B&G Deckman - Manual (Page 144)

Making wind or current Grids
9.17
Current
The same principles apply to creating current models. One further
technique will be outlined here. The aim is to create a strong current
stream, reducing very quickly to little flow in nearby areas, for example
in the Gulf Stream. To do this, first draw a line of nodes representing the
strong current. Next, enter 0 in the Speed box, and then draw lines close
to each side of the strong current in the positions where you expect the
current to have reduced to 0 (here it is important again to consider the
triangulation – make sure the nodes are close enough together within the
rows of the same value). Figure 9.12 shows detail about the construction
of this current, while Figure 9.13 shows the overall outcome. Note that
the Grid Res box is set at 0.3 (degrees) in Figure 9.13 and therefore less
detail can be seen than in Figure 9.12.
Figure 9.12