Sediment Transport Functions
The following sediment transport functions have been incorporated into SAM.
Except for Brownlie, these functions are also available in HEC-6. Some are
identified as "d50" which means the original version was for a single grain size.
That capability is provided in SAM.sed. The HEC-6 versions of the functions
calculate by grain size class and that capability is also in SAM.sed.
Table 7. Sediment Transport Functions available in SAM.sed.
MPM (1948), D50
PARKER
ACKERS-WHITE.
PROFITT (SUTHERLAND)
ACKERS-WHITE, D50
SCHOKLITSCH
BROWNLIE, D50
TOFFALETI.
COLBY
TOFFALETI-MPM
EINSTEIN (BED-LOAD)
TOFFALETI-SCHOKLITSCH
EINSTEIN (TOTAL-LOAD)
YANG
ENGELUND-HANSEN
YANG, D50
LAURSEN (COPELAND)
VAN RIJN
LAURSEN (MADDEN), 1985
MEYER-PETER and MULLER
(MPM) (1948)
Ackers-White is a version of Ackers-White (1973) which has been modified, at
WES, for multiple grain size calculations on sand and/or gravel
bed streams. Modifications made by Ackers (1993) have been
incorporated.
Ackers-White, D50
is a single grain size function.
Brownlie (1981) is a single grain size function for sand transport.
Colby (1964)
is a version of Colby's single grain size function which has been
modified at WES for multiple grain size calculations. It is valid
for sand transport in streams and small rivers.
Einstein (Bed-load) (1950) is a multiple grain size function used to calculate the
bed-load discharge of sand and/or gravel bed streams. The
hiding factor has been modified at WES, incorporating the work
of Pemberton (1972) and Shen and Lu (1983).
Einstein (Total-load) (1950) is a function that extends the Einstein bed-load
calculations to include suspended load by grain size classes and
sums them to get the total load.
Engelund (Hansen) (1967) is a version of Engelund-Hansen D50 which has
been modified at WES for multiple grain size calculations on
sand bed streams.
48
Chapter 3
Theoretical Basis for SAM.sed Calculations
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