NORMAL-MODE THEORY OF AVERAGE REVERBERATION INTENSITY IN SHALLOW-WATER

The general expressions of long-range reverberation intensity in shallow water have been developed on the basis of the normal mode theory. Because the effects of the complex eigenvalues on the mode incident field have been considered, the results are more accurate than those in previous former normal mode theories of reverberation. For the sake of simplifying the calculations and making the results convenient to compare with experiments, the reverberation intensity has been smoothed by space averaging. The result shows that when both the source and receiver are located above the thermocline, the long-range reverberation intensity is proportional to r** minus **5. This result is in agreement with the experimental data.