Hydraulic Interpretation of Sand Size Distributions

Grain size analysis is an essential tool for classifying sedimentary environments. The calculation of statistics for many samples can, however, be a laborious process. A computer program called GRADISTAT has been written for the rapid analysis of grain size statistics from any of the standard measuring techniques, such as sieving and laser granulometry. Mean, mode, sorting, skewness and other statistics are calculated arithmetically and geometrically (in metric units) and logarithmically (in phi units) using moment and Folk and Ward graphical methods. Method comparison has allowed Folk and Ward descriptive terms to be assigned to moments statistics. Results indicate that Folk and Ward measures, expressed in metric units, appear to provide the most robust basis for routine comparisons of compositionally variable sediments. The program runs within the Microsoft Excel spreadsheet package and is extremely versatile, accepting standard and non-standard size data, and producing a range of graphical outputs including frequency and ternary plots.

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“…Distributions using these scales are termed 'log-normal', and are conventionally used by sedimentologists (e.g. Visher, 1969;Middleton, 1976).…”

Section: Fundamentals Of Grain Size Analysismentioning

confidence: 99%

GRADISTAT: a grain size distribution and statistics package for the analysis of unconsolidated sediments

Blott¹,

Pye²

2001

Earth Surf Processes Landf

3,288

1,668

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“…Less consideration has been given to grain-size distributions of sediments transported or settled in glacial meltwater streams (Rainwater and Guy, 1961;Ziegler, 1974;Bogen, 1979Bogen, , 1980Fenn and Gomez, 1989), whereas several investigations of this subject have been carried out in non-glaciated areas (Folk and Ward, 1957;Bagnold, 1968;Visher, 1969;Sengupta, 1975;Middleton, 1976;Walling and Moorehead, 1987) .…”

Section: Introductionmentioning

confidence: 99%

Variations in grain-size distribution of suspended sediment in a glacial meltwater stream, Austre Okstindbreen, Norway

Karlsen

1991

J. Glaciol.

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ABSTRACT. Thirty-nine samples of suspended sediment from the meltwater stream of Austre Okstindbreen, Norway, were analysed using both moments and parameters of the hyperbolic distribution. The samples turned out to be non-normally distributed. No direct correla tion was found between discharge and grain-size distribution, but it is supposed that the hydraulic influence is hidden behind factors like composition of morainic or stream-bed materia!' Through comparison of the grain-size parameters from two periods in the field season, it was possible to distinguish between two sediment populations.

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“…1) with those of Vi s h er (1969( , 1104, the analyzed distribution of grain sizes are interpreted as a prod uct of fluvial sedimentary environment. The detailed hydrodynamic interpretations, as made on the basis of grain size distribution by Middleton (1976), Brey er (1979) and others, are beyond the frame of the present study. Only that Middleton (1976) determined the average shear velocity of the transporting medium on the basis of the interruption (position of inflection point) between the populations of grain sizes that are transported by rolling and sliding, and the population of grain sizes in intermittent suspension that coincides with the lower part of the population of salta tion grains shall be mentioned.…”

Section: Discussion and Interpretationmentioning

confidence: 78%

Interpretation of Depositional Environment Based on Grain Size Distribution of Sandstones of the Val Gardena Formation in the Area Between Cerkno and Smrečje, Slovenia

Skaberne¹

1996

Geologija

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Hydraulic Interpretation of Sand Size Distributions

Cited by 235 publications

References 29 publications

GRADISTAT: a grain size distribution and statistics package for the analysis of unconsolidated sediments

GRADISTAT: a grain size distribution and statistics package for the analysis of unconsolidated sediments

Variations in grain-size distribution of suspended sediment in a glacial meltwater stream, Austre Okstindbreen, Norway

Interpretation of Depositional Environment Based on Grain Size Distribution of Sandstones of the Val Gardena Formation in the Area Between Cerkno and Smrečje, Slovenia

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