Parameter (and formula) to describe stability of grains in flowing water
Original diagram of Shields, 1936
The Shields formula is a formula for the stability calculation of granular material (sand, gravel) in running water.
The stability of granular material in flow can be determined by the Shields formula or the Izbash formula. The first is more suitable for fine grain material (such as sand and gravel), while the Izbash formula is more suitable for larger stone. The Shields formula was developed by Albert F. Shields (1908-1974). In fact, the Shields method determines whether or not the soil material will move. The Shields parameter thus determines whether or not there is a beginning of movement.[1][2]
^Shields, A. (1936). Anwendung der Aehnlichkeitsmechanik und der Turbulenzforschung auf die Geschiebebewegung [Application of similarity mechanics and turbulence research on shear flow] (PDF). Mitteilungen der Preußischen Versuchsanstalt für Wasserbau (in German). Vol. 26. Berlin: Preußische Versuchsanstalt für Wasserbau. Archived from the original on 2011-07-18.
^Shields, A. (1936). "Application of similarity principles and turbulence research to bed-load movement (translated version)". Caltech Library. Mitteilungen der Preußischen Versuchsanstalt für Wasserbau. 26. Berlin: Preußische Versuchsanstalt für Wasserbau.
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developed by Albert F. Shields, and is called later Shields parameter. The Shields parameter is the main parameter of the Shieldsformula. It is given by: τ...
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