Sound Transmission Through a Fluctuating OceanThe ocean is transparent to sound where slight irregularities within the ocean cause sound fluctuations, and thus set limits on the many uses of sound in the ocean, similar to the limits imposed by the atmosphere on ground-based telescopes. This 1979 book attempts to connect the known structure of the ocean volume with experimental results in long-range sound transmission. Theories of wave propagation through irregular media, developed for optical and radio wave transmission are found to be inapplicable in many respects due to the complications of ocean structure, particularly the combination of anisotropy and 'sound channel'. The authors extend wave propagation theory to account for the ocean complications and introduces the path-integral approach to the solution of the strong-scattering regime that solves many long-standing problems. The book is written at the post-graduate level, but has been carefully organised to give experimenters a grasp of important results without undue mathematics. |
Contents
The ocean environment | 1 |
1 | 14 |
2 | 31 |
Linear internal waves | 44 |
4 | 54 |
Introduction to sound transmission in the ocean | 63 |
The wave equation | 74 |
3 | 78 |
7 | 143 |
Theory of sound transmission | 163 |
11 | 189 |
Path integrals and propagation in saturated regimes | 207 |
The transport equation in sound scattering | 220 |
Experimental observations of acoustic fluctuations | 237 |
Cobb seamount | 252 |
Epilog | 269 |
Other editions - View all
Sound Transmission Through a Fluctuating Ocean Roger Dashen,Walter H. Munk,Kenneth M. Watson No preview available - 2010 |
Sound Transmission through a Fluctuating Ocean Roger Dashen,Walter H. Munk,Kenneth M. Watson,Frederik Zachariasen No preview available - 1979 |
Common terms and phrases
acoustic amplitude angle Antarctic apex approximation average Bermuda boundary calculated Chapter coherence computed correlation function correlation length D(Az defined density depth derived dispersion relation displacement energy evaluated exponential expression factor Fourier transform Fresnel zone fully saturated region Gaussian statistics geometrical optics geometrical-optics region given gradient homogeneous horizontal intensity fluctuations internal waves internal-wave isotropic loop micromultipath micropaths microstructure multipath Munk and Zachariasen n-point Gaussian obtained ocean fluctuations parameter partially saturated region path integral path length phase-structure function propagation pulse Q factor quantity range ray path Rayleigh distribution receiver regime result Rytov scale scattering separation sound axis sound channel sound speed sound-speed fluctuations sound-speed profile space spectra spectrum stationary-phase points steep ray surface temperature and salinity turbulence unperturbed ray unsaturated upper turning point valid variance velocity vertical wave equation wavefunction wavelength wavenumber