» Noise » Prediction and mapping of noise
Prediction and mapping of noise
Noise levels at specific locations can be calculated instead of being measured. This is necessary in cases where it is practically difficult or impossible to perform measurements. Prediction models are the means by which, not only noise levels, but also, propagation of noise over extended areas around sources can be calculated.
Prediction is preferred over measurements in the following cases:
- number of receiver points at which the noise levels must be ascertained is high or their access is limited
- a site is in a planning phase and the sources do not physically exist; future noise levels need to be predicted
- different development alternatives and noise reduction scenarios need to be compared
- noise contour maps need to be produced
In order to predict noise levels and noise propagation, a topographical model needs to be built. Relevant buildings and obstacles are included into the model as well as sources from which noise must be calculated. Factors affecting the noise propagation, such as wind, temperature, ground absorption, reflections etc. are parameters to be considered when building the model. Prediction models necessitate extensive data collection as well as acoustical skills and modeling experience to deliver reliable noise level calculation results.
Akukon uses Datakustik CadnaA, the industry leading noise prediction and abatement software. In Finland, the Nordic Prediction Method is the preferred calculation standard for industry, road and railway noise but we can also perform calculations according to other international standards using CadnaA software.
Below is a list of services that our company can deliver using prediction software:
- calculation of noise levels at predefined receiver positions
- noise maps on horizontal or vertical grids
- calculation of noise levels on grids enveloping facades
- determination of the number of exposed inhabitants
- assessment of noise control scenarios
- dimensioning of noise barriers
- strategic noise mapping according to the EC-Directive on Environmental Noise 2002/49/EC.
