Abstract

A preliminary study of underwater sound in the presence of internal waves is presented. The medium through which the sound travels and the internal wave are idealized but both approximate summer conditions in shallow water off the coast at San Diego, California. The ray paths, sound intensity field, and the transmission anomaly field were determined by machine computation and the data are shown graphically. The results indicate that internal waves can cause 22 db change in sound intensity over a distance of about one-half the internal wavelength. Future experiments at sea and additional computations which are based on this study are briefly discussed.

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