Bagnold-type bed-load equations are widely used for the determination of sediment transport rate in marine environments. The accuracy of these equations depends upon the definition of the coefficient k1 in the equations, which is a function of particle size. Hardisty (1983) has attempted to establish the relationship between k1 and particle size, but there is an error in his analytical result. Our reanalysis of the original flume data results in new formulae for the coefficient. Furthermore, we found that the k1 values should be derived using u1 and u1cr data; the use of the vertical mean velocity in flumes to replace u1 will lead to considerably higher k1 values and overestimation of sediment transport rates.

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