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FM Tute M01 MI 1D2D Links: Difference between revisions

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=Introduction=
In this section we will apply a water level boundary to the 2D cells along the 1D/2D interface. In the 2D boundary condition (2d_bc) GIS layer, we define the location at which this link occurs. The 2D water level applied at the 2D boundary cells is calculated in the 1D Flood Modeller component. The terminology used in TUFLOW is a "HX" type boundary on the 2D cells, with the H indicating that a Head (water level) boundary is used and the X indicating the value is coming from an eXternal model (in this case Flood Modeller).
In this section we will create the 1D/2D links to link the Flood Modeller 1D component to the TUFLOW 2D domain.<br>
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.
As described on the previous page, this consists of a boundary line with type "HX" and a series of connection lines that connect the 1D computation points to the HX line. <br>
The HS line is how flow is transfered between the 2D TUFLOW domain and the 1D Flood Modeller Domain.<br>
For this tutorial the HX lines and a sample of the "CN" lines have been provided.
<br>
The empty GIS files used in this tutorial are the same as those created in [http://wiki.tuflow.com/index.php?title=Tutorial_Module01#Set_GIS_Projection_and_Create_Empty_.28Template.29_Files step 4 of tutorial module 1].<br>
These template files set up how to enter the GIS data for TUFLOW to read.
 
=Method=
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<li>Interrogate one of the lines running along the banks of the watercourse. These lines are the 1D/2D boundary links and have been assigned a type ‘HX’.</li>
<li>Interrogate one of the lines connecting the x1D node to the HX line. These are the connection or ‘CN’ lines that read the water level from Flood Modeller and transfers this to the HX line. </li>
In the figure below, the water level is calculated in Flood Modeller at the nodes FC01.16, FC01.15 and FC01.14. These water levels are linearly interpolated along the lengths of the HX line on botheach of the left and right banks of the watercourse. When the water level exceeds the ZC elevation of the boundary cell, water is able to flow onout theonto the TUFLOW 2D floodplain. <br>
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[[File:FMT 1D-2D Linking.JPG|600px]]
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