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Issue 10, 2011
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Sampling approaches to predict urban street noise levels using fixed and temporary microphones

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Abstract

Requirements for static (prediction of Lden and diurnal averaged noise pattern) and dynamic (prediction of 15 min and 60 min evolution of LAeq and statistical levels LA90,LA50 and LA10) noise level monitoring are investigated in this paper. Noise levels are measured for 72 consecutive days at 5 neighboring streets in an inner-city noise measurement network in Gent, Flanders, Belgium. We present a method to make predictions based on a fixed monitoring station, combined with short-term sampling at temporary stations. It is shown that relying on a fixed station improves the estimation of Lden at other locations, and allows for the reduction of the number of samples needed and their duration; Lden is estimated with an error that does not exceed 1.5 dB(A) to 3.4 dB(A) according to the location, for 90% of the 3 × 15 min samples. Also the diurnal averaged noise pattern can be estimated with a good accuracy in this way. It was shown that there is an optimal location for the fixed station which can be found by short-term measurements only. Short-term level predictions were shown to be more difficult; 7 day samples were needed to build models able to estimate the evolution of LAeq,60min with a RMSE ranging between 1.4 dB(A) and 3.7 dB(A). These higher values can be explained by the very pronounced short-term variations appearing in typical streets, which are not correlated between locations. On the other hand, moderately accurate predictions can be achieved, even based on short-term sampling (a 3 × 15 minute sampling duration seems to be sufficient for many of the accuracy goals set related to static and dynamic monitoring). Finally, the method proposed also allows for the prediction of the evolution of statistical indicators.

Graphical abstract: Sampling approaches to predict urban street noise levels using fixed and temporary microphones

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Article information


Submitted
01 Apr 2011
Accepted
03 Aug 2011
First published
30 Aug 2011

J. Environ. Monit., 2011,13, 2710-2719
Article type
Paper

Sampling approaches to predict urban street noise levels using fixed and temporary microphones

A. Can, T. Van Renterghem, M. Rademaker, S. Dauwe, P. Thomas, B. De Baets and D. Botteldooren, J. Environ. Monit., 2011, 13, 2710
DOI: 10.1039/C1EM10292C

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