The problem of acoustical noise produced by transportation infrastructures is a serious issue to be considered in urban planning and in mitigation actions design. In particular, road traffic is one of the most important source, basically all around the world, in particular in developed countries. Since it is related to several parameters, such as number and typology of vehicles, speed, road conditions, geometry and orography of the site, distance between source and receiver, etc., road traffic noise is very difficult to be properly modelled and predicted at any distance. Even if a serious modelling may be helpful in the design phase, if the road network is already present, the choice and the effectiveness evaluation of several mitigation actions has to be carefully investigated. In this paper, the reduction to noise level produced by the introduction of noise barriers is studied, by means of literature, regulation and software approaches. These three methods will be tested on a case study, where a motorway crosses a residential area, with a new building sets. Results will show that all the methods confirm the better performances of a higher barrier, but it will be shown that diffraction and other parameters have to be carefully taken into account to avoid incorrect evaluation.
Comparison of Acoustic Barriers Noise Reductions Evaluated by Different Calculation Methods
GUARNACCIA, CLAUDIO;QUARTIERI, Joseph;
2014-01-01
Abstract
The problem of acoustical noise produced by transportation infrastructures is a serious issue to be considered in urban planning and in mitigation actions design. In particular, road traffic is one of the most important source, basically all around the world, in particular in developed countries. Since it is related to several parameters, such as number and typology of vehicles, speed, road conditions, geometry and orography of the site, distance between source and receiver, etc., road traffic noise is very difficult to be properly modelled and predicted at any distance. Even if a serious modelling may be helpful in the design phase, if the road network is already present, the choice and the effectiveness evaluation of several mitigation actions has to be carefully investigated. In this paper, the reduction to noise level produced by the introduction of noise barriers is studied, by means of literature, regulation and software approaches. These three methods will be tested on a case study, where a motorway crosses a residential area, with a new building sets. Results will show that all the methods confirm the better performances of a higher barrier, but it will be shown that diffraction and other parameters have to be carefully taken into account to avoid incorrect evaluation.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
