Effects of source side roughness on the acoustical performance of a traffic noise berm

Hill, Toby; Taherzadeh, Shahram; Bashir, Imran and Attenborough, Keith (2011). Effects of source side roughness on the acoustical performance of a traffic noise berm. In: Forum Acusticum 2011, 26 Jun - 01 Jul 2011, Aalborg, Denmark.

Abstract

Surface roughness introduced on to horizontal ground between a noise source and receiver has previously been demonstrated to provide additional attenuation for sound near grazing incidence. Roughness-enhanced ground effect has been shown to depend on the relative source-receiver geometry. In most studies of the effects of surface roughness there has been line of site between source and receiver [see for example “Diffraction assisted ground effect” Bashir, Attenborough, Hill and Taherzadeh, Proc. 2010 ASA, Cancun] whereas for potential applications this may not be the case. Numerical calculations and data indicate the benefits of applying specific surface roughness profiles to large-scale acoustic obstructions such as an earth berm. Boundary element calculations have been used to investigate the attenuation of sound by the scattering of surface/creeping waves from surface roughness. The influence of different roughness cross-sections and distributions on the attenuation of noise from standard road traffic sources are discussed [work supported by European Community FP7 project number 234306].

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