Urban background noise mapping: The multiple-reflection correction term
Journal article, 2014

Mapping of road traffic noise in urban areas according to standardized engineering calculation methods systematically results in an underestimation of noise levels at areas shielded from direct exposure to noise, such as inner yards. In most engineering methods, road traffic lanes are represented by point sources and noise levels are computed utilizing point-to-point propagation paths. For a better prediction of noise levels in shielded urban areas, an extension of engineering methods by an attenuation term Acan has been proposed, including multiple reflections of the urban environment both in the source and in the receiver area. The present work has two main contributions for the ease of computing Acan. Firstly, it is shown by numerical calculations that Acan may be divided into independent source and receiver environment terms, As and Ar. Based on an equivalent free field analogy, the distance dependence of these terms may moreover be expressed analytically. Secondly, an analytical expression is proposed to compute As and Ar for 3D configurations from using 2D configurations only. The expression includes dependence of the street width-to-height ratio, the difference in building heights and the percentage of facade openings in the horizontal plane. For the expression to be valid, the source should be separated from the receiver environment by at least four times the street width. © S. Hirzel Verlag EAA.

Author

Maarten Hornikx

Technische Universiteit Eindhoven

Jens Forssén

Chalmers, Civil and Environmental Engineering, Applied Acoustics, Vibroacoustics

D. Botteldooren

Ghent university

T. Van Renterghem

Ghent university

W. Wei

Ghent university

M. Ögren

The Swedish National Road and Transport Research Institute (VTI)

Erik Salomons

Netherlands Organisation for Applied Scientific Research (TNO)

Acta Acustica united with Acustica

1610-1928 (ISSN)

Vol. 100 2 293-305

Areas of Advance

Building Futures (2010-2018)

Subject Categories

Other Engineering and Technologies not elsewhere specified

Other Civil Engineering

DOI

10.3813/AAA.918709

More information

Latest update

11/21/2018