Abstract
The enduring legacy of the Yalin equation of bedload transport is evaluated. The derivation of the equation includes three innovative aspects: (i) a rigorous use of dimensional analysis to simplify the formulation; (ii) a consideration of the randomness of grain placement rather than turbulence, resulting in a definable threshold of motion; and (iii) the introduction of a physically based, dynamic model of grain saltation into a bedload transport theory. The original relation remains useful today. In addition, the treatment of saltation has inspired an innovative line of research that continues to evolve today.
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