ERSC 2P16 Lecture Notes - Lecture 6: Sphericity, Sediment Transport, Graduated Cylinder
2 Aug 2015
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An individual property (rather than a bulk property) that is as fundamental as grain size. Shape can be described in a variety of ways: roundness (how sharp the edges are): a description of how angular the edges of a particle. Grain shape are: sphericity (how spherical it is): how closely a particle"s shape resembles a sphere, form: the overall appearance of a particle, surface texture: scratches, pits, grooves, etc. on a particle"s surface, roundness. Several methods of description; some more practical than others: wadell"s roundness (rw): time consuming and very impractical but results are reliable. Rw: the ratio of the average radius of curvature of the corners on the surface of a grain to the radius of curvature of the largest circle that can be inscribed within the projection of the particle. Rw approaches 1 for a perfectly round particle: dobson and folk roundness (rf)
