246
5 Wave Evolution in Non-uniform Currents in Deep Water
of the current decreases with further increase of the wave development, i.e.
with an increasing fetch.
For sufficiently large fetches (X> 10 4 ), the ratio of heights h/ho tends to
the value (1 - il, corresponding to the ratio of wave heights for completely
developed waves at the wind speed U with and without added current velocity. This means that the influence of the fetch length distortion effect due to
i"tfto
10
7
5
~
J
2
1.0
0
0.7
::;:
O.J
0.2
0.1 J 4 5
'&2/to d)
tO
1
5
+
J
2
t.O
0.1
0.5
0.4
o.:;
0.2
0.1
Fig. 5.39 (continued). Relative values of wave period ft/fo (c) in movable coordinate system and wave period f2/fo (d) in immovable coordinate system for
different relative velocity i'