Transmission loss in a shallow ocean over a two-layer seabed

Three mathematical models of a two!layer seabed are considered[ The _rst assumes that both layers are elastic solids\ the second that the upper layer is poroelastic while the substrate is elastic\ and the third that both layers are poroelastic[ The _rst and third models are found to produce reasonable agreement with data and each other\ but the second model produces poor predictions because of mathematical incompatibilities of the poroelastic and elastic models[ 0887 Elsevier Science Ltd[ All rights reserved