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Costal Inlets Research Program
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> Fig. 5. Offshore wave trains measured approximately 14 m from SWS.
Fig. 4. Surface elevations following the passage of two large passenger carrying vessels and the associated energy spectrums.
Measured run-up and swash depth
Swash_Erikson-etal
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L.
Erikson
et
al.
/
Coastal
Engineering
52 (2005)
285302
293
Table 1
seen
or extracted
when
specified
energy
components
Summary
of experimental conditions
are
filtered
out.
The
power
spectrums
of
each
are
Case
T
f
m
H
0
/L
0
Foreshore
Surf
similarity,
H
0
shown
in the
lower
plots
of the
figure
and
indicate
slope
(tan
b)
n
(s)
(Hz)
(m)
that
for
the
first
wave
train,
the
majority
of the
C1
1.7
0.06
0.18
0.040
0.20
0.130.80
energy
is concentrated
around
0.13
Hz.
For
the
B8
1.3
0.08
0.13
0.049
0.07
0.170.99
second
wave
train,
most of the
energy
is
concen-
B9
1.3
0.08
0.18
0.068
0.07
0.111.08
trated
around
0.15
Hz
but
there is also
significant
B10
2.2
0.05
0.13
0.017
0.07
0.301.63
energy
in the
lower
and
greater
frequencies
up to
about
0.25
Hz.
Based
on
similar
analyses
of
several
wave
trains
and
a
comprehensive
literature
review
it
seems
that the
majority
of
significant
energy
for
Fig.
4
(
Johansson,
2000
).
The
first
wave
packet
from
typical
vessel generated
wave
trains
lies
below
0.25
about
50 to
300
s was generated by a
high-speed
Hz
(i.e.,
greater
than
4
s).
vessel
while
the surface
elevations
from
about
650
s
The
idealized
wave
packets
employed
in the
onward
are
from
a
conventional
displacement vessel.
experiment
consisted
of
wave
trains
with
increasing
The
initial
decline
of the
water
surface
(from
700
s
and
subsequently
decreasing
wave
heights
and
to
750
s) is
due
to the displacement of the
ship
and
individual
wave
periods
from
4.1
s to 7 s.
The
is
not
considered
in this
study.
Note
however
that the
upper
limit
was
set
to
avoid
spurious
wave
gen-
shorter
waves
of
both
wave
trains
are
quite
similar
in
eration
in the
small
wave
tank. A time-scale
factor
of
that
they
increase
in
height
and
subsequently
1:3.16
(corresponding
to a
length-scale
factor
of
decrease.
This
is
quite
typical
and
can
be
readily
0.15
0.15
0.1
0.1
C1
B8
0.05
0.05
0
0
-0.05
-0.05
-0.1
-0.1
125
130
135
140
145
150
675
680
685
690
695
700
Time
(s)
Time
(s)
0.15
0.15
B10
0.1
0.1
B9
0.05
0.05
0
0
-0.05
-0.05
-0.1
-0.1
675
680
685
690
695
700
700
705
710
715
720
725
Time
(s)
Time
(s)
Fig.
5.
Offshore
wave
trains
measured
approximately 14 m
from
SWS.
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