This small scale laboratory study deals with the action of monochromatic or bichromatic waves on a sand bed of initial constant slope. The aim was to address the effects of nonlinear wave-wave interactions onto bed evolution and bar formation. Properties of a spurious wave, produced either by the wavemaker or by rapidly varying bathymetry, were used to obtain or not nonlinear interactions. A strong relation between the wave envelope and the bathymetric profile was found in the breaking case as in non-breaking wave conditions.
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