NAMEsedsize - Particle-size statistics of fluvial sedimentsABSTRACTSEDSIZE computes Inman, Trask, and Folk statistical parameters based on phi values and sizes determined for the percent-finer values of 5, 16, 25, 35, 50, 65, 75, 84, 90, and 95 from up to 33 input particle-size, and percent-finer data pairs. The program also determines the percentages of gravel, sand, silt, and clay, and the Meyer-Peter effective diameter.METHODVarious investigators have developed sets of statistical measures to quantify certain features of fluvial particle-size distributions. These values can then be used for comparisons between samples and other analytical purposes. These statistics are based on the sizes of particles for which certain percentages of the sample are either finer or coarser. Trask (1932) describes the particle-size distribution using a length (millimeter) dimensional notation; whereas, Inman (1952) and Folk (1968) use a dimensionless phi notation developed by Krumbein (1936). The program determines the values required by each method using linear interpolation and extrapolation.HISTORYVersion 1.9 1997/06/02 - Fixed problem with end of file check on read of direct access files. Version 1.8 1995/08/11 - Code clean-up, prompts in mixed case Version 1.4 1994/10/26 - Fortran version as ported to UNIX workstations 1986 - first release -- Fortran version for use on Prime computers and a BASIC version for use on personal computersDATA REQUIREMENTSSize-distribution data are entered using the interactive program SIZEDATA. Each distribution (data set) consists of a station description (up to 80 characters), date of sample, time of sample, number of particle diameter sizes (up to 33), the diameter sizes in millimeters, and the percent-finer value for each size. Percent- finer values of 0 are ignored by the program.SYSTEM REQUIREMENTSSEDSIZE is written in Fortran 77 with the following extension: use of variable names longer than six characters. 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.DOCUMENTATIONStevens, H.H., and Hubbell, D.W., 1986, Computer programs for computing particle-size statistics of fluvial sediments: U.S. Geological Survey Water-Resources Investigations Report 86-4141, 72 p.REFERENCESFolk, 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.CONTACTSOperation 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 SEDSIZE software can be retrieved are, respectively: http://water.usgs.gov/software/sedsize.html --and-- /pub/software/surface_water/sedsizeSEE ALSOsizedata(1) - Data entry program for sedsize

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