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The Role of Gas Bubbles and Surface-Active Substances on Noise Generation by Rain Drops

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The paper presents some of the aspects of the influence of a subsurface bubble layer on the acoustical signals accompanying an act of water drops falling onto water surface. Laboratory drop-tests were conducted using aerated and degassed seawater and freshwater in the presence of surface-active substances. Comparisons between different data series imply that initial drop impact pressures and new bubble generation rates are influenced mainly by the existence of a subsurface bubble layer and are less sensitive to changes in surface tension. The statistical relationships between noise spectra created by drop splashes, average bubble creation rates and drop parameters under different conditions are presented. The results clearly indicated that the laboratory-observed changing of noise intensity due to presence of gas bubbles in sea water should be taken into account when interpreting rainfall noise level at higher wind conditions in the sea.
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Document Type: Research Article

Publication date: 01 September 2002

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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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