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Water waves lose energy into bottom sediments when the water is relatively shallow.
This applet allows the calculation of the damping rate for a wave in water of a given depth over an infinitely thick porous bottom layer. The damping after travelling a distance, xd, is also given. It is the Reid and Kaijura solution that is used here. Reid, R.O. and K. Kaijura, On the Damping of Gravity Waves over a Permeable Seabed, Trans.