Recent progresses on shallow water reverbervation

In shallow water, the reverberation is often the most severe limiting factor in relation to the use of active sonar systems for target detection, and it is of great interest to underwater acousticians. In this paper, some recent progresses on the experiment and theory of shallow water reverberation are presented. The data were obtained from several experiments at different sites in different seasons. Some of the progresses include: (1) Ray-Mode reverberation model, which can be used to calculate the reverberation intensity; (2) Coherent reverberation model, which was developed to explain the observed oscillation phenomenon of the reverberation loss; (3) The bottom inversion from the reverberation; (4) Theoretical and experimental results of the spatial correlation of the reverberation, (5) Experimental results of the direction of the reverberation, etc.