Incipiency of Sediment Motion Under Combined Waves and Currents
Keywords:Shear stress, longshore transport, sediment, effective stress, coastal zone
A new formula for nearbottom shear stress under waves and currents was obtained as a result of experiments on the threshold of sediment motion in a laboratory channel. This work supports the hypothesis of the effective shear stress composition in combined flows. A modified longshore sediment transport formula was obtained by adapting the Engelund-Hansen formula in conjunction with the new shear stress formulation. The modified longshore sediment transport formula has a better correlation with the CERC formula than the original Engelund-Hansen formula.