Tutorial Module04 Archive: Difference between revisions
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==2D Breaklines==
As mentioned above, the water level from the 1D is transferred out to the 2D HX cells. Therefore, it is important that the 2D cell elevation reflects the level when water can spill out into the 2D. The water level computation point for the 2D cells is the cell centre, therefore it is important to use a "thick" breakline. The types of breaklines was discussed further when reviewing the check files for the previous module <u>[[
In the image below, the lightly shaded cells are the 1D/2D boundary cells. The black labels are the elevations with no breakline (elevation as read from the DEM). At the circled cell, the cell centre elevation is 44.35, this controls when water can spill from the 1D to the 2D. The red line indicates the true top of bank; the labels are elevations along this line. If this is included as a breakline, the elevations are as labelled in yellow. In this case, the level at the circled cell is actually 44.57. Including breaklines for the top of bank is important, particularly if there is an embankment or levee.
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