Numerical Modeling of the Sound Propagation Under Rough Sea Surface of the PM Spectrum

摘要

Sea surface, acting as the top boundary of the waveguide, can significantly affect underwater acoustic propagation. The rough sea surface has, not only reflection effect, but also scattering effect on acoustic wave, which leads to reflection loss. Based on Kirchhoff Approximation scattering theory and Small Slope Approximation scattering theory, Krakenc-KA(Kirchhoff Approximation, KA) and Krakenc-SSA (Small Slope Approximation, SSA) sound propagation models are put forward. The numerical simulation result shows that the horizontal locations of the interference peak and trough of acoustic field are changed when Krakenc-SSA model is used as the reflection coefficient calculated using SSA theory can change the phase of the field, while it is not like that when Krakenc-KA model is used. Moreover, using monte-carlo method to generate one-dimensional rough sea surface, Ramsurf sound propagation models are compared with Krakenc-KA model and Krakenc-SSA model under rough sea surface of PM spectrum.