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Equivalent Input Backscattering Strength Model for a Layered Seafloor with Parameters continuously Varying with Depth

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A backscattering strength model for layered seafloor was recently presented: the Equivalent Input Backscattering Strength (EIBS) model (JASA, 109, pp.122-132, 2001). It is based on a combination of classical models of local backscattering strength and propagation inside a stack of homogeneous fluid layers. In the present work, we propose to extend the EIBS model to the case of stratified seafloors with acoustical parameters continuously varying with depth. The wave equation is solve d numerically in each layer to produce the transfer coefficients needed in the EIBS model; the numerical approach allows the method to be usable for any variation with depth. We discuss the effect of parameter variations upon the individual layer backscattering strength and upon the transfer function behaviour, in particular the masking effect of a strong gradient upon the echo by buried scatterers at oblique incidence. Numerical results obtained from seafloor simulations are presented and considerations about real cases are discussed.
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Document Type: Research Article

Publication date: 2002-09-01

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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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