NAME
modein - Computation of total sediment discharge by the modified
Einstein procedure
ABSTRACT
MODEIN computes total sediment discharge at a cross section of an
alluvial stream having primarily a sand bed from measured hydraulic
variables, the concentration and particle-size distribution of the
measured suspended sediment, and the particle-size distribution of
the bed material.
METHOD
The computation involves the extrapolation of the measured
suspended-sediment discharge to represent the total suspended-
sediment discharge and the addition of a computed bedload discharge.
The procedure is applicable only if measured data are available so
it cannot be used directly for design or predictive purposes. It is
intended to be used only at sites where all of the bed material is
finer than about 16 millimeters, and it can be used only if a
significant part of the measured suspended sediment is composed of
particles of the same size as particles in the bed material.
HISTORY
Version 1.4 1998/01/16 - First release of original program as ported
and after code clean-up for use on UNIX workstations.
DATA REQUIREMENTS
Input for MODEIN is generated during an interactive session using
the program MEPDATA. MEPDATA generates a direct access file that is
read by MODEIN. The following data are prompted for by MEPDATA to
form the MODEIN data set:
measurement location
date of measurement
time of measurement
water discharge
top width of cross section
mean depth in cross section
water temperature
minimum percentage of both suspended sediment and bed
material
particle size at which 35 and 65 percent of the bed material
by weight is finer
concentration of measured suspended sediment
average depth at the sampling verticals
distance between the bottom of the sampled zone and
streambed
Z values
percent by weight of measured suspended sediment
percent by weight of bed material
SYSTEM REQUIREMENTS
MODEIN is written in Fortran 77. Generally, the program is easily
installed on most computer systems. The code has been used on UNIX-
based computers and DOS-based 386 or greater computers having a math
coprocessor and 1 mb of memory.
DOCUMENTATION
Stevens, H.H., 1985, Computer program for the computation of total
sediment discharge by the modified Einstein procedure: U.S.
Geological Survey Water-Resources Investigations Report 85-4047,
77 p.
REFERENCES
Folk, R.L., 1968, Petrology of Sedimentary Rocks: Austin, Hemphill
Publishing Co., p. 44-50.
Inman, D.L., 1952, Measures for describing the size distribution of
sediments: Journal of Sedimentary Petrology, v. 22, no. 3, p.
125-245.
Krumbein, W.C., 1936, Application of logarithmic moments to size
frequency distribution of sediments: Journal of Sedimentary
Petrology, v. 6, no. 1, p. 35-47.
Trask, P.D., 1932, Origin and environment of source sediments of
petroleum: Houston, Gulf Publishing Co., 323 p.
CONTACTS
Operation and Distribution:
U.S. Geological Survey
Hydrologic Analysis Software Support Program
437 National Center
Reston, VA 20192
h2osoft@usgs.gov
Official versions of U.S. Geological Survey water-resources analysis
software are available for electronic retrieval via the World Wide
Web (WWW) at:
http://water.usgs.gov/software/
and via anonymous File Transfer Protocol (FTP) from:
water.usgs.gov (path: /pub/software).
The WWW page and anonymous FTP directory from which the MODEIN
software can be retrieved are, respectively:
http://water.usgs.gov/software/modein.html
--and--
/pub/software/surface_water/modein
SEE ALSO
mepdata(1) - Data entry program for modein
sedsize(1) - Particle-size statistics of fluvial sediments
sizedata(1) - Data entry program for sedsize