EM 1110-2-1100 (Part II)
(Change 1) 31 July 2003
Dimensionless wave height (Equation II-2-22)
hm
Height of the land barrier [length]
Hm0
Energy-based significant wave height [length]
Hstable
Stable wave height (Equation II-4-14) [length]
H4
Fully developed wave height (Equation II-2-30) [length]
k
Dimensionless von Krmn's constant (approximately equal to 0.4). Also, k =
2π
wave number [length-1] defined as =
where L = wave length [length]
L
L
Parameter that represents the relative strength of thermal stratification effects
[length]
Dimensionless empirical exponents used in empirical wave predictions
m1-5
-O
The subscript 0 denotes deepwater conditions
Pressure at radius r of a storm [force/length2]
p
Central pressure in the storm [force/length2]
pc
Ambient pressure at the periphery of the storm [force/length2]
pn
r
Arbitrary radius [length]
rc
Radius of curvature of the isobars [length]
RL
Ratio of over water windspeed, UW to over land windspeed, UL as a function of over
land windspeed (Figure II-2-7)
Distance from the center of the storm circulation to the location of maximum wind
Rmax
speed (Equation II-2-20) [length]
Rossby radius of deformation (Equation II-2-1) [length]
RO
RT
Amplification ratio (Figure II-2-8), ratio of wind speed accounting for effects of air-
sea temperature difference to wind speed over water without temperature effects
t
Duration [time]
Air temperature [deg C]
Ta
Tp
Limiting wave period (Equation II-2-39) [time]
Ts
Water temperature [deg C]
tx,u
Time required for waves crossing a fetch (Equation II-2-35) [time]
u
Wind speed [length/time]
U't
Estimated wind speed of any duration [length/time]
Uc
Cyclostrophic approximation to the wind speed [length/time]
II-2-70
Meteorology and Wave Climate
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