modein(1) U.S. Geological Survey (wrdapp) modein(1) 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 7 Jul 1998 1 modein(1) U.S. Geological Survey (wrdapp) modein(1) 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 7 Jul 1998 2