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Seabed Geo Acoustic Parameters And Scattering Model From Low Frequency Measurements In Shallow Water
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Book Synopsis Seabed Geo-Acoustic Parameters and Scattering Model from Low Frequency Measurements in Shallow Water by :
Download or read book Seabed Geo-Acoustic Parameters and Scattering Model from Low Frequency Measurements in Shallow Water written by and published by . This book was released on 2009 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The long-term goals of this work are: to develop a practical seabed geo-acoustic model and a practical scattering model for predicting sound transmission, reverberation and their spatial coherence in shallow water (SW).
Book Synopsis Fundamentals of Shallow Water Acoustics by : Boris Katsnelson
Download or read book Fundamentals of Shallow Water Acoustics written by Boris Katsnelson and published by Springer Science & Business Media. This book was released on 2012-02-22 with total page 549 pages. Available in PDF, EPUB and Kindle. Book excerpt: Shallow water acoustics (SWA), the study of how low and medium frequency sound propagates and scatters on the continental shelves of the worlds oceans, has both technical interest and a large number of practical applications. Technically, shallow water poses an interesting medium for the study of acoustic scattering, inverse theory, and propagation physics in a complicated oceanic waveguide. Practically, shallow water acoustics has interest for geophysical exploration, marine mammal studies, and naval applications. Additionally, one notes the very interdisciplinary nature of shallow water acoustics, including acoustical physics, physical oceanography, marine geology, and marine biology. In this specialized volume the authors, all of whom have extensive at-sea experience in US and Russian research efforts, have tried to summarize the main experimental, theoretical, and computational results in shallow water acoustics, with an emphasis on providing physical insight into the topics presented.
Download or read book Ocean Seismo-Acoustics written by T. Akal and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 898 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Acoustic Sensing Techniques for the Shallow Water Environment by : Andrea Caiti
Download or read book Acoustic Sensing Techniques for the Shallow Water Environment written by Andrea Caiti and published by Springer Science & Business Media. This book was released on 2006-09-21 with total page 331 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains the collection of papers from the second workshop on Experimental Acoustic Inversion Techniques for Exploration of the Shallow Water Environment. Acoustic techniques provide the most effective means for remote sensing of ocean and sea floor processes, and for probing the structure beneath the sea floor. No other energy propagates as efficiently in the ocean: radio waves and visible light are severely limited in range because the ocean is a highly conductive medium. However, sound from breaking waves and coastal shipping can be heard throughout the ocean, and marine mammals communicate acoustically over basin scale distances. The papers in this book indicate a high level of research interest that has generated significant progress in development and application of experimental acoustic inversion techniques. The applications span a broad scope in geosciences, from geophysical, biological and even geochemical research. The list includes: estimation of geotechnical properties of sea bed materials; navigation and mapping of the sea floor; fisheries, aquaculture and sea bed habitat assessment; monitoring of marine mammals; sediment transport; and investigation of natural geohazards in marine sediments. Audience This book is primarily intended for physicists and engineers working in underwater acoustics and oceanic engineering. It will also be of interest to marine biologists, geophysicists and oceanographers as potential users of the methodologies and techniques described in the book contributions.
Book Synopsis Bottom-Interacting Ocean Acoustics by : William A. Kuperman
Download or read book Bottom-Interacting Ocean Acoustics written by William A. Kuperman and published by Springer Science & Business Media. This book was released on 2013-03-13 with total page 700 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis The Role of the Seabed in Low-Frequency Shallow-Water Acoustic Propagation: Examples from Measurements and Modelling by : H. B. Ali
Download or read book The Role of the Seabed in Low-Frequency Shallow-Water Acoustic Propagation: Examples from Measurements and Modelling written by H. B. Ali and published by . This book was released on 1990 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: Except in rather unusual circumstances, interaction with the seafloor is an inevitable accompaniment to the propagation of sound in the sea. In shallow water, especially at very low and low frequencies, the bottom interaction plays a significant, if not deterministic, role in acoustic propagation. From the results of numerous experiments and numerical modelling in recent years, it is evident that one must account for the geoacoustic properties in more than an ad hoc fashion. Some of the relevant research efforts, particularly those from the ongoing research program at the NOARL, are described in this paper. The results of the NOARL measurements in several geographical areas, coupled with numerical modelling, are used to demonstrate the significance of energy partitioning between waterborne and bottom paths, the role of Scholte interface waves, the efficacy and limitations of selected numerical models, and the significance of ambient noise. Keywords: Underwater sound transmission; Underwater acoustics interactions. (edc).
Book Synopsis Measurement and Modeling of Low Frequency Acoustic Wave Propagation and Scattering in Shallow Water with Comprehensive Subbottom Structure Measurements by :
Download or read book Measurement and Modeling of Low Frequency Acoustic Wave Propagation and Scattering in Shallow Water with Comprehensive Subbottom Structure Measurements written by and published by . This book was released on 1996 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: A high resolution acoustic crosswell tomography technique was developed for accurate measurements of variabilities of density, velocity, shear strength and permeability within the sediments. An analytical expression for the three dimensional wave number spectra of these sediment properties has been obtained. Acoustics scattering from sediment volume has been obtained as a function of the three dimensional spectra of velocity and density variabilities. Work continues to quantify the relation between the variabilities of sediment properties and acoustic bottom scattering. A method to measure the ocean wave directional spectra using a single buried ocean bottom seismometer and a pressure senser has been developed and sea tested successfully.
Author :Michael I. Taroudakis Publisher :Springer Science & Business Media ISBN 13 :1475735200 Total Pages :221 pages Book Rating :4.4/5 (757 download)
Book Synopsis Inverse Problems in Underwater Acoustics by : Michael I. Taroudakis
Download or read book Inverse Problems in Underwater Acoustics written by Michael I. Taroudakis and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 221 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume provides recent and useful results for bottom recognition, inverse scattering in acoustic wave guides and ocean acoustic tomography, plus a discussion of some of the new algorithms, such as those related to matched-field processing, which have recently been used for inverting experimental data.
Book Synopsis Acoustics and the Sea-bed by : N. G. Pace
Download or read book Acoustics and the Sea-bed written by N. G. Pace and published by . This book was released on 1983 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Applied Underwater Acoustics by : Thomas Neighbors
Download or read book Applied Underwater Acoustics written by Thomas Neighbors and published by Elsevier. This book was released on 2017-01-19 with total page 982 pages. Available in PDF, EPUB and Kindle. Book excerpt: Applied Underwater Acoustics meets the needs of scientists and engineers working in underwater acoustics and graduate students solving problems in, and preparing theses on, topics in underwater acoustics. The book is structured to provide the basis for rapidly assimilating the essential underwater acoustic knowledge base for practical application to daily research and analysis. Each chapter of the book is self-supporting and focuses on a single topic and its relation to underwater acoustics. The chapters start with a brief description of the topic’s physical background, necessary definitions, and a short description of the applications, along with a roadmap to the chapter. The subtopics covered within individual subchapters include most frequently used equations that describe the topic. Equations are not derived, rather, assumptions behind equations and limitations on the applications of each equation are emphasized. Figures, tables, and illustrations related to the sub-topic are presented in an easy-to-use manner, and examples on the use of the equations, including appropriate figures and tables are also included. Provides a complete and up-to-date treatment of all major subjects of underwater acoustics Presents chapters written by recognized experts in their individual field Covers the fundamental knowledge scientists and engineers need to solve problems in underwater acoustics Illuminates, in shorter sub-chapters, the modern applications of underwater acoustics that are described in worked examples Demands no prior knowledge of underwater acoustics, and the physical principles and mathematics are designed to be readily understood by scientists, engineers, and graduate students of underwater acoustics Includes a comprehensive list of literature references for each chapter
Book Synopsis Geoacoustic Models of the Sea Floor by : E. L. Hamilton
Download or read book Geoacoustic Models of the Sea Floor written by E. L. Hamilton and published by . This book was released on 1965 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: The information and technology necessary to derive a valid geological-geophysical-acoustic model of the sea floor are presented. Two contrasting models are detailed and discussed: one in the Bering Sea which has a shallow-water, high-velocity, hard-sand bottom; and the Mohole (Guadalupe Site) model which has a deep-water, low-velocity, soft-clay bottom. Other models are to be reported in a continuing series. (Author).
Book Synopsis Geo-acoustic Stratification Deep in the Sea Bed from Ambient Noise in Shallow Water by : M. Buckingham
Download or read book Geo-acoustic Stratification Deep in the Sea Bed from Ambient Noise in Shallow Water written by M. Buckingham and published by . This book was released on 1997 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: The long-term objective is to develop a reliable ambient-noise inversion technique for obtaining the geo-acoustic parameters, including the stratification, of the sea bed from measurements of the broadband vertical coherence of the noise in shallow water. The method would be implemented in a free-floating instrument, self navigated with GPS, and consisting of a pair of vertically aligned hydrophones, to provide a cost-effective sensor system for collecting the required noise data over extensive areas of shallow water. The resultant bottom information would provide essential input to navy propagation loss models.
Download or read book Physics Briefs written by and published by . This book was released on 1992 with total page 820 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Spatial Coherence in a Shallow Water Waveguide by : Jie Yang
Download or read book Spatial Coherence in a Shallow Water Waveguide written by Jie Yang and published by . This book was released on 2007 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: In shallow water environments, sound propagation experiences multiple interactions with the surface/bottom interfaces, with hydrodynamic disturbances such as internal waves, and with tides and fronts. It is thus very difficult to make satisfactory predictions of sound propagation in shallow water. Given that many of the ocean characteristics can be modeled as stochastic processes, the statistical measure, spatial coherence, is consequently an important quantity. Spatial coherence provides valuable information for array performance predictions. However, for the case of long-range, low frequency propagation, studies of spatial coherence influenced by various environmental parameters are limited insofar as having the appropriate environmental data with which to model and interpret the results.
Book Synopsis Matched Field Processing Based Geo-acoustic Inversion in Shallow Water by : Lin Wan
Download or read book Matched Field Processing Based Geo-acoustic Inversion in Shallow Water written by Lin Wan and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Shallow water acoustics is one of the most challenging areas of underwater acoustics; it deals with strong sea bottom and surface interactions, multipath propagation, and it often involves complex variability in the water column. The sea bottom is the dominant environmental influence in shallow water. An accurate solution to the Helmholtz equation in a shallow water waveguide requires accurate seabed acoustic parameters (including seabed sound speed and attenuation) to define the bottom boundary condition. Direct measurement of these bottom acoustic parameters is excessively time consuming, expensive, and spatially limited. Thus, inverted geo-acoustic parameters from acoustic field measurements are desirable.
Book Synopsis The Journal of the Acoustical Society of America by : Acoustical Society of America
Download or read book The Journal of the Acoustical Society of America written by Acoustical Society of America and published by . This book was released on 2007 with total page 1552 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Selected Papers on Ocean-Seismo Acoustics Low-Frequency Underwater Acoustics Based on the SACLANTCEN Contributions to a Symposium Held by SACLANTCEN on 10-14 June 1985 by :
Download or read book Selected Papers on Ocean-Seismo Acoustics Low-Frequency Underwater Acoustics Based on the SACLANTCEN Contributions to a Symposium Held by SACLANTCEN on 10-14 June 1985 written by and published by . This book was released on 1986 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt: CONTENTS: Time dependence of infrasonic ambient seafloor noise on a continental shelf; The use of Love waves to determine the geoacoustic properties of marine sediments; Medium induced low frequency fluctuations in acoustic transmission loss; Directional measurements of low frequency acoustic backscattering from the seafloor; Shear properties of ocean sediments determined from numerical modelling of Scholte wave data; Evaluation of low frequency bottom backscattering strength vs grazing angle by means of multiple beamforming; Spatial variability of surficial shallow water sediment geoacoustic properties; Evaluation of experimental techniques for determining the plane wave reflection coefficient at the sea floor; Interface wave studies on the Ligurian shelf using an OBS array: experimental results and propagation models; and Low frequency anomalies in the reflection behaviour of marine sediments.
