@article {GUSTAFSON:2024:0736-2935:6667,
title = "Handling of porous road surfaces in traffic noise calculations with Nord2000",
journal = "INTER-NOISE and NOISE-CON Congress and Conference Proceedings",
parent_itemid = "infobike://ince/incecp",
publishercode ="ince",
year = "2024",
volume = "270",
number = "5",
publication date ="2024-10-04T00:00:00",
pages = "6667-6673",
itemtype = "ARTICLE",
issn = "0736-2935",
url = "https://ince.publisher.ingentaconnect.com/content/ince/incecp/2024/00000270/00000005/art00077",
doi = "doi:10.3397/IN_2024_3850",
author = "GUSTAFSON, Andreas and GENELL, Anders",
abstract = "Using porous road surfaces can be an alternative to more traditional noise reduction measures. Two factors contribute to the fact that road noise can get lower than with a conventional dense road surface: the rolling noise emission decreases, and the sound-absorbing road surface can
further reduce the level. In a traffic noise calculation with Nord2000, the influence of the road surface on the sound emission is specified using road surface corrections while the acoustic surface impedance of the road surface determines the ground attenuation. However, due to measurement
technical reasons, porous road surface corrections will include some (undesirable) ground attenuation, leading to that the rolling noise emission might be underestimated. Another problem is that the impedance model in Nord2000 (Delany & Bazley) does not give correct results for porous
road surfaces. These complications have been investigated with Nord2000 calculations using a program code extended to also include an impedance model capable of handling porous road surfaces (Hamet et al). The results have been used to formulate official Swedish recommendations on how porous
road surfaces can be handled in traffic noise investigations with Nord2000.",
}