SAND TRANSPORT UNDER GROUPING WAVES

Abstract

Laboratory experiments as well as numerical modeling were conducted for sand transport under non-breaking grouping waves. Experiments showed that the direction of net transport of fine sand was onshore under grouping waves although it was offshore under monochromatic waves with equivalent wave height. It was also revealed that the long wave bounded to wave group plays an important role in particular for suspended load. A numerical model was developed on the basis of the second-order Stokes wave theory and one-dimensional diffusion equation of sand concentration. The validity of the model was confirmed with experimental data.