Incipiency of Sediment Motion Under Combined Waves and Currents

I.G. Kantardgi


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.


Shear stress; longshore transport; sediment; effective stress; coastal zone

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