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Abstract
The interaction between waves and a fluid-mud layer is studied theoretically and experimentally in the present paper. In addition the effects of a net current, or a net current together with waves are investigated. Experiments were carried out in a wave-current flume using two artificial muds. It was found that turbulence intensities in the water layer decreased when a layer of fluid mud was present. The observed wave decay and the wave-induced velocities in the liquefied bed agreed well with those calculated using a modified version of a model due to Gade (1958). The experiments also showed that observations or measurements made at a sidewall should be interpreted with care.