Downward Refraction due to Low Level Jet
A low level jet is a relatively high wind at a relatively low altitude. It causes a near-ground sound channel. Making use of eigenray tracing based on the Barton equation, downwind refraction is studied. We assume an incoherent summation of the direct and reflected waves which is valid at relatively large distances and relatively strong turbulence in the atmosphere. Dozens of ground reflected rays transform the wave spherical spreading into cylindrical wave spreading. Measurements of wind turbine noise confirm this effect.
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Document Type: Research Article
Publication date: 01 July 2016
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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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