Author(s): E. Amiri-Tokaldany; S. M. Sadat-Helbar; A. Shafaie
Linked Author(s): Ebrahim Amiri-Tokaldany
Keywords: Fall velocity; Sediment particles; River engineering; Reynolds numberrelative density
Abstract: Estimating the fall velocity of sediment particles is a fundamental requirement when modeling sediment transport. Many attempts to estimate the fall velocity have been carried out by a range of researchers over the last 40 years, so a large number of relations for different particle sizes across various conditions are available in the literature. However, the number of relations can cause confusion and it is not always clear which relation is the most suitable. In this study, we have examined and reevaluated 22 relations published by 17 researchers during the period 1933-2007, developing a new relation in the process. The new relation has been verified using two sets of laboratory data. The mean relative error of 11.7% indicates that despite the simplicity of the relation, there is a good agreement between observed and predicted data.
Year: 2009