@article {Van der Eerden:2019:0736-2935:399,
title = "The barrier effect of roadside diffracting elements for standard noise calculations",
journal = "INTER-NOISE and NOISE-CON Congress and Conference Proceedings",
parent_itemid = "infobike://ince/incecp",
publishercode ="ince",
year = "2019",
volume = "259",
number = "9",
publication date ="2019-09-30T00:00:00",
pages = "399-406",
itemtype = "ARTICLE",
issn = "0736-2935",
url = "https://ince.publisher.ingentaconnect.com/content/ince/incecp/2019/00000259/00000009/art00063",
author = "Van der Eerden, Frits and Brouns, Eef and Eisses, Arno and Van Vliet, WillemJan",
abstract = "By using elements with quarter-wavelength resonators of different depths alongside a road, noise can be diffracted upwards to create a zone of noise reduction behind these elements. Measurements at a short distance, up to 15 meters, have proven that a noise reduction up to 4 dB(A) can
be achieved. The noise reduction at long distance, up to 600 meters, was calculated numerically by combining a finite element model (FEM) and a parabolic equation model (PE), taking a downwind condition into account. These results are used to design an engineering approach that represents
a barrier effect. This approach can be implemented in the standard noise calculation models, such as the Dutch national model or the ISO 9613-2 standard. The steps that are used for this engineering approach are explained. This involves the measurement of the intrinsic characteristics of the
diffracting elements and empirical relations that use these characteristics.",
}