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Urban background noise mapping: The general model
Ghent University.
Ghent University.
Ghent University.
Chalmers Tekniska Högskola.ORCID-id: 0000-0002-8343-6613
Vise andre og tillknytning
2014 (engelsk)Inngår i: Acta Acoustica united with Acustica, ISSN 1610-1928, E-ISSN 1861-9959, Vol. 100, nr 6, s. 1098-1111Artikkel i tidsskrift (Fagfellevurdert) Published
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Text
Abstract [en]

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.

sted, utgiver, år, opplag, sider
2014. Vol. 100, nr 6, s. 1098-1111
Emneord [en]
Noise, Dwelling, Noise level, Mathematical model, Prediction, Reflection, Surface
HSV kategori
Forskningsprogram
10 Road: Transport, society, policy and planning, 15 Road: Environment
Identifikatorer
URN: urn:nbn:se:vti:diva-9364DOI: 10.3813/AAA.918789ISI: 000343742800010Scopus ID: 2-s2.0-84908132048OAI: oai:DiVA.org:vti-9364DiVA, id: diva2:930678
Tilgjengelig fra: 2016-05-25 Laget: 2016-03-02 Sist oppdatert: 2017-11-30bibliografisk kontrollert

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Hornikx, Maarten C JForssén, JensÖgren, Mikael

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