EM 1110-2-1100 (Part II)
30 Apr 02
Figure II-1-38. Comparison of the PM and JONSWAP spectra (Chakrabarti
1987)
4
2
m
f E 2(f) df
Qp '
(II-1-151)
2
m0
0
which depends only on the first moment of the energy density spectrum, and is not directly related to ε. In
general, a small ε implies that Qp is large, and a large ε means Qp is small.
(d) Approximate relations for most common wave parameters by the statistical analysis are
HS ' 4.0 m0
;
H1/10 ' 5.1 m0
m0
m2
Tz '
;
Tc '
m2
m4
(II-1-152)
2
m2
η ' m0
;
ε'
1&
m0m4
Water Wave Mechanics
II-1-87
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