Discharge of sands and mean-velocity relationships in sand-bed streams

Abstract

Introduction _______________________________________ Concept of sediment transportation ___________________ Complexity of sediment and streamflow relation-ships__ ______________________________________ Simplifying assumptions.________________________ Bedload discharge ______________________________ Meyer-Peter and Miiller equation___________ Einstein equations __________________________ Bagnold equation.__________________________ Major variables__--____--__-___-_____._____ Suspended-sediment discharge.___________________ Concentration immediately above the bed layer _ Vertical distribution of sediment concentration. _ The classical equation for sediment of one fall velocity._________________________ Theoretical and observed distributions. Equation for flow over dune beds _________ Total sediment discharge..______________________ General methods of computation___________ Fine sediment._____________________________

River adjustment to altered hydrologic regimen - Murrumbidgee River and paleochannels, Australia

“…The sand load transported through a channel can be calculated by the method developed by Colby (1964, fig. 26), if the mean depth of the channel, the median grain size of the bed sediment, and the mean velocity of flow are known.…”

Channel Restoration Design for Meandering Rivers

“…According to Chitale (1996, p. (Colby, 1964). The final Lacey divergence equations are given here as a set of dimensionless equations (rearranged from the original equations):…”

Single and superimposed bedforms: a synthesis of San Francisco Bay and flume observations

“…To accurately characterize the bedmolding velocity in such cases requires calculating the velocity at which the median or modal sediment transport rate occurred during formation of a given bed, and hence, requires knowledge of both the time to form the bed and flow conditions throughout that time. For the slowly responding bedforms in the central bay, median and modal transport rates predicted for neap--spring cycles from current-meter records and Colby's (1964) transport rates occur at velocities approximately equal to peak velocities during tides having the mean tide range (Fig. 7).…”

“…These plots give an estimate of the rate of sediment transport for flows in equilibrium with specified beds. According to Colby (1964), approximately three fourths of predicted transport rates are within a factor of 2 of observed rates. Poorest agreement is for shallow depths, low velocities, and rates measured in flumes.…”

“…In Fig. 12, empirically determined and extrapolated sediment transport rates from Colby (1964) are superimposed on bed-phase plots. These plots give an estimate of the rate of sediment transport for flows in equilibrium with specified beds.…”