During the summer of 1999, the Applied Physics Laboratory worked with the Alaska Department of Fish and Game, Biosonics Inc., and Hydroacoustics Technology Inc. to make underwater environmental acoustic measurements in Alaska's Kenai and Wood rivers. The goal of these measurements was to understand, and model, the sources and magnitude of background acoustic reverberation, defined as the average acoustic intensity versus time (range) in the absence of any scattering from fish. The background reverberation determines, in part, the minimum size class of fish detectable and the accuracy of fish-tracking and counting algorithms that exploit the complex phase of the fish echo. It is also necessary to establish rigorous...
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