Abstract
ABSTRACT A bed-load transport formula was investigated for steady flows, oscillatory flows and combined steady and oscillatory flows. The relationship between the bed-load transport and the total Shields parameter to the power 1.5 was first confirmed for the steady flows. An exponential function to take into account the effect of the critical Shields parameter was introduced. The proposed formula for the steady current was expanded and generalized to take into account the effects of oscillatory flows as well as oscillatory flows with a superimposed current at an arbitrary angle. The time-dependent bed-load transport was treated in a « quasi-steady » manner using the quadratic value of the instantaneous Shields parameter for the two half periods of the wave. A specific study on the effects of sediment phase-lag on net sediment transport was carried out. A good correlation was found between the bed-load model and the measurements for colinear oscillatory and steady flows.
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