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Costal Inlets Research Program
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> Fig. 11. Hyperbolic-tangent fit to Drakes Bay, California.
Fig. 10. Plot of a versus b values for hyperbolic-tangent shape and best-fit line.
ACKNOWLEDGEMENTS - cs99-moreno0014
cs99-moreno
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2,000
m
Fig.
11.
Hyperbolic-tangent
fit
to
Drakes
Bay,
California.
Fig.
12.
Hyperbolic-tangent
fit
to
Rosas
Bay,
Spain.
CONCLUSIONS
A
database
comprising 23
beaches
in
Spain
and
23
beaches
in the
North
America
was
developed
to examine
the
equilibrium
shapes
of headland-bay
beaches.
Convenient
software
routines
were
written
to
automate
the
fitting
process
and
make
it
objective
(not
discussed
in
this
paper). It is noted
that
such
shapes
are
applicable
to
coasts
with
a
consistent
predominant
direction
of
net
longshore
sediment
transport.
Based
on
our
study,
it is
straightforward
to
fit
the
log
spiral
to
shoreline-position
data,
but
this
equilibrium
shape
cannot
describe
beaches
with
only
one
headland. In
addition, the
log
spiral
is
sensitive
to the
angular
parameter
defining
it.
For
one-headland
Moreno
&
Kraus
13
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