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Costal Inlets Research Program
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> Figure 57. Photograph of flow entering dredged region over sloping transition
Figure 56. Photograph of flow entering dredged region over vertical transition
7 3-D Cook Inlet Model
TR-03-6
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Figure
57.
Photograph
of
flow
entering
dredged
region
over
sloping
transition
Conclusions
from
Dredge
Transition
Experiments
Tidal
flow
leaving
the
harbor
across
a
vertical
transition
is
redirected
seaward
closer
to
shore
where the
transition
step
is
highest.
The
redirected
velocity
increased
somewhat
(up
to 13
cm/sec
5.1
in./sec)), and
this
might
even
promote
a
scouring
effect
near
the
vertical
cut.
Flow
leaving
the
harbor
over
a
sloping
transition
remained
straight
and
mostly
uniform
with
magnitudes
on the
order
of 11
cm/sec
(4.3
in./sec).
Neither
transition
should
cause
an
increase
of
suspended
sediment
deposition
potential
because
flow
velocities
remain
reasonably
high
over
the
transition.
Tidal
flow
entering
the
harbor
across
a vertical
transition
creates
a
turbulent
wake
region
that
has
suspended
sediment
deposition
potential
in
the
immediate
area
downstream
of
the
step.
In
addition,
fluid
is
advected
laterally
along
the
vertical
cut
which
would
move
sediment
shoreward
toward
the
mooring
area.
Replacing
the
vertical
transition
with
a
sloping
transition
significantly
reduced
the
turbulent
wake
resulting
in
smoother
flow
patterns
and
less
likelihood
of
sediment
deposition.
73
Chapter
6
Impact
of
Dredging
Planform
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