Definition and Use of the Phi Grade Scale.
Coastal engineering technical aid rept.,
COASTAL ENGINEERING RESEARCH CENTER FORT BELVOIR VA
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The Unified Soils, Wentworth, and phi grade scales are commonly used by coastal engineers to describe sediment texture. Of these, the phi scale is least understood. This report discusses why the phi scale was proposed initially, and how and when it should be used. Formulas and methods are presented for using the phi notation, calculating the mean grain size, and sorting of sediment samples, and for converting between phi-and millimeter-based size scales. Sample calculations show how the phi grade scale can be used to classify and analyze sediment texture.
- Geology, Geochemistry and Mineralogy
- Soil Mechanics