EM 1110-2-1100 (Part II)
(Change 1) 31 July 2003
∆T = +3EC
75
5 m/sec
10 m/sec
60
15 m/sec
20 m/sec
45
25 m/sec
30 m/sec
"1/7" Rule
30
15
0
0.9
1
1.1
1.2
1.3
U/U10
∆T = 0 EC
75
5 m/sec
10 m/sec
60
15 m/sec
20 m/sec
45
25 m/sec
30 m/sec
"1/7" Rule
30
15
0
0.9
1
1.1
1.2
1.3
U/U10
∆T = -3EC
75
60
45
5 m/sec
10 m/sec
30
15 m/sec
20 m/sec
15
25 m/sec
30 m/sec
"1/7" Rule
0
0.9
1
1.1
1.2
1.3
U/U10
Figure II-2-6. Ratio of wind speed at any height to the wind speed at the 10-m height
as a function of measurement height for selected values of air-sea temperature
difference and wind speed: a) ∆T=+3EC; b) ∆T=0EC; c) ∆T=-3EC. Plots generated with
following conditions: duration of observed and final wind = 3 hrs; latitude = 30E N;
fetch = 42 km; wind observation type - over water; fetch conditions - deep open water
II-2-12
Meteorology and Wave Climate
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