Abstract
The effects of random fluctuations in an ocean current on underwater cw sound transmission between a bottomed source and receiver are determined for an ocean channel with a linear, depth‐dependent sound speed. A horizontal, depth‐dependent current, each of whose components belongs to a random process, is considered. Effects of this model on ray geometry are examined and six basic current‐induced ray states are found. Conditions are specified so that only one state occurs. In this case, approximations for travel times, total‐field intensity, and their first and second moments are obtained using ocean‐current data. Significant changes in these moments can occur, depending on such current properties as correlation length and amplitude variance. For example, at the receiver a 9‐dB difference between mean intensity and intensity without current may arise, while the standard deviation of intensity may attain 3 dB. Useful bounds for intensity moments are derived which vary slowly with range except near certain critical ranges. [Work supported by ONR.]
Published Version
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