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High Frequency Acoustic Wave Reflection on the Surf Zone Seafloor

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Increased interest in high frequency sonar operations in surf and nearshore zones requires a knowledge of the acoustic properties of the sea bottom and leads to study high frequency acoustic wave reflection on a recently settled sediment particularly at low grazing insonification angles. In this paper, wide angle specular reflection coefficients obtained by tank experiments are compared with various models. An anomalous postcritical acoustic penetration was observed experimentally. In the models, the sea bottom is successively considered as an attenuating fluid, a viscoelastic solid, and finally a poroviscoelastic medium. Applicability of these theories to sediments in the surf and nearshore zones was verified through the laboratory experiments in the sediment by measuring reflection coefficients at 500 kHz and inverting them into physical properties and sound speed and attenuation, revealing the nature of the material of the bottom and allowing comparison. An assessment of their validity is discussed, concluding that the Biot poroviscoelastic theory is the best to model the non random acoustic and physical properties of the sediment.
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Document Type: Research Article

Publication date: September 1, 1999

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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