Noise maps development
A noise map is one of the ways to evaluate the acoustic situation in the area.
The noise map is a ground map or plan of the limited territory with marked data on noise conditions which allows to evaluate integrated noise exposure from all sources on a given territory and noise exposure from individual sources and to predict total noise exposure on a given territory.
Levels of equal intensity on noise maps are highlighted with colour. In some cases due to necessity of clear distinction between facilities, only a dividing line indicating values of these levels is used to denote borders of equal noise levels.
Unlike the method of discrete calculations, in each selected control/measurement point, a noise map allows to know immediately exact noise levels in any point on the whole area under examination.
The advantage of noise maps is the simplicity of their perception.
Zones highlighted with colour correspond to specific noise levels. Zoning can be made with an interval of 1, 5, 10 and more dB(A).
Zones with high noise levels are usually coloured in red and dark blue, with levels corresponding to standard values Ц green, close to normal and borderline values Ц yellow and orange.
As a result, simplicity of noise maps perception allows to evaluate noise levels in any point of the area in the shortest time.
Noise map allows:
- to evaluate an area from the acoustic point of view;
- to define a noisiness status in different parts of a city;
- to know the most unfavourable city areas;
- to respond to complaints of the citizens about high noise level;
- to make decisions on taking noise mitigation measures;
- to make decisions on construction sites for new residential houses.
In Saint-Petersburg the scientists from our organization the Baltic State Technical University СVOENMEHТ and the Institute of architecture prepared a unique noise map of Saint-Petersburg in 2006.
While developing the noise map, the acoustic load in so called zoned areas was taken into account.
The city was divided into equal squares 50x50 m, which covered around a thousand of residential houses.
Buildings location and height, speed, intensity and type of traffic flows (trucks and cars, trams and trolleybuses), availability of factories, boiler houses, heat stations, industrial areas, harbours and airports were evaluated in each square.
Acoustic performance was measured in all these and other significant sources and the calculation of the noise map was performed with the help of the latest software СSoundPlanТ.
The map shows the most СproblematicТ noise sources. That means it can be used for disposition of the funds for noise reduction.
Sites for new buildings construction or building new roads are defined according to this map.
The map also shows if the address of a resident of St. Petersburg complaining about increased noise level is in a dangerous zone.
Maps of the city noises