The numerical simulation of the average reverberation intensities in shallow water

A reverberation model for estimating the average reverberation inten-sity in layered shallow water is presented.The reverberation intensity is calculated interms of ray theory for short range and normal mode theory for long range.Thecalculation accuracy has been improved by taking into account the effect of complexeigenvalues on the incident normal mode field.From the comparison between dif-ferent scattering models it has been shown that the separable bistatic-backscatteringmodel is acceptable.This makes it possible to calculate reverberation by using onlythe monostatic-backscattering coefficient and to save greatly the computing time.