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2
P
(Pa)
0
-2
0
1
2
T
(s)
3
4
Figure 3.1 Hydrophone time series bandpass-filtered in the range 500 Hz to 10 kHz. Vertical scale
is pressure in Pa, horizontal scale is time in sec. Figure is reproduced from
Melville
et al.
(
1992
)by
permission of Ken Melville
Figure 3.2 Video image of the breaker that occurred near
t
=
1 s of the one-minute record shown in
Figures 3.4
a,c and
3.5
. Figure is reproduced from
Babanin
et al.
(
2001
) by permission of American
Geophysical Union
noise in the field which make the determination of both duration and energy of the breaking
acoustic impact unfeasible (see also
Babanin
et al.
,
2007b
and
Section 8.3
).
To demonstrate this, in
Figures 3.2
,
3.3
and
3.4
breakers, detected by repeated viewing of
video records, and synchronised wave records are shown. The data were collected during
the Lake George field experiment (
Babanin
et al.
,
2001
;
Young
et al.
,
2005
). The first and
last breakers of a one-minute segment of record 4 of
Table 5.2
(i.e. those occurring in
t
55 s) are shown in the captured video images seen in
Figures 3.2
and
3.3
,
respectively. It is clear that these are cases where the crest of a breaking wave is passing
through the wave array and over the bottom-mounted hydrophone underneath the array.
=
1 s and
t
=
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