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Author : Robert J. Urick
Publisher :
ISBN 13 :
Total Pages : 272 pages
Book Rating : 4.:/5 (318 download)
Download or read book Sound Propagation in the Sea written by Robert J. Urick and published by . This book was released on 1979 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Calvin H. Wilcox
Publisher : Springer
ISBN 13 : 9780387909868
Total Pages : 0 pages
Book Rating : 4.9/5 (98 download)
Download or read book Sound Propagation in Stratified Fluids written by Calvin H. Wilcox and published by Springer. This book was released on 1984-04-23 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stratified fluids whose densities, sound speeds and other parameters are functions of a single depth coordinate occur widely in nature. Indeed, the earth's gravitational field imposes a stratification on its atmosphere, oceans and lakes. It is well known that their stratification has a profound effect on the propagation of sound in these fluids. The most striking effect is probably the occurrence of acoustic ducts, due to minima of the sound speed, that can trap sound waves and cause them to propagate hori zontally. The reflection, transmission and distortion of sonar signals by acoustic ducts is important in interpreting sonar echoes. Signal scattering by layers of microscopic marine organisms is important to both sonar engi neers and marine biologists. Again, reflection of signals from bottom sediment layers overlying a penetrable bottom are of interest both as sources of unwanted echoes and in the acoustic probing of such layers. Many other examples could be given. The purpose of this monograph is to develop from first principles a theory of sound propagation in stratified fluids whose densities and sound speeds are essentially arbitrary functions of the depth. In physical terms, the propagation of both time-harmonic and transient fields is analyzed. The corresponding mathematical model leads to the study of boundary value problems for a scalar wave equation whose coefficients contain the pre scribed density and sound speed functions.
Author : United States. Environmental Science Services Administration
Publisher :
ISBN 13 :
Total Pages : 462 pages
Book Rating : 4.3/5 (91 download)
Download or read book Acoustic-gravity Waves in the Atmosphere written by United States. Environmental Science Services Administration and published by . This book was released on 1968 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : John A. Colosi
Publisher : Cambridge University Press
ISBN 13 : 1107072344
Total Pages : 443 pages
Book Rating : 4.1/5 (7 download)
Download or read book Sound Propagation through the Stochastic Ocean written by John A. Colosi and published by Cambridge University Press. This book was released on 2016-06-20 with total page 443 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book, key discoveries in the field of statistical ocean acoustics over the last 35 years are addressed with illustrations from ocean observations.
Author : Thomas Martin George
Publisher :
ISBN 13 :
Total Pages : 52 pages
Book Rating : 4.3/5 ( download)
Download or read book A Program for Calculating Three-dimensional Acoustic-gravity Ray Paths in the Atmosphere written by Thomas Martin George and published by . This book was released on 1971 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ITS-Jones-Haselgrove ray-tracing program is adapted to calculate acoustic-gravity ray paths in a compressible atmosphere with arbitrary three-dimensional wind and temperature variability and spherical earth. The program and its use are described, including deck listings and sample runs. Application to ocean acoustics should be possible with little modification.
Author : Robert J. Urick
Publisher : Peninsula Pub
ISBN 13 : 9780932146083
Total Pages : 226 pages
Book Rating : 4.1/5 (46 download)
Download or read book Sound Propagation in the Sea written by Robert J. Urick and published by Peninsula Pub. This book was released on 1982 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rated the most up-to-date source on underwater sound propagation in the current literature. The book covers these topics and more: Basic theory; velocity of sound in the ocean; attenuation and absorption; computer models of sound propagation; reflections and scattering by the sea surface and the sea bottom; temporal and spatial coherence; and multipath in the sea.
Author : L.M. Brekhovskikh
Publisher : Springer Science & Business Media
ISBN 13 : 9780387954677
Total Pages : 304 pages
Book Rating : 4.9/5 (546 download)
Download or read book Fundamentals of Ocean Acoustics written by L.M. Brekhovskikh and published by Springer Science & Business Media. This book was released on 2003-03-18 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides an up-to-date introduction to the theory of sound propagation in the ocean. The text treats both ray and wave propagation and pays considerable attention to stochastic problems such as the scattering of sound at rough surfaces and random inhomogeneities. An introductory chapter that discusses the basic experimental data complements the following theoretical chapters. New material has been added throughout for this third edition. New topics covered include: - inter-thermocline lenses and their effect on sound fields - weakly divergent bundles of rays - ocean acoustic tomography - coupled modes - sound scattering by anisotropic volume inhomogeneities with fractal spectra - Voronovich's approach to sound scattering from the rough sea surface. In addition, the list of references has been brought up to date and the latest experimental data have been included.
Author : J. J. do Rêgo Silva
Publisher : Computational Mechanics
ISBN 13 : 9781853122934
Total Pages : 134 pages
Book Rating : 4.1/5 (229 download)
Download or read book Acoustic and Elastic Wave Scattering Using Boundary Elements written by J. J. do Rêgo Silva and published by Computational Mechanics. This book was released on 1994-01-01 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of wave propagation in solids and fluids is of importance in many branches of physics and engineering. This book concentrates on the propagation of acoustic and harmonic waves in three-dimensional regions. The problems are formulated using integral equations and their numerical solutions are obtained through the boundary element method.
Author : Norman Bleistein
Publisher : Springer
ISBN 13 :
Total Pages : 308 pages
Book Rating : 4.:/5 (318 download)
Download or read book Ocean Acoustics written by Norman Bleistein and published by Springer. This book was released on 1979-03 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Author : Andrew Grigorievitch Semenov
Publisher :
ISBN 13 : 9781536126099
Total Pages : 0 pages
Book Rating : 4.1/5 (26 download)
Download or read book Ultra Low Frequency Fields of Moving Bodies written by Andrew Grigorievitch Semenov and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new approach to body detection and control based on its unavoidable ultra-low frequency (ULF) oscillation related to its motion in media (mainly, in the ocean) is presented. The main concept of this approach lies in enriching the list of moving body control enabling factors by influence of ULF oscillations on the bodys outer fields. It is shown that ULF oscillation of a moving body could be detected in the atmosphere or in the ocean directly with the aid of ambient fluid ULF pressure or velocity changes, say, observed inside an oceanic layer or on the oceans surface. But ULF oscillations indirect appearance is demonstrated to be the most important for submerged moving body detection. This appearance comprises an additional ULF modulation (distortion) of outer natural sound fields related to ocean wind noise and distant shipment noise in forward scattering. The physical analogy an indirect moving body ULF oscillation is justified in the book and could be partly compared to the recent universe gravity waves detection discovery in 2016 with the aid of electromagnetic wave distortion that is provided by gravity wave propagation. Specifics of sound scattering by flow inhomogeneity generated by a moving body were demonstrated in Acoustics of Moving Inhomogeneities, which was published recently by Nova Science Publishers. However, this very book is devoted in particular to the modulation of forward scattered sound fields of the ULF field provided by a moving body and the application of corresponding results to its control in the ocean, as well as mainly to submerged submarine control. Proposed detection methods are independent of a moving bodys self-noise level. Their application requires consideration of the ambient flow (including surface gravity wave flows) contribution to sound diffraction by the finite size moving body, mainly in forward scattering. A lot of known diffraction problem results should be revised in the light of a moving body ULF field. Examples of practical applications are presented, showing that moving body detection (especially in deep water ocean regions with the aid of natural outer field ULF modulation) is successfully achieved. Detection in shallow water regions is slightly worse due to a smaller wave inhomogeneity scale and when the natural ULF hydrodynamics noise field level increased. It is shown that body detection distances being thought as unachievable are realised in light of these new moving body ULF field effects. The book is aimed at providing a new approach to external fields of a moving body, mainly submarines. This version of submarine detection is practically substantiated and proven to be effective in Russia for various ocean regions with the aid of various types of arrays. Conclusions substantiated in the book are recommended for practical application. At the same time, additional efforts of scientists, hydroacoustics and naval equipment specialists related to various ULF field applications based on theory predictions are necessary.
