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The two-dimensional grid of equilateral triangles is created with the m-file twodgrid.m, which can be downloaded from .

As shown in Figure 11, it is 3 km long by 1 km wide with a total of 1215 equilateral triangles with edge lengths of 75 m. The eastern and southern boundaries are marked as type 2 edges. These will be specified in boundaries.c. The depth is 10 m and is specified in initialization.c as

return 10;
There are 10 vertical levels (suntans.dat: Nkmax = 10).
Figure 11: Two-dimensional planview of the river plume grid, showing the boundary edges of type 2 in bold.