The wind effect on sound propagation over urban areas: Predictions for generic urban sections

M. Hornikx, M. Dohmen, K. Conen, T. van Hooff, B. Blocken

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

Uittreksel

The effect of a downward refracting atmosphere on distant sound propagation over various generic urban areas is predicted. The work uses a two-step approach, by first computing the wind field with computational fluid dynamics (RANS-CFD), and then adopting the mean wind field in a computational acoustics (PSTD-CA) method. These approaches were found to be valid for the studied geometries. For an urban configuration with multiple building blocks, a sound source is located in a street canyon, representing road traffic, and receivers are located at a distance up to 500 m. From results of calculations for various urban configurations, it can be concluded that: the sound levels increase due to the presence of a downward refracting atmosphere, and this effect is larger for higher frequencies; the wind effect ranges from 15 to 23 dB(A); the urban topology close to the source and receiver can largely influence the wind effect; whereas vegetated roofs have the potential to reduce sound levels without wind, in a downward refracting atmosphere the broadband effect is small (<2 dB(A)), however, a potential for reducing noise levels by roofs with low-frequency sound absorption has been identified.

TaalEngels
Pagina's519-531
Aantal pagina's13
TijdschriftBuilding and Environment
Volume144
DOI's
StatusGepubliceerd - 15 okt 2018

Vingerafdruk

sound propagation
Wind effects
urban area
Acoustic waves
prediction
wind field
Roofs
roof
atmosphere
Computational fluid dynamics
recipient
street canyon
road traffic
computational fluid dynamics
Acoustic noise
topology
acoustics
Acoustics
Topology
effect

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    Citeer dit

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    title = "The wind effect on sound propagation over urban areas: Predictions for generic urban sections",
    abstract = "The effect of a downward refracting atmosphere on distant sound propagation over various generic urban areas is predicted. The work uses a two-step approach, by first computing the wind field with computational fluid dynamics (RANS-CFD), and then adopting the mean wind field in a computational acoustics (PSTD-CA) method. These approaches were found to be valid for the studied geometries. For an urban configuration with multiple building blocks, a sound source is located in a street canyon, representing road traffic, and receivers are located at a distance up to 500 m. From results of calculations for various urban configurations, it can be concluded that: the sound levels increase due to the presence of a downward refracting atmosphere, and this effect is larger for higher frequencies; the wind effect ranges from 15 to 23 dB(A); the urban topology close to the source and receiver can largely influence the wind effect; whereas vegetated roofs have the potential to reduce sound levels without wind, in a downward refracting atmosphere the broadband effect is small (<2 dB(A)), however, a potential for reducing noise levels by roofs with low-frequency sound absorption has been identified.",
    keywords = "Downward refraction, Road traffic noise, Urban sound propagation, Vegetated roofs",
    author = "M. Hornikx and M. Dohmen and K. Conen and {van Hooff}, T. and B. Blocken",
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    The wind effect on sound propagation over urban areas : Predictions for generic urban sections. / Hornikx, M.; Dohmen, M.; Conen, K.; van Hooff, T.; Blocken, B.

    In: Building and Environment, Vol. 144, 15.10.2018, blz. 519-531.

    Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

    TY - JOUR

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    AU - Dohmen,M.

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    AU - Blocken,B.

    PY - 2018/10/15

    Y1 - 2018/10/15

    N2 - The effect of a downward refracting atmosphere on distant sound propagation over various generic urban areas is predicted. The work uses a two-step approach, by first computing the wind field with computational fluid dynamics (RANS-CFD), and then adopting the mean wind field in a computational acoustics (PSTD-CA) method. These approaches were found to be valid for the studied geometries. For an urban configuration with multiple building blocks, a sound source is located in a street canyon, representing road traffic, and receivers are located at a distance up to 500 m. From results of calculations for various urban configurations, it can be concluded that: the sound levels increase due to the presence of a downward refracting atmosphere, and this effect is larger for higher frequencies; the wind effect ranges from 15 to 23 dB(A); the urban topology close to the source and receiver can largely influence the wind effect; whereas vegetated roofs have the potential to reduce sound levels without wind, in a downward refracting atmosphere the broadband effect is small (<2 dB(A)), however, a potential for reducing noise levels by roofs with low-frequency sound absorption has been identified.

    AB - The effect of a downward refracting atmosphere on distant sound propagation over various generic urban areas is predicted. The work uses a two-step approach, by first computing the wind field with computational fluid dynamics (RANS-CFD), and then adopting the mean wind field in a computational acoustics (PSTD-CA) method. These approaches were found to be valid for the studied geometries. For an urban configuration with multiple building blocks, a sound source is located in a street canyon, representing road traffic, and receivers are located at a distance up to 500 m. From results of calculations for various urban configurations, it can be concluded that: the sound levels increase due to the presence of a downward refracting atmosphere, and this effect is larger for higher frequencies; the wind effect ranges from 15 to 23 dB(A); the urban topology close to the source and receiver can largely influence the wind effect; whereas vegetated roofs have the potential to reduce sound levels without wind, in a downward refracting atmosphere the broadband effect is small (<2 dB(A)), however, a potential for reducing noise levels by roofs with low-frequency sound absorption has been identified.

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