Acoustics And Ocean Bottom
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Acoustics And Ocean Bottom
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Author : A. Lara-Sáenz
language : en
Publisher:
Release Date : 1987
Acoustics And Ocean Bottom written by A. Lara-Sáenz and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Hearing categories.
Bottom Interacting Ocean Acoustics
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Author : William A. Kuperman
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-03-13
Bottom Interacting Ocean Acoustics written by William A. Kuperman and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-03-13 with Science categories.
vi These categories seem to represent the basic breakdown by field of present-day research in this area. Though each paper has been classified into one of these categories (for conference organization purpose), many papers overlapped two or three areas. It is also interesting to note that not only are scientific results being communicated, but the latest techniques and the state-of-the-art tools of the trade (existing and in development) are also being presented. The forty-six papers presented at this conference represent the work of seventy scientists working at universities, government laboratories, and industrial laboratories in seven different countries . We would like to thank the contributors for their efforts and especially for their promptness in providing the editors with their final manuscripts. William A. Kuperman Finn B. Jensen La Spezia, Italy July 1980 CONTENTS GEOACOUSTIC PROPERTIES OF MARINE SEDIMENTS Attenuation of Sound in Marine Sediments . • 1 J. M. Hovem Directivity and Radiation Impedance of a Transducer 15 Embedded in a Lossy Medium . •• •••••• G. H. Ziehm Elastic Properties Related to Depth of Burial, Strontium Content and Age, and Diagenetic Stage in Pelagic Carbonate Sediments . . • • . • • • . 41 M. H. Manghnani, S. O. Schianger, and P. D. Milholland Application of Geophysical Methods 'and Equipment to Explore the Sea Bottom . •• •••. • 53 H. F. Weichart The Acoustic Response of Some Gas-Charged Sediments in the Northern Adriatic Sea • • • • . • • • • 73 A.
Interaction Of Sound With The Ocean Bottom
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Author :
language : en
Publisher:
Release Date : 1978
Interaction Of Sound With The Ocean Bottom written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with Ocean bottom categories.
This report documents the results of a three-year study of the interaction of sound with the sea floor. The investigation covered sea floor properties of interest in underwater acoustics, including velocity gradients in the sea floor, density, shear-wave velocities and other properties; research on acoustic propagation models, especially at low frequencies (2 to 200 Hz); and the development of accurate and efficient methods for coupling geoacoustic models to standard propagation models such as ray theory, normal mode theory and P.E. (a numerical method using the Parabolic Equation approximation to the wave equation). During this period numerous reports were distributed to the acoustic community. Various predictions for the surveillance community have been calculated using the geoacoustic and acoustic models, support was provided to others developing models and support was provided on a continuous basis to surveillance programs including the Indian Ocean, MSS, SURTASS, and others. An extensive list of references is included. (Author).
Ocean Seismo Acoustics
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Author : T. Akal
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-03-09
Ocean Seismo Acoustics written by T. Akal and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-03-09 with Science categories.
Seafloor investigation has long been a feature of not only seismology but also of acoustics. Indeed it was acoustics that produced depth sounders, giving us the first capability of producing both global and local maps of the seafloor. Subsequently, better instrumentation and techniques led to a clearer, more quantitative picture of the seabed itself, which stimulated new hypotheses such as seafloor spreading through the availability of more reliable data on sediment thickness over ocean basins and other bottom features. Geologists and geophysicists have used both acoustic and seismic methods to study the seabed by considering the propagation of signals arising from both natural seismic events and man-made impulsive sources. Although significant advances have been made in instrumentation, such as long towed geophysical arrays, ai r guns and ocean bot tom seismometers, the pic ture of the seafloor is still far from complete. Underwater acoustics concerns itself today with the phenomena of propagation and noise at frequencies and ranges that require an understanding of acoustic interaction at both of its boundaries, the sea surface and seafloor, over depths ranging from tens to thousands of meters. Much of the earlier higher frequency (>1 kHz) work included the characterization of the seafloor in regimes of reflection coefficients which were empirically derived from surveys. The results of these studies met with only limited success, confined as they were to those areas where survey data existed and lacking a physical understanding of the processes of reflection and scattering.
Oceanic Acoustic Modelling Sea Bottom
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Author :
language : en
Publisher:
Release Date : 1975
Oceanic Acoustic Modelling Sea Bottom written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with Underwater acoustics categories.
Ocean Acoustics
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Author : J.A. DeSanto
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-11-11
Ocean Acoustics written by J.A. DeSanto and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-11-11 with Science categories.
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.
An Investigation Of Acoustic Interaction With The Ocean Bottom From Experimental Time Series Generated By Explosive Sources
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Author : David Paul Knobles
language : en
Publisher:
Release Date : 1983
An Investigation Of Acoustic Interaction With The Ocean Bottom From Experimental Time Series Generated By Explosive Sources written by David Paul Knobles and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with Ocean bottom categories.
Received time series from explosive sources in an abyssal plains ocean environment are compared to simulated time series calculated by a ray theory model. The comparisons yield information concerning the geoacoustic profile with a single sediment layer. The comparisons are made in various frequency bands to aid in identifying sediment penetrating arrivals by taking advantage of the frequency dependence of the absorption of the sediment. For shorter ranges, the sediment penetrating rays reflect off the basement. Also, as the range decreases, the fraction of received energy due to reflections at the water-sediment interface increases. Discrepancies between the experimental and simulated time series are interpreted in terms of reflections from thin layers within the sediment and scattered basement reflections
Development Of An Acoustic Probe For Detailed Ocean Bottom And Sub Bottom Surveys
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Author : Willard Dow
language : en
Publisher:
Release Date : 1976
Development Of An Acoustic Probe For Detailed Ocean Bottom And Sub Bottom Surveys written by Willard Dow and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with Echo sounding categories.
Results Of A Study Of The Ocean Bottom Interaction Of Underwater Sound
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Author : Kenneth E. Hawker
language : en
Publisher:
Release Date : 1977
Results Of A Study Of The Ocean Bottom Interaction Of Underwater Sound written by Kenneth E. Hawker and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with categories.
This report describes the research of the second year of an on-going program to investigate the broad spectrum of problems associated with the interaction of underwater sound with the ocean bottom. The emphasis is on quantifying the nature of the acoustic bottom interaction problem, isolating key parameters, and developing useful minimal descriptions. This report considers in detail questions in the areas of the sensitivity of bottom reflection loss to variations in subbottom parameters, the sensitivity of propagation loss to changes in bottom reflection loss, and problem associated with range changing bathymetry. Additional topics considered include a review of acoustic methods for obtaining bottom sediment sound velocities, as well as various modeling problems. (Author).
Fundamentals Of Ocean Acoustics
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Author : L. Brekhovskikh
language : en
Publisher: Springer
Release Date : 2014-03-12
Fundamentals Of Ocean Acoustics written by L. Brekhovskikh and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-03-12 with Science categories.
The continents of our planet have already been exploited to a great extent. Therefore man is turning his sight to the vast spaciousness of the ocean whose resources - mineral, biological, energetic, and others - are just beginning to be used. The ocean is being intensively studied. Our notions about the dynam ics of ocean waters and their role in forming the Earth's climate as well as about the structure of the ocean bottom have substantially changed during the last two decades. An outstanding part in this accelerated exploration of the ocean is played by ocean acoustics. Only sound waves can propagate in water over large distances. Practically all kinds of telemetry, communication, location, and re mote sensing of water masses and the ocean bottom use sound waves. Propa gating over thousands of kilometers in the ocean, they bring information on earthquakes, eruptions of volcanoes, and distant storms. Projects using acoustical tomography systems for exploration of the ocean are presently be ing developed. Each of these systems will allow us to determine the three-di mensional structure of water masses in regions as large as millions of square kilometers.