Sound Field Coherence Behind a Low Barrier in a Turbulent Atmosphere without the Presence of a Ground Surface
The turbulence in the atmospheric boundary layer causes the sound propagation to take place in a random medium. The influence on the sound can be strong especially in acoustic shadow regions, which can be caused by refraction, ground attenuation or geometry, e.g. by a noise barrier. Here, situations with a noise barrier that is low in comparison with its distance to source and receiver are studied in two dimensions. Previous studies on turbulence effects have been made on the increased sound level in shadow regions as well as on the reduced coherence in line-of-sight situations and in shadow regions caused by refraction. Here, the main focus is instead on the reduced coherence of the sound field in the shadow region behind a noise barrier. Analytical as well as numerical results are presented whose implications are relevant for future studies on the sound level increase in shadow regions when the receiver is located above a ground surface. As one of the results it is concluded that the turbulence causes a larger coherence loss for screened cases than for line-of-sight cases.
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Document Type: Research Article
Publication date: September 1, 2010
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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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