Propagation in a waveguide with range-dependent seabed properties.

摘要: The ocean environment contains features affecting acoustic propagation that vary on a wide range of time and space scales. A significant body work over recent decades has aimed at understanding the effects water column spatial temporal variability propagation. Much less is understood about impact seabed properties propagation, which focus this study. Here, simple, intuitive expression for with range-dependent boundary uniform depth derived. It shown incoherent depends upon geometric mean plane-wave reflection coefficient arithmetic cycle distance. Thus, only probability distributions (pdfs) sediment are required. Also, it tends to be controlled by lossiest, not hardest, sediments. range-dependence generally leads higher loss than would expected, due example lossy patches and/or nulls in coefficient. In few instances, can calculated using range-independent properties. theory may useful other (non-oceanic) waveguides.