MODELING AND SIMULATION OF NOISE POLLUTION
For acoustic assessments, the CADNA software is used to calculate the propagation of road traffic noise in the external environment.
The model makes the assessment of noise pollution due to vehicular traffic, based on a geometric description of the site according to Cartesian coordinates, and a description of the information relating to the intensity of the sources (such as traffic volumes, travel speed etc…).
You can provide the model with a variety of additional source information, useful for a more correct representation especially of sound propagation, such as type of road surface, obstacle reflection characteristics.
The model allows, in addition to the sources, the description of various types of obstacles: building, later, embankments, wooded strips or generic attenuation areas.
Regarding noise pollution, the model provides results in terms of Leq over the daytime period, nocturnal or relative to an hour.
The return of results can take place on specific targets, providing global levels, as well as the contribution of each individual source, or via horizontal mapping (acoustic maps) a vertical (acoustic sections).
The software has been certified in accordance with European regulations and subjected to tests on sample cases, demonstrating a precision of acoustic results with deviations lower than 0,50 dB(A).
The types of simulation provided are as follows :
- calculation of the contribution of each road section to noise pollution;
- calculation of the overall noise pollution level in an area chosen by the user;
- calculation of the overall noise pollution level on a vertical section chosen by the user;
- calculation of the overall noise pollution level and for individual contributions on specific targets
MITIGATION INTERVENTIONS
from the analysis of the results obtained with the phonometric survey campaign and considering the existing acoustic characterization reported in the relevant documents, having predetermined the type of barrier to be used to contain and reduce noise in the area subject to intervention, simulations are carried out, assuming various heights of barriers in relation to the different acoustic conditions to be remedied, until results are obtained that satisfy the conditions established by current regulations regarding the maximum noise levels that can be tolerated in urban areas by railway infrastructures, roads, etc., in relation to the sensitive receptors already identified and registered for the territory subject to intervention.
The results of these simulations are reported in specific documents (plans representing the post-construction acoustic climate in the two reference periods: day and night), suitable for visually describing the positive result of the planned rehabilitation intervention.
Typology, the dimensions and location of the barriers used are therefore shown on a specific scale plan, while on other graphics the sections of the typological solutions adopted and the perspective views elaborated with rendering techniques are represented (photosimulations) to illustrate the environmental integration of the structures used to carry out the intervention
OTHER ENVIRONMENTAL SERVICES
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Study of environmental rehabilitation of pits and dumps
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Design and implementation of treatment and recovery plants
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Preliminary study and procedure for waste disposal
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study of the stability of the excavation faces