The Norwegian Noise Annoyance Calculations

1. The Norwegian Noise Annoyance Calculations

2. Background • The national target for noise reduction: By 2010 noise annoyance shall be reduced by 25 per cent from the 1999 level.

3. Statistics Norways noise model • Calculates data for noise impact and annoyance, in Norway for 1999 and following years. • Estimates the noise from • road traffic • aircraft • railways • industry • Results given as • Noise Annoyance Index (SPI)

4. Measuring noise annoyance • Noise annoyance differs • with the source of noise • 60 dB of aircraft-noise more annoying than 60 dB of railroad-noise • from person to person • at the same noise level some will be higly annoyed, some not annoyed at all. • Development of the Average Annoyance Score

5. Average annoyance score • dose-respons curve based on respondents describing their annoyance due to noise • estimates on a scale from 0-1 how annoyed an average person will be by noise from a particular source

6. Noise Annoyance Index (SPI) • calculated by multiplying the number of exposed persons within each noise-level with the average annoyance-score for this level. • f.ex • 100 persons exposed to 60 dB • from Aircraft: (1,83 x (60dB – 38))/100 = 40 • from Railroad: (1,19 x (60dB – 36))/100 = 29 Annoyance scores from different noise levels and sources can be added together to give a total level of annoyance for a community.

7. The noise model in general

8. Calculation of railroad noise • Noise emission calculated • by the Nordic prediction method for railroad noise • on the basis of • train type • trainlength during 24h (meter) • speed (km/h) • Result: • each railroadlink identified by a code and the first and last kilometer of the link, desibel-level generated • Distributed along a geographic railroad-layer • using dynamic segmentation • on the basis of a railroad link code, and the first and last kilometers

9. Dynamic segmentation; Applying noise level to geography

10. Noise emission; Norwegian railroad network

11. Noise level connected to adresses distance railroad-adress measurred

12. Noise at adress level • Calculating noise reduction due to • divergence (4 dB per. doubling of distance) • air absorbsion • correction for track conditions • if the receving adress is an appartment building • shielding from buildings in the neighbourhood

13. Calculation of shielding • Calculated for each adress individually • Calculated on the basis of buildings between adress and railroad • the buildings coordinates • build-up area • Calculates • radius of the buildings base • distance from adress to building • the part of an 180o view angel that the buildning will shield

14. Shielding from buildings

15. Calculation of road traffic noise • Simmilar to the railroad calculations, except.. • The calculations are being done for one type of road at the time • european roads • national roads • county roads • local roads • An adress is assigned the highest noise value that reaches the adress

16. Calculation of aircraft noise • NORTIM-files • noise levels in a point grid • Used for calculation of • emission of noise • diffusion over the ground • Noiselevel updated from trafficnumbers and noise prognoses • Adresses connected to the nearest point in the grid

17. Calculation of industry noise • buisnesses (buisness register) located in industry buildnings (GAB) • assigned a noiselevel dependent on NACE-code • rate of change dependent on density of buildings within ...? meters • adress is assigned the highest noiselevel that reaches it