Effect of water content on noise attenuation over vegetated roofs: Results from two field studies

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Urban traffic noise is mitigated when propagating over vegetated roofs. It is known from results of laboratory measurements that the sound absorption performance of vegetated roofs is affected by its substrate water content. In a previous study on one extensive green roof, a significant decrease of noise attenuation was found when the substrate water content increased, specifically in the frequency range between 250 Hz and 1250 Hz. This work presents new results from long-lasting in-situ experiments on two extensive vegetated roofs in Eindhoven (Netherlands), together with two different methods for obtaining the results. One scenario involves traffic noise and an artificial noise source is used in the other scenario. The sound pressure level differences over the vegetated roofs, substrate water content and meteorological conditions are measured and collected. Although a descending tendency of noise attenuation with the increase of the substrate water content as in previous research can be confirmed, the extent and frequency of this effect vary significantly between the two vegetated roofs, specifically between 400 Hz and 2000 Hz on the Cascade roof and between 800 Hz and 1000 Hz on the Strijp-S roof.

TaalEngels
Pagina's1-11
Aantal pagina's11
TijdschriftBuilding and Environment
Volume146
DOI's
StatusGepubliceerd - 17 sep 2018

Vingerafdruk

Roofs
Water content
roof
water content
water
substrate
traffic
scenario
Substrates
Acoustic waves
Netherlands
effect
field study
experiment
performance
Experiments

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    title = "Effect of water content on noise attenuation over vegetated roofs: Results from two field studies",
    abstract = "Urban traffic noise is mitigated when propagating over vegetated roofs. It is known from results of laboratory measurements that the sound absorption performance of vegetated roofs is affected by its substrate water content. In a previous study on one extensive green roof, a significant decrease of noise attenuation was found when the substrate water content increased, specifically in the frequency range between 250 Hz and 1250 Hz. This work presents new results from long-lasting in-situ experiments on two extensive vegetated roofs in Eindhoven (Netherlands), together with two different methods for obtaining the results. One scenario involves traffic noise and an artificial noise source is used in the other scenario. The sound pressure level differences over the vegetated roofs, substrate water content and meteorological conditions are measured and collected. Although a descending tendency of noise attenuation with the increase of the substrate water content as in previous research can be confirmed, the extent and frequency of this effect vary significantly between the two vegetated roofs, specifically between 400 Hz and 2000 Hz on the Cascade roof and between 800 Hz and 1000 Hz on the Strijp-S roof.",
    keywords = "Noise mitigation, Traffic noise, Urban sound propagation, Vegetated roof",
    author = "C. Liu and M.C.J. Hornikx",
    year = "2018",
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    Effect of water content on noise attenuation over vegetated roofs : Results from two field studies. / Liu, C.; Hornikx, M.C.J.

    In: Building and Environment, Vol. 146, 17.09.2018, blz. 1-11.

    Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

    TY - JOUR

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    AU - Liu,C.

    AU - Hornikx,M.C.J.

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    Y1 - 2018/9/17

    N2 - Urban traffic noise is mitigated when propagating over vegetated roofs. It is known from results of laboratory measurements that the sound absorption performance of vegetated roofs is affected by its substrate water content. In a previous study on one extensive green roof, a significant decrease of noise attenuation was found when the substrate water content increased, specifically in the frequency range between 250 Hz and 1250 Hz. This work presents new results from long-lasting in-situ experiments on two extensive vegetated roofs in Eindhoven (Netherlands), together with two different methods for obtaining the results. One scenario involves traffic noise and an artificial noise source is used in the other scenario. The sound pressure level differences over the vegetated roofs, substrate water content and meteorological conditions are measured and collected. Although a descending tendency of noise attenuation with the increase of the substrate water content as in previous research can be confirmed, the extent and frequency of this effect vary significantly between the two vegetated roofs, specifically between 400 Hz and 2000 Hz on the Cascade roof and between 800 Hz and 1000 Hz on the Strijp-S roof.

    AB - Urban traffic noise is mitigated when propagating over vegetated roofs. It is known from results of laboratory measurements that the sound absorption performance of vegetated roofs is affected by its substrate water content. In a previous study on one extensive green roof, a significant decrease of noise attenuation was found when the substrate water content increased, specifically in the frequency range between 250 Hz and 1250 Hz. This work presents new results from long-lasting in-situ experiments on two extensive vegetated roofs in Eindhoven (Netherlands), together with two different methods for obtaining the results. One scenario involves traffic noise and an artificial noise source is used in the other scenario. The sound pressure level differences over the vegetated roofs, substrate water content and meteorological conditions are measured and collected. Although a descending tendency of noise attenuation with the increase of the substrate water content as in previous research can be confirmed, the extent and frequency of this effect vary significantly between the two vegetated roofs, specifically between 400 Hz and 2000 Hz on the Cascade roof and between 800 Hz and 1000 Hz on the Strijp-S roof.

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    KW - Traffic noise

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