UID:
almafu_9959691891502883
Format:
1 online resource (xxi, 420 pages) :
,
digital, PDF file(s).
ISBN:
1-316-68322-2
,
1-316-68484-9
,
1-316-68511-X
,
1-5231-0576-3
,
1-316-68538-1
,
1-316-68565-9
,
1-316-68646-9
,
1-139-68041-2
Content:
The ocean is opaque to electromagnetic radiation and transparent to low frequency sound, so acoustical methodologies are an important tool for sensing the undersea world. Stochastic sound-speed fluctuations in the ocean, such as those caused by internal waves, result in a progressive randomisation of acoustic signals as they traverse the ocean environment. This signal randomisation imposes a limit to the effectiveness of ocean acoustic remote sensing, navigation and communication. Sound Propagation through the Stochastic Ocean provides a comprehensive treatment of developments in the field of statistical ocean acoustics over the last 35 years. This will be of fundamental interest to oceanographers, marine biologists, geophysicists, engineers, applied mathematicians, and physicists. Key discoveries in topics such as internal waves, ray chaos, Feynman path integrals, and mode transport theory are addressed with illustrations from ocean observations. The topics are presented at an approachable level for advanced students and seasoned researchers alike.
Note:
Title from publisher's bibliographic system (viewed on 06 Jun 2016).
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Cover; Half-title; Title page; Copyright information; Dedication; Table of contents; Foreword; Preface; Notation; PART I Introduction and Prerequisites; 1 Sound Propagation through the Stochastic Ocean; 1.1 Introduction and Historical Background; 1.1.1 Ocean Dynamics and Fluctuations; 1.1.2 Theory of Sound Propagation; 1.2 Three Decades of Development: Observations; 1.2.1 Deep Water; 1.2.2 Emergence of Shallow-Water Acoustics; 1.2.3 Ocean Sound-Speed Spectrum; 1.3 Three Decades of Development: Theory; 1.3.1 Ray Theory; 1.3.2 Weak Fluctuation Theory; 1.3.3 Path Integral Theory
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1.3.4 Coupled-Mode Transport Theory1.4 Where We Stand; 1.5 Utilizing This Book; 2 Acoustical Prerequisites; 2.1 Introduction; 2.2 Fundamental Equations of Hydrodynamics; 2.2.1 Parabolic Wave Equation; 2.3 Character of the Oceanic Acoustic Waveguide; 2.3.1 Canonical Sound-Speed Profiles; 2.3.2 Sound-Speed Fluctuations due to Internal Waves; 2.3.3 Example Profiles; 2.3.4 Attenuation of Sound; 2.4 Rays; 2.4.1 Physical Picture and Basic Equations; 2.4.2 Ray Theory: Asymptotic Analysis; 2.4.3 Ray Amplitude and Stability; 2.4.4 Ray Chaos: Introduction; 2.4.5 Ehrenfest Theorem
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2.4.6 Rays in a Range-Independent Ocean2.5 Fresnel Zones and Ray Tubes; 2.6 Born and Rytov Approximations; 2.6.1 Relation to Amplitude and Phase; 2.6.2 Relationship between Born and Rytov Solutions; 2.7 Path Integrals; 2.7.1 Variational Approach to Ray Propagation; 2.7.2 Path Integrals: A Qualitative Discussion; 2.7.3 Formulation of the Path Integral; 2.7.4 Solution of the Parabolic Equation as a Path Integral; 2.8 Normal Modes; 2.8.1 Coupled Mode Equations; 2.8.2 Adiabatic Theory; 2.8.3 Vertical Modes, Horizontal Rays; 2.8.4 Modes in a Range-independent Ocean
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Appendix A Green's Functions and the Fresnel ZoneAppendix B WKB Modes; 3 Stochastic Ocean Internal Waves; 3.1 Introduction; 3.2 Fundamental Equations of Hydrodynamics; 3.2.1 Ray Theory: Local Plane Waves; 3.2.2 Modal Solutions; 3.2.3 WKB Analysis; 3.3 Garrett-Munk Internal-Wave Model; 3.3.1 Other Useful Forms of the GM Spectrum; 3.3.2 Maximum Internal-Wave Mode Number; 3.3.3 Internal-Wave Correlation Scales; 3.3.4 Modifications to GM; 3.4 Observations; 3.4.1 Deep Ocean: Mid-Latitude; 3.4.2 Seamounts, Slopes, and Canyons; 3.4.3 Continental Shelves; 3.4.4 Arctic and High Latitude
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3.4.5 Equator3.5 Other Sources of Stochastic Sound-Speed Structure; 3.5.1 Spice; 3.5.2 Vortical Motions; Appendix A An Internal-Wave Model with an Exponential Correlation Function; Appendix B Monte Carlo Simulation; 4 Introduction to Acoustic Fluctuations; 4.1 Origin of Phase and Amplitude Fluctuations; 4.1.1 Weak Fluctuations; 4.1.2 Strong Fluctuations: Wave Front Folding and Interference; 4.1.3 Ray Micro-multipath; 4.1.4 A Simple Model of Microray Interference; 4.1.5 Modal-multipath: Mode Coupling ; 4.2 Acoustic Sensitivity to Internal Waves
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4.2.1 Ray/Internal Wave Resonance and Diffraction
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English
Additional Edition:
ISBN 1-107-07234-4
Language:
English
URL:
https://doi.org/10.1017/CBO9781139680417
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