Abstract
Amplitude attenuation for the solitary wave propagating over a porous bed of finite or infinite depth is derived assuming irrotational motion in the fluid above. Velocity components in the porous bed are derived for small-amplitude solitary waves and bores. Attenuation rates are compared with known results for frictional dissipation and the conclusion drawn that a porous bed contributes very significantly to wave damping. The motion in the porous bed due to a pressure distribution simulating the passage of a bore is analyzed and its influence on the dissipation processes in a bore discussed. Fluidization of the porous bed under bores and steep fronted waves is considered.
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