Theoretical and laboratory investigations were performed in order to estimate the rate of mud mass transport under wave action. In the theoretical work, the behavior of soft mud over which waves were propagating was assumed to be similar to a viscous fluid. Then a formula to calculate the rate of mud mass transport was derived by using the analytical solution of mud velocity field. In the laboratory work, spatial distributions and time histories of the mud mass transport rate were measured in a wave flume using kaolinite as a bed material.
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