Books > Science & Mathematics > Physics > Classical mechanics > Sound, vibration & waves (acoustics)
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Ocean Acoustics (Paperback, Softcover reprint of the original 1st ed. 1979)
Loot Price: R2,942
Discovery Miles 29 420
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Ocean Acoustics (Paperback, Softcover reprint of the original 1st ed. 1979)
Series: Topics in Current Physics, 8
Expected to ship within 10 - 15 working days
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This Topics volume is devoted to a study of sound propagation in
the ocean. The effect of the interior of the ocean on underwater
sound is analogous to the effect of a lens on light. The oceanic
lens is related, as in light propagation, to the index of
refraction of the medium. The latter is giv n by the ratio of the
sound frequency to the speed of sound in water, typi ca lly about
1500 m s -1. It is the vari ation of the sound speed due to
changing temperature, density, salinity, and pres sure in the
complex ocean environment which creates the lens effect. Many
oceanic processes such as currents, tides, eddies (circulating,
translating regions of wa ter), and internal waves (the wave-like
structure of the oceanic density variabil ity) contri bute in turn
to the changes in sound speed'. The net effect of the ocean lens is
to trap and guide sound waves in a channel created by the lens. The
trapped sound can then propagate thousands of miles in this oceanic
waveguide. In addition to the propagation in the interior of the
ocean, sound can propagate into and back out of the ocean bottom as
well as scatter from the ocean surface. Just as the sound produced
by a loudspeaker in a room is affected by the walls of the room, so
the ocean boundaries and the material properties below the ocean
bottom are essential ingredients in the problem."
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