Acoustic Fluctuations Due to Shallow Water Thermal Microstructure

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Naval Postgraduate School, 1974 - Underwater acoustics - 310 pages
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Simultaneous measurements of waves, orthogonal water particle velocities, temperature, conductivity and acoustic phase and amplitude measurements at 20 and 40 kHz over horizontal and vertical, 2m paths were made at the Navel Underwater Center oceanographic tower, San Diego in April 1974. Four stochastic models for acoustic propagation including geometric, Born, Rytov and Debye approximation models were tested. Taylor thermal microscales from spatial correlation analyses determined vertically across the thermocline varied from 6.8 to 178 cm. Temporal stochastic analyses showed horizontal acoustic path losses were ten times vertical losses because of diffraction effects.

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Contents

INTRODUCTION
10
EXPERIMENT AND DATA ANALYSIS
28
EXPERIMENT RESULTS
44

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