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

机译：含水量对植被屋顶噪声衰减的影响：两项现场研究的结果

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摘要

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.
机译：在植物屋顶上传播时，可减轻城市交通噪音。从实验室测量结果得知，植物屋顶的吸声性能受其基质含水量的影响。在先前对一个宽阔的绿色屋顶进行的研究中，当基材含水量增加时，特别是在250 Hz和1250 Hz之间的频率范围内，发现噪声衰减显着降低。这项工作提出了在荷兰埃因霍温的两个大型植被屋顶上进行的长期原位实验的新结果，以及两种获得结果的方法。一种情况涉及交通噪声，另一种情况下使用人工噪声源。测量并收集植被屋顶上的声压级差，基质含水量和气象条件。尽管可以像以前的研究一样证实随着基底含水量的增加噪声衰减的下降趋势，但是这种影响的程度和频率在两个植被屋顶之间，尤其是在Cascade屋顶上的400 Hz至2000 Hz之间，变化很大。在Strijp-S屋顶上的800 Hz至1000 Hz之间。

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