About This Item

Share This Item

The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)

Abstract


Journal of Sedimentary Research, Section A: Sedimentary Petrology and Processes
Vol. 67 (1997)No. 3. (May), Pages 527-530

Comparison of Sphericity Indices as Related to the Hydraulic Equivalence of Settling Grains

J. P. Le Roux

ABSTRACT

Six of the most commonly used sphericity indices are examined to determine which is most suitable for predicting the settling Previous HitvelocityNext Hit of nonspherical grains. Direct comparison is facilitated by normalizing the different measures for the same set of pebbles, which range in shape from spheroids, ellipsoids and disks, to blades. Regression Previous HitanalysisTop of the normalized sphericity indices plotted against the settling ratio (a modified dynamic shape factor) shows that the best index is the Hofmann (1994) shape entropy, followed by the sphericity measures of Aschenbrenner (1956) and Wadell (1932). The Corey (1949), Sneed and Folk (1958), and Janke (1966) shape factors are less suitable for a wide range of particle shapes. This is in contrast to some previous comparisons of the same indices. >


Pay-Per-View Purchase Options

The article is available through a document delivery service. Explain these Purchase Options.

Watermarked PDF Document: $14
Open PDF Document: $24