Author : Naval Postgraduate School (U.S.)
Publisher :
Page : 792 pages
File Size : 33,77 MB
Release : 1967
Category : Dissertations, Academic
ISBN :
Author : Naval Postgraduate School (U.S.)
Publisher :
Page : 628 pages
File Size : 44,98 MB
Release : 1966
Category : Dissertations, Academic
ISBN :
Author :
Publisher :
Page : 992 pages
File Size : 39,27 MB
Release :
Category : Science
ISBN :
Author : Herman Medwin
Publisher : Cambridge University Press
Page : 682 pages
File Size : 31,44 MB
Release : 2005-07-21
Category : Science
ISBN : 9780521829502
Publisher Description
Author : Raymond William Barrow Stephens
Publisher : John Wiley & Sons
Page : 288 pages
File Size : 50,54 MB
Release : 1970
Category : Science
ISBN :
This is an authoritative review of a number of aspects of Underwater Acoustics by leading workers in the field. The book stems from a course of lectures given at Imperial College London for postgraduate students in Engineering and Phyhsics as well as research workers in this subject.
Author : Herman Medwin
Publisher : Academic Press
Page : 739 pages
File Size : 39,3 MB
Release : 1997-11-05
Category : Science
ISBN : 0080532160
The developments in the field of ocean acoustics over recent years make this book an important reference for specialists in acoustics, oceanography, marine biology, and related fields. Fundamentals of Acoustical Oceanography also encourages a new generation of scientists, engineers, and entrepreneurs to apply the modern methods of acoustical physics to probe the unknown sea. The book is an authoritative, modern text with examples and exercises. It contains techniques to solve the direct problems, solutions of inverse problems, and an extensive bibliography from the earliest use of sound in the sea to present references.Written by internationally recognized scientists, the book provides background to measure ocean parameters and processes, find life and objects in the sea, communicate underwater, and survey the boundaries of the sea. Fundamentals of Acoustical Oceanography explains principles of underwater sound propagation, and describes how both actively probing sonars and passively listening hydrophones can reveal what the eye cannot see over vast ranges of the turbid ocean. This book demonstrates how to use acoustical remote sensing, variations in sound transmission, in situ acoustical measurements, and computer and laboratory models to identify the physical and biological parameters and processes in the sea.* Offers an integrated, modern approach to passive and active underwater acoustics* Contains many examples of laboratory scale models of ocean-acoustic environments, as well as descriptions of experiments at sea* Covers remote sensing of marine life and the seafloor* Includes signal processing of ocean sounds, physical and biological noises at sea, and inversions* resents sound sources, receivers, and calibration* Explains high intensities; explosive waves, parametric sources, cavitation, shock waves, and streaming* Covers microbubbles from breaking waves, rainfall, dispersion, and attenuation* Describes sound propagation along ray paths and caustics* Presents sound transmissions and normal mode methods in ocean waveguides
Author : B.R. Kerman
Publisher : Springer Science & Business Media
Page : 750 pages
File Size : 36,87 MB
Release : 2012-12-06
Category : Science
ISBN : 9401116261
To place this book in perspective it is useful for the reader to be aware of the recent history of the topic of underwater sound generation at the ocean surface by natural mechanisms. A meeting in Lerici, Italy in 1987 was convened within the NATO Advanced Research Workshop series, to bring together underwater acousticians and ocean hydrodynamicists to examine various mechanisms which generate sound naturally at the ocean surface. A record of that meeting was published in the NATO scientific publication series in 1988 under the title 'Sea Surface Sound'. That meeting was successful in inspiring and co ordinating both participants and non-attending colleagues to examine some key issues which were raised during the course of presentations and discussions. The understanding among those present was that another meeting should be convened 3 years hence to report and review progress in the subject. Accordingly the second conference was convened in Cambridge in 1990, whose proceedings are presented here. This volume represents a very gratifying increase in only a 3 year interval in our understanding of a number of physical processes which generate sound at the peripheries of oceans. In fact it represents both the acceleration of singular effort as well as the development of interdisciplinary sophistication and co-operation. The enthusiasm, goodwill, and intense scientific curiosity which characterized the Lerici meeting carried through to Cambridge. The collegial atmosphere established by the participants was perfectly timed to foster another major advance in studies of ocean surface sound.
Author : J.A. DeSanto
Publisher : Springer Science & Business Media
Page : 295 pages
File Size : 24,79 MB
Release : 2013-11-11
Category : Science
ISBN : 3642812945
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 : N. G. Pace
Publisher :
Page : 456 pages
File Size : 22,95 MB
Release : 1983
Category : Science
ISBN :
Author : Gerald A. Sandness
Publisher :
Page : 124 pages
File Size : 33,44 MB
Release : 1973
Category : Sound-waves
ISBN :
The Helmholtz integral is often used as the basis for theories on scattering of acoustic signals from rough surfaces, but several approximations must be made to obtain analytical solutions. Many of the mathematical difficulties in analytical computations can be avoided by numerically evaluating the Helmholtz integral. A numerical technique is described which uses measured values of the acoustic pressure of the incident beam, including the side lobes, thereby removing the uncertainty which normally results from approximating the form of the incident beam. A comparison of numerical, analytical, and experimental results is made for the case of a vertically incident beam and a moderately rough surface. The numerical computations are shown to yield values of the scattered pressure which agree well with experimental data for both rough and smooth surfaces. (Modified author abstract).
