PATENT N°99 08039
Sound level criteria applied to town planning
This tool is a system of identification and characterisation of the soundscape (i.e. the “acoustic landscape”) of a site as a function of urban types. From the following urban characteristics: urban fabric, type of way and distance, and at a given point on the site, the major components of the soundscape by day and by night are calculated, as well as the maximum acceptable expected sound level value.
This tool helps defining the frontier beyond which the exposed population expresses disturbance. These criteria meet the requirements of standards NFS 31010 and NFS 31110 and conform to the European directive 2002/49/CE, relating to te evaluation and noise management on the environment.
The sound components characteristic of the urban and suburban sound landscapes result from the summation of the noise of the air and surface transports and the noise emitted by human activities. The sources are many and multiple. It is difficult to determine their components, whatever the day of the year.
However, the knowledge of the sound components of the sound landscapes of our cities makes it possible to know if the establishment of a road or the establishment of such or such industry, artisanal zone or amusement zone, will involve modifications of these sound components and thus, is likely to generate a nuisance in the vicinity (within the meaning of the law on noise of 1992).
Faced with the complexity of the sound landscapes, and considering the impossibility to carry out predictive cartography of the noise due to the totality of the urban sound sources, roads and human activities, it appeared necessary to have a global and statistical approach of the subject through Urbanistic Noise Map Noise Criteria.
Identification of town planning yields immediately the criteria of maximum acceptable noise levels in the environment of the observer, whether by day or night.
This information, related to a Geographic Information System, today makes it possible to map the criteria of maximum acceptable noise levels in the environment. See examples hereafter.