Abstract
The consequences of a very simple formula for underwater acoustic transmission loss are explored, coping with bottom losses and any slow variations in depth but restricted here to water without vertical sound velocity gradients. The intensity-range laws are given for many specific depth profiles. In constant-depth water the intensity varies as ( range) − 3 2 , and it is shown that to obtain (range)-' or (range)-' the necessary profile in each case involves a constant gradient. For a profile having a step the energy concentration effect in the shallower water (depth ratio d) may be counter-balanced by the greater attenuation on the plateau; for small A this occurs when the ratio of path lengths in the shallower and deeper water is also A. Comments on time dispersion are included in the Appendix.
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