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The Norwegian Noise Annoyance Calculations

This noise model in Norway calculates data for noise impact reduction, analyzing road traffic, aircraft, railways, and industry noise. The Noise Annoyance Index measures annoyance based on varied sources, providing an Average Annoyance Score. Shielding calculations are done for individual addresses based on building structures to reduce annoyance levels effectively.

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The Norwegian Noise Annoyance Calculations

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  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

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