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Costal Inlets Research Program
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> Figure 4: Model (upper) and prototype (lower) scour hole contours.
Model Calibration
Figure 5: Ventura Harbor model scour downstream of rock sill.
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Figure
4:
Model
(upper)
and
prototype
(lower)
scour
hole
contours.
Scour
contours
measured
in
the
model
downstream
of
the
rock
sill
are
shown
in
the
sketch
of
Figure
5.
Contour
values
correspond
to
prototype
depths
in
meters.
The
scour
hole
attained
a
depth
greater
than
the
scour
that
occurred
in
the
second
calibration
test
as
shown
in
the
upper
sketch
of
Figure
4. Besides
being
displaced
downstream
of
the
sill,
the
scour
hole
was
narrower
and
more
elongated
than
scour
that
occurred
without
the
rock
sill
in
place.
Where
the
scour
hole
impinged
on
the
breakwater
toe,
armor
stones became
unstable
and
fell
into
the
scour
hole.
The
model
test
of
the
existing
Ventura
configuration
strongly
supported
the
hy-
pothesis
that
current-induced
scour
at
Ventura
Harbor
had
the
potential
to
undermine
the
leeside
armor
slope
along
the
entire
length
of
the
detached
breakwater
south
of
the
rock
sill.
This
would
cause
considerable
damage
to
the
leeside
armor
slope,
and
expensive
repairs
would
be
needed.
Therefore,
construction
of a
protective
toe
berm
along
the
detached
breakwater
was
warranted.
In
the
following
discussion,
all
stated
values
are
in
prototype
units.
10
Hughes/Schwichtenberg
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