EXPERIMENT ON SOUND PROPAGATION IN SHALLOW WATER WITH VELOCITY STRUCTURE

An investigation into the propagation of sound in shallow, isovelocity water was carried out previously using an extensive area of the continental shelf off the west coast of New Zealand. This area has been re†examined when a negative velocity gradient was present in the water layer. The results obtained show that this area provides a classic example of normal†mode propagation in shallow water under conditions of both constant sound velocity and a negative gradient. The values of attenuation obtained are on the whole greater when a negative gradient occurs, but their general behavior with frequency is similar in both cases. In addition, the attenuations are comparable with those obtained in other shallow†water areas and are consistent with the predictions of normal†mode theory. © 1968, Acoustical Society of America. All rights reserved.