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Conference_programme: 15.2 - The New CNOSSOS calculation method for environmental noise of road / railway / industrial noise

Lecture: Study of decision to be taken in Noise Maps of urban traffic applying CNOSSOS

Author(s): Aspuru Itziar, Garcia Igone, Fernandez Pilar, Santander Alvaro, Vazquez Manuel

Application of CNOSSOS method to calculate noise generated by traffic implies some changes, both in input data and in the use of new elements to simulate situations. There are particularities in urban situation that implies a specific approach in the modelling. On one hand, the type of vehicles in the city is different and also the speed is lower. Those particularities imply changes in the sound power of noise sources and, also the acoustic effects of some of the correction factors vary. \nThe communication presents a study of a real urban situation that allows the analysis of the effect of the presence of intersections. The study compares real data taken in situ and results from acoustic modeling. It is discussed which would be, in this case study, the best way of using the method to represent the reality. In general, it is observed that CNOSSOS method represents better than the Interim method the traffic noise in the case study. On the other hand, it seems that CNOSSOS could represent worse the pedestrian street scenario. Nevertheless, no conclusion can be drawn from this study. As a remarkable result it can be said that the calculations in this case study with different modelling alternatives with CNOSSOS can give noise levels that vary in 4.5 dB. This study should be complemented with other works that represent other situations to look for points in common and to establish possible general criteria for modelling traffic noise in the cities.

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Corresponding author

Name: Ms Itziar Aspuru

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Country: Spain