Geoscience Reference
In-Depth Information
Fig. 4.35 Function f
2
in (
4.56
)
A physical model of functional correlation between elements of low-frequency
oscillations and wind-generated waves was developed by Krylov (2001):
; s
lf
¼
bs;
h
2
g
H
g
h
lf
¼
a
2
W
ð
4
:
57
Þ
s
s
2
where
ʨ
is an empirical function which satis
es the following conditions:
ʨ
→
1
2
)
16 s
1
when H/(g
˄
→
∞
and
˄
= 6.2 s for
˄
lf
= 62 s and
ʲ
=10
°
then
W
¼ 0
:
if
ʱ
ned for every basin. As example, Table
4.16
gives
the estimates of parameters from (
4.57
) for South-China Sea.
The physical effect of sea oscillation on the ship is shown in the form of its
transverse-horizontal rocking with oscillation amplitude of the ship mass center:
= 11.5. Characteristic
ʨ
is de
A
g
¼ k
g
a ¼ 0
:
5hk
g
ch½2
p
ð
H
z
Þ=k =
sh
½2
p
H
=k;
where a is the amplitude of transverse-horizontal oscillations of water particles on
the level of the ship mass centre; H is the sea depth; z is the elevation of the ship
Table 4.16 Elements of wind-generated waves and low-frequency oscillations for Vietnamese
coastal waters of South-China Sea
Aquatory
h (m)
h
lf
(m)
˄
(s)
˄
lf
(s)
F
ʱ
ʲ
Tam Zhang
1.89
0.12
5.9
61
0.44
11.3
9.9
Nai
1.71
0.15
5.2
63
0.65
12.1
11.0
Cam Ranh Bay
1.44
0.13
4.6
62
0.76
11.4
13.0
Van Phong Port
1.87
0.14
5.1
60
0.64
12.3
12.0
Thi Nai Port
1.66
0.12
4.7
65
0.75
11.5
14.0
Nuoc Ngot Lagoon
1.57
0.13
4.8
66
0.73
11.2
13.8
Notation F
¼
2
p
Hg
1
s
2
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