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REVIEW OF THE SHALLOW WATER PROPAGATION PROBLEM
NAVY UNDERWATER SOUND LAB NEW LONDON CONN
A brief review of the methods used and of problems in experimentation is presented. The project Texas Tower No. 4 work is summarized. Emphasis is placed on propagation in shallow water, but some deep water observations are included. The principal study is an analysis of sound transmission at frequencies between 89 and 1120 cps. The principal conclusion of the Texas Tower Study is that propagation depends markedly upon the temperature structure of the water, and the topographic features and slope of the bottom. For frequencies below about 250 cps propagation also depends on the geological structure of the medium immediately below the water layer. A good knowledge of the velocity structure of the upper layers of the bottom is obtained from the dispersion phenomenon, and this information is used principally as an aid in the interpretation of the propagation data. The attenuation parameter is found to be a function of water depth, frequency, and of the physical characteristics of the area. Author