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Passive boundary conditions

First an example. Notice the diagonal channels marked with u and v  as well as the twelve types of land
boundaries represented by neat MS-DOS line-drawing characters.

From left to right:
 Inland (the stippled symbol)   u=v=0, zeta=0      0 
 East-coast  u+v=0, values to the east    10 
 North-coast  u-v=0, values to the north    20
 West-coast  u+v=0, ...   30
 South-coast  u-v=0, ...   40
 NE-cape (sea to the NE)  v=0, values to the NE   50
 NW-cape  u=0, values to the NW   60
 SW-cape  v=0, ...   70
 SE-cape  u=0, ...   80
 SE-bay (sea to the SE)  u=v=0   90
 NE-bay  u=v=0  100 
 NW-bay  u=v=0  110
 SW-bay  u=v=0  120
 u  - sea connected (narrow passage open for SE-currents)   v=0  130
 v  - sea connected  (narrow passage open for NE-currents)   u=0  140
 / - land connected SW-NE  (two bays (NW and SE) 
 u=v=0  150
 \ - land connected NW-SE  (two bays (SW and NE) 
 u=v=0  160
The second column indicates the conditions for forming the special types of equations for
the currents. The third column shows the state number (0) or the boundary condition number
(greater or equal 10)

There are flags carrying other meanings.

Click here for hints how to view/print these arrays.
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