Abstract
Grain sizes of natural sediments can be determined by direct measurement of orthogonal axis dimensions, or alternatively by sieve or settling tube analysis. As these different techniques do not always give compatible results, published equations for modelling the hydrodynamic or aerodynamic behavior of particles have limited application. In this paper, an Excel program, which allows input from all three methods, is presented. The program calculates the settling velocity of spheres and ellipsoids as well as the critical shear stress at incipient grain motion in unidirectional fluid flow. Additional information includes the shape entropy of the particles, the drag coefficient, Reynolds numbers, and critical shear velocity. As the equations apply to particles of different densities in various liquids or gases, the program can be used for unusual situations such as modelling sediment entrainment on other planets.
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