Urban background noise mapping : the general model

W. Wei, D. Botteldooren, T. Van Renterghem, M.C.J. Hornikx, J. Forssén, E. Salomons, M. Ogren

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Abstract

Surveys show that inhabitants of dwellings exposed to high noise levels benefit from having access to a quiet side. However, current practice in noise prediction often underestimates the noise levels at a shielded façade. Multiple reflections between façades in street canyons and inner yards are commonly neglected and façades are approximated as perfectly flat surfaces yielding only specular reflection. In addition, sources at distances much larger than normally taken into account in noise maps might still contribute significantly. Since one of the main reasons for this is computational burden, an efficient engineering model for the diffraction of the sound over the roof tops is proposed, which considers multiple reflections, variation in building height, canyon width, façade roughness and different roof shapes. The model is fitted on an extensive set of full-wave numerical calculations of canyon-to-canyon sound propagation with configurations matching the distribution of streets and building geometries in a typical historically grown European city. This model allows calculating the background noise in the shielded areas of a city, which could then efficiently be used to improve existing noise mapping calculations. The model was validated by comparison to long-term measurements at 9 building façades whereof 3 were at inner yards in the city of Ghent, Belgium. At shielded façades, a strong improvement in prediction accuracy is obtained.
Original languageEnglish
Pages (from-to)1098-1111
Number of pages14
JournalActa Acustica united with Acustica
Volume100
Issue number6
DOIs
Publication statusPublished - 2014

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canyons
background noise
streets
roofs
inhabitants
Belgium
noise prediction
specular reflection
sound propagation
flat surfaces
roughness
engineering
acoustics
geometry
configurations
predictions
diffraction
Sound
Prediction

Cite this

Wei, W., Botteldooren, D., Van Renterghem, T., Hornikx, M. C. J., Forssén, J., Salomons, E., & Ogren, M. (2014). Urban background noise mapping : the general model. Acta Acustica united with Acustica, 100(6), 1098-1111. https://doi.org/10.3813/AAA.918789
Wei, W. ; Botteldooren, D. ; Van Renterghem, T. ; Hornikx, M.C.J. ; Forssén, J. ; Salomons, E. ; Ogren, M. / Urban background noise mapping : the general model. In: Acta Acustica united with Acustica. 2014 ; Vol. 100, No. 6. pp. 1098-1111.
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Wei, W, Botteldooren, D, Van Renterghem, T, Hornikx, MCJ, Forssén, J, Salomons, E & Ogren, M 2014, 'Urban background noise mapping : the general model', Acta Acustica united with Acustica, vol. 100, no. 6, pp. 1098-1111. https://doi.org/10.3813/AAA.918789

Urban background noise mapping : the general model. / Wei, W.; Botteldooren, D.; Van Renterghem, T.; Hornikx, M.C.J.; Forssén, J.; Salomons, E.; Ogren, M.

In: Acta Acustica united with Acustica, Vol. 100, No. 6, 2014, p. 1098-1111.

Research output: Contribution to journalArticleAcademicpeer-review

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AU - Wei, W.

AU - Botteldooren, D.

AU - Van Renterghem, T.

AU - Hornikx, M.C.J.

AU - Forssén, J.

AU - Salomons, E.

AU - Ogren, M.

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AB - Surveys show that inhabitants of dwellings exposed to high noise levels benefit from having access to a quiet side. However, current practice in noise prediction often underestimates the noise levels at a shielded façade. Multiple reflections between façades in street canyons and inner yards are commonly neglected and façades are approximated as perfectly flat surfaces yielding only specular reflection. In addition, sources at distances much larger than normally taken into account in noise maps might still contribute significantly. Since one of the main reasons for this is computational burden, an efficient engineering model for the diffraction of the sound over the roof tops is proposed, which considers multiple reflections, variation in building height, canyon width, façade roughness and different roof shapes. The model is fitted on an extensive set of full-wave numerical calculations of canyon-to-canyon sound propagation with configurations matching the distribution of streets and building geometries in a typical historically grown European city. This model allows calculating the background noise in the shielded areas of a city, which could then efficiently be used to improve existing noise mapping calculations. The model was validated by comparison to long-term measurements at 9 building façades whereof 3 were at inner yards in the city of Ghent, Belgium. At shielded façades, a strong improvement in prediction accuracy is obtained.

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Wei W, Botteldooren D, Van Renterghem T, Hornikx MCJ, Forssén J, Salomons E et al. Urban background noise mapping : the general model. Acta Acustica united with Acustica. 2014;100(6):1098-1111. https://doi.org/10.3813/AAA.918789