Author(s): H. L. Monteith; G. Pender; A. B. Schvidchenko
Linked Author(s): Gareth Pender
Keywords: Graded sediments; Bedload sheets; Bedload
Abstract: Flume experiments were conducted in order to investigate the mechanism of graded sediment marginal transport within a compound channel. Results are presented that illustrate a 26.4% reduction in the average bedload transport rate as in-bank flow spills overbank. This is attributed to the decrease in bed shear stress and relative inefficiency of the flood channel cross-section. Pulsations in the sediment transport rate were caused by the migration of long, low amplitude bedload sheets and were of greatest amplitude during bankfull flow and feed conditions. Bedload sheets formed the dominant mode of sediment transport and responded to changes in the conditions imposed upon the system by the adjustment of the height of the crest of the bedform.
Year: 2003