Short-Range Acoustic Propagation Variability on a Shelf Area with Strong Nonlinear Internal Waves
Abstract
During April 2007 a six-day long experiment was
conducted to measure internal waves and their acoustic effects at
a continental shelf site in the Northern South China Sea. The site
is slightly west of the edge of the shelf. At the shelf edge, large
internal waves originating in the Luzon Strait area enter shallow
water from deep water, undergoing rapid dissipation and wave
shape evolution. A moored acoustic source transmitted 400-Hz
pulses 3.0 and 6.0 km to two moored vertical line arrays, with
geometry such that the propagation path was roughly parallel to
the crests of the strongest passing internal waves, so that strong
horizontal refraction effects are expected. Internal-wave
characteristics and effects of the internal waves on the sound
propagation, both observed and modeled, are shown here.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
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