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Costal Inlets Research Program
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> Coastal Evolution in Connection with Inlet Openings
Annual Net Longshore Transport
CONCLUSIONS - ICCE02_Cascade0012
ICCE02_Cascade
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Coastal
Evolution
in
Connection
with
Inlet
Openings
The
second
simulation
involved
the
period
1931-1983
during
which
Shinnecock
and
Moriches
Inlets
were
created.
Furthermore,
the
inlets
went
through
large
changes
in cross-
sectional
areas,
and
Moriches
Inlet
closed
temporarily
in 1951
before
it was
artificially
opened
again.
Fig.
5
illustrates
how
the
minimum
cross-sectional
area
varied
for
the
two
inlets
during
the
simulation
period.
The
figure
is
based
on
historic
data
(Czerniak
1977;
Morang
1999),
linearly
interpolated
to
supply
time-varying
input
values.
Equilibrium
shoal
volumes
were
derived
from
the
cross-sectional
areas
(Walton
and
Adams
1976).
It
was
assumed
that
the
shoal
and
bars
at
the
inlets
would
drive
towards
equilibrium
volumes
defined
based
on
the
instantaneous
cross-sectional
areas.
The
same
wave
time
series
served as
input
as
for
the
calculations
of
the
annual
net
longshore
sediment
transport
rate
previously
described.
The
three
WIS
Stations
provided
wave
information,
and
the
time
series
derived
for
1976-1995
was
applied
repetitively.
Fig.
6a
plots
measured
and
predicted
shoreline
positions
in 1983 as
well
as
the
initial
shoreline.
The
shoreline
measured
in 1870 was
taken
as
the
initial
shoreline,
because
no
measurements
were
available
closer
in
time
to
1931.
The
calculations
yielded
the
correct
magnitude
of advance
updrift
and
recession
downdrift
of
the
inlets,
as
well
as
the
regional
trend
of
shoreline
evolution.
Directly
downdrift
of
the
inlets,
the
predicted
shoreline
shape
deviates
somewhat
from
the
measurements,
attributed
to
incomplete
representation
of
the
influence
of
the
attachment
bar and
tidal-induced
transport
near
the
inlet.
Fig.
6b
displays
an
enlargement
of
the
shorelines
given
in
Fig.
6a in
the
vicinity
of
the
inlets.
2000
Moriches
Inlet
Shinnecock
Inlet
1600
1200
800
400
0
1930
1940
1950
1960
1970
1980
1990
2000
Time
(year)
Fig.
5.
Time
evolution
of
minimum
inlet
cross-sectional
area
for
Moriches
and
Shinnecock
Inlets
based
on
Czerniak
(1977)
and
Morang
(1999).
Larson,
Kraus,
and Hanson
11
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