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> Sediment Transport Functions (cont.)
Sediment Transport Functions
Calculations
Cvr-Chpt8
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Laursen
(Copeland)
(Copeland
and
Thomas,
1989)
is a
modification
to
Laursen's
(1958)
multiple
grain
size
function,
extending
its
range
to
larger
gravel
sizes.
Laursen
(Madden)
(Madden,
1993)
is a
multiple
grain
size
function
modified
by
Madden
for
sand
bed transport. It
has
been
used
for
mixtures
of
sand
and
gravel.
There
is a
1963
modification
in
HEC-6
that
is
not
available
in
SAM.
MPM
Meyer-Peter
and
Muller
(1948)
is a
multiple
grain
size
function
for
gravel
bed
rivers.
It is
not
valid
when
appreciable
suspended
load
is
present.
MPM,
D50
--
Meyer-Peter
and
Muller
(1948),
D50
is a
version
of the
multiple
grain
size
function
MPM
which
has
been
modified,
at WES,
using
a
single
grain
size
function.
Parker
(1990)
is a
version
of
Parker's
multiple
grain
size
function.
It
can
be
applied
to
poorly
sorted
gravel
bed
streams.
Finer
sizes,
less
than
2
mm,
must
be
excluded
from
the
specified
surface
size
distribution
and the
gradation
must
be
100%
defined,
i.e.,
there
must
be a
size
for
which
0% of the
material
is
finer.
The
bed
material
sizes
used
must
be representative of the
coarse
upper
layer
of the bed.
Profitt
(Sutherland)
(1983)
is a
multiple
grain
size
function
modification
of the
Ackers-White
formula.
It
can
be
used
on
sand
and/or
gravel
bed
streams.
Schoklitsch
(1930)
is a
version
of the
Schoklitsch
single
grain
size
function
that
has
been
modified
at
WES
for
multiple
grain
size
calculations.
It is
applicable
to
sand
and
gravel
bed
streams
which
do
not
have considerable
amounts
of
suspended
sediment
transport.
Toffaleti
(1968)
is a
multiple
grain
size
function
for
sand
bed
rivers.
It is
not
valid
for
gravel
transport.
Toffaleti-MPM
is a
combined
function
for
sand
and
gravel
bed
streams.
Sediment transport is calculated
using
both
functions
by
size
class.
Calculated
bed
load
from
the
Toffaleti
function
is
compared
to the
total
calculated by MPM and the
larger
is
used
for
bed
load.
Suspended
load
is
then
calculated
using
Toffaleti.
Toffaleti-Schoklitsch
is a
combined
function
for
sand
and
gravel
bed
streams.
Sediment transport is calculated
using
both
functions
by
size
class.
Calculated
bed
load
from
the
Toffaleti
function
is
compared
to the
total
calculated by
Schoklitsch
and the
larger
is
used
for
bed
load.
Suspended
load
is
then
calculated
using
Toffaleti.
49
Chapter
3
Theoretical
Basis
for
SAM.sed
Calculations
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