_FMT_M01_001_L <font color="green"><tt>! GIS layer containing WLLs for visualising 1D results in 2D (optional)</tt></font><br>The addition of TUFLOW Water Level Lines (WLL) allows the Flood Modeller 1D results to be visualised within the TUFLOW 2D map outputs. They provide a means by which to remove the gaps in the map outputs where the 1D Flood Modeller domains are located and the 2D cells are deactivated. To do this, TUFLOW requires a 1D_WLL layer to define the cross sections locations, and a 1d_nwk layer that defines the river centre line. The layers are not used in the hydraulic calculations and their inclusion is not always required. The Dist_for_Add_Points determines the intervals in metres at which interpolation points are inserted along each WLL.
<li>Add commands to read in an ESTRY Control File which contains references to some of the culverts present on the floodplain:<br><font color="blue"><tt>ESTRY Control File</tt></font> <font color="red"><tt>== </tt></font>..\model\FMT_M01_001.ecf <font color="green"><tt>!Reference the ESTRY Control File </tt></font>
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= Review the Results =
Instructions for viewing the TUFLOW mesh (XMDF) and 1D time series (.tpc) outputs are provided in [[Tutorial_M01_Results_QGIS | Module 1]] and [[Tutorial_M03_Results_QGIS | Module 3.]] It is often useful to view 1D Flood Modeller results alongside 2D TUFLOW map outputs. The Flood Modeller results can be opened in QGIS with the TUFLOW Viewer plugin, together with the TUFLOW mesh results, by following the linked instructions. Alternatively, the TUFLOW mesh results can be loaded directly into the Flood Modeller Pro interface.
The video below demonstrates both methods:
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