************** EXAMPLE PROBLEM **************
GIVEN: Consider a hurricane at latitude 35°N. with R = 36 nautical miles,
Zp~= 29.92 - 27.61 = 2.31 inches of mercury, and Vp, forward speed, =
26 knots. Assume for simplicity that a = 1.0.
FIND; The deepwater significant wave height and period.
SOLUTION:
Using Equation 3-35
Umax = °-868 [73(P ”P )* - R(0.575£)j
umax = °-868 [73 (2.31)^ - 36 (0.575 X 0.300)
umax “ °*868 (110-95 - 6.23) = 90.9 knots.
Using Equation 3-34
UR = 0.865 Umax + 0.5Vf
Ur = 0.865 (90.9) + 0.5 (26) = 91.6 knots.
Using Equation 3-31
RAp
Ho = 16.5 e100
0.208 aVr; r
where the exponent
RAp = 36 (2.31)
100
100
and
e°.832 = 2 3Q
then
Ho = 16.5 e0-’“ , , 0.208 X 1 X 26
1 T------------- —
_____
Ho = 16.5 (2.30) (1.564) = 59.4 feet.
3-60