1D-2D Flood Modeller-TUFLOW: Difference between revisions

 

=Introduction=

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Depending on the water level in the surrounding 2D cells, flow can either enter or leave the HX cells. The volume of water entering or leaving the 2D boundary is added or subtracted from the 1D Flood Modeller model to preserve volume. We must connect the HX lines to the 1D Flood Modeller model. This is done using CN type lines in the 2d_bc layer, where a CN line is connected to the HX line, the water level from the 1D Flood Modeller nodes is transferred to the HX line. In between 1D nodes, a linear interpolation of water level is applied. This is shown in the figure below.

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=Building a Flood Modeller-TUFLOW 1D-2D SX Connection=

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The image below shows the representation within Flood Modeller and TUFLOW of a simple flume model. As you can see in Flood Modeller, the end open channel section '''FMT_003''' links directly to a spill unit, housing the same cross-section data, which then links to a dummy HT boundary unit. This dummy unit is left empty and works as a link between Flood Modeller and TUFLOW. Taking the Flood Modeller schematisation across to TUFLOW, as we saw in the section above the open channel section is linked via a 1D node and 2d_bc CN/HX connection. The SX link comes into play by having another 1D node (which for clarity it is recommend having in a separate file to the Flood Modeller Nodes) which has the same ID as the dummy HT boundary, remember that Flood Modeller is case sensitive so name exactly as is in Flood Modeller. As the connection between the open channel section '''FMT_003''' and the dummy boundary happens in Flood Modeller, no literal link is needed between these in the TUFLOW GIS files. All that is needed otherwise is a 2d_bc file with a CN/SX link snapped to the dummy boundary node, this again can be in a separate file to the CN/HX links for clarity or can be in the same file.