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Costal Inlets Research Program
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Figure 50. Experiment setup for harbor dredging planform configuration
Figure 52. Flow leaving dredged region over vertical transition
TR-03-6
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Figure
51.
Dredge
transition
planform
configurations
Dredge
Transition
Test
Results
Flow
leaving
dredged
area
The
first
case
tested
was
flow
leaving
the
deeper
dredged
area
and
passing
over
the
transition.
Measured
velocity
vectors in the dredged
area
adjacent to the
dredge
transition
are
shown in
Figure
52
for
the
vertical
transition
and
Figure
53
for
the
sloping
transition.
For
the
vertical
dredge
transition,
the
vertical
distance
was
highest
at the
lower
right
side
of
Figure
52,
and
here
the
middepth
velocity
vectors
aligned
with
the
transition
and
increased
slightly
in
magnitude
.
This
vector
realignment
lessened
as the
height
of the
vertical
step
decreased.
However,
the
effect
of the
vertical
transition
was
mainly
in
redirecting
the
flow;
velocity
magnitudes
were
not
appreciably
decreased,
and
this
lowered
the
suspended
sediment
deposition
potential.
The
flow
pattern
was
only
slightly
different
in the
case
of a
sloping
transition
as shown by the vectors in
Figure
53.
The
vectors were more
uniform
at
mid-
depth
because
of a smoother
transition
to the
shallower
region,
and
deposition
potential
was
even
less
than
for
the
vertical
transition.
Flow
entering
dredged
area
The
dredge
transition
pieces
were
reversed
in the
flow
table
to
simulate
tidal
flow
entering
the dredged
area.
Measured
velocity
vectors in the
area
to the
lee
of the dredge
transition
are
shown in
Figure
54
for
the
vertical
transition
and
Figure
55
for
the
sloping
transition.
As
water
flows
over
the
vertical
transition,
flow
separation
occurs
at the
step
which
creates
a
region
of
turbulence
in the
immediate
lee
of the
step.
This
is
weakly
illustrated
by
Figure
54,
where
flow
is
from
the
bottom
to
top
in the
figure.
Dye
injection
upstream
of the
vertical
transition
revealed
a
helical
flow
69
Chapter
6
Impact
of
Dredging
Planform
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