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Sound propagation around off-shore wind turbines
KTH, Superseded Departments, Civil and Architectural Engineering.
2003 (English)Licentiate thesis, monograph (Other scientific)
Abstract [en]

Low-frequency, long-range sound propagation over a seasurface has been calculated using a wide-angel Cranck-NicholsonParabolic Equation method. The model is developed toinvestigate noise from off-shore wind turbines. Thecalculations are made using normal meteorological conditions ofthe Baltic Sea. Special consideration has been made to a windphenomenon called low level jet with strong winds on rather lowaltitude.

The effects of water waves on sound propagation have beenincorporated in the ground boundary condition using a bossmodel. This way of including roughness in sound propagationmodels is valid for water wave heights that are small comparedto the wave length of the sound. Nevertheless, since only lowfrequency sound is considered, waves up to the mean wave heightof the Baltic Sea can be included in this manner.

The calculation model has been tested against benchmarkcases and agrees well with measurements. The calculations showthat channelling of sound occurs at downwind conditions andthat the sound propagation tends towards cylindrical spreading.The effects of the water waves are found to be fairlysmall.

Keywords:wind turbine noise, off-shore wind power,long-range sound propagation, parabolic equation, scattering,water waves

Place, publisher, year, edition, pages
Stockholm: Byggvetenskap , 2003. , 87 p.
Meddelande. Inst. för byggnadsteknik, ISSN 0346-5918 ; 192
Keyword [en]
wind turbine noise, off-shore wind powe, long-rage sound propagation, parabolic equation, scattering, water waves
National Category
Building Technologies
URN: urn:nbn:se:kth:diva-1580OAI: diva2:7506
QC 20110617Available from: 2003-08-04 Created: 2003-08-04 Last updated: 2011-06-16Bibliographically approved

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