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Municipal noise reduction plans

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  • 1. MUNICIPAL NOISE REDUCTION PLANS A CASE STUDY Márcia Melro, Luís Conde Santos [email_address] www.dblab.pt we listen to the environment
  • 2. Summary
    • Introduction
    • Guidelines and objectives of the Plan
    • Characterization of the municipality of Póvoa de Varzim
    • Acoustic zoning
    • Municipal Noise Reduction Plan
    • Ranking criteria and areas for action
    • Noise abatement measures
    • Conclusions
  • 3. Introduction
    • Portuguese Noise Law – DL9/2007:
      • All municipalities have to produce a Municipal Noise Map, as well as Acoustic Zoning and a Noise Reduction Plan
      • The Acoustic Zoning Maps that must be included as part of the municipal Master Plan,
      • Areas acoustically classified that are exposed to outdoor ambient noise above the limiting values, must be included in a Municipal Noise Reduction Plan (MNRP)
    • This paper presents a case study of one of the first MNRP to be elaborated in Portugal, of the municipality of Póvoa de Varzim, north of Porto
  • 4. Guidelines and objectives
    • 1. Define an acoustic zoning, delimiting of the acoustically classified zones, which in turn can be classified as Mixed or Sensitive, according to the Law;
    • 2. Identify the conflict areas – areas where noise level are above the legal limits – defining priorities for action;
    • 3. Identify who is the entity responsible for the noise sources which cause de excess levels in the classified areas;
    • 4. Quantify and rank the contributions of different noise sources to the excess levels, grouped by responsible entity, and quantify the population exposed to the high noise levels;
    • 5. Study appropriate noise abatement measures for each situation, both four sources under the direct responsibility of the municipality as for others, and schedule its implementation for a time horizon of 5 years – time horizon defined for the MNRP.
  • 5. Characterization of the municipality and its noise sources
    • Municipality of Póvoa de Varzim
      • Located between rivers Cávado and Ave,
      • on the north coast of Portugal
      • Total area: 82,1 km²
      • Population: 66.463
      • Population density:
        • 3.035 persons//km², in the main urban area
        • 355,5 persons//km², in suburban and rural areas
      • Noise sources responsibilities:
        • • Municipal authority: municipal roads and all the streets in the city and villages of the municipality;
        • • E.P. - Estradas de Portugal (national road public company): all national roads and complementary access roads;
        • • Euroscut Norte (private motorway company): motorway A28;
        • • Metro do Porto (surface metro company): line B of the surface metro;
        • • Several private companies: industrial noise
  • 6. Major noise sources and urban agglomerations in Póvoa municipality
  • 7. Noise maps
    • L den and L n noise maps of the municipality of Póvoa
  • 8. Noise indicators for urban planning
    • Periods:
      • 13h daytime period (7:00h – 20:00h)
      • 3 h evening period (20:00h – 23:00h)
      • 8h night period (23:00h - 7:00h)
    • Noise indicators:
      • day-evening-night noise indicator L den
      • and the night time noise indicator L n
  • 9. Acoustic zoning
    • Sensitive zone: exclusively residential or for schools / hospitals or for sensitive leisure activities
    Mixed zone: with sensitive receivers but mixed with others uses, such as commercial, services or industrial Noise limits: 55/45 65/55 Isolated Receivers mixed/sensitive - - Industrial Zone 55 65 Sensitive Zone near a large transportation infrastructure 45 55 Sensitive Zone 55 65 Mixed Zone L n dB(A) L den dB(A) Noise Zone Classification Classification and delimitation of mixed and sensitive zones, based on actual or planned land use
  • 10. Acoustic zoning for Póvoa
  • 11. Municipal Noise Reduction Plan Areas and population exposed to road noise separated by responsibility
  • 12. Municipal Noise Reduction Plan Areas and population exposed to rail noise and to industrial noise (industrial areas A, B, C, D) Clearly road traffics noise has the largest values of population exposed
  • 13. Municipal Noise Reduction Plan
    • Conflict areas
    L n Excess contribution relative to limit values for each responsible. Roads:
  • 14. Ranking criteria Identification of areas for action
    • Ranking criteria
      • To define priorities in selecting areas for application of noise abatement measures and help establishing what these measures would actually be.
        • 1. Excess of more than 5 dB(A) above the noise limits
        • Practicability of implementation within a time frame of 5 years
    • Identification of areas for action
      • 21 areas - within the major urban area of the municipality
        • All noise sources involved were roads and streets under the responsibility of the municipal authority.
        • Noise abatement measures defined and quantified,
      • 11 areas - in other parts of the municipality.
        • Absence of a direct cooperation between the local authority, responsible for the noise reduction plan study, and the external entities responsible for some of the noise sources.
        • Only the noise reduction requirement have been defined, not the solution itself, which must be defined later on by the external entity (for example: noise barriers in the motorway).
  • 15. Noise abatement measures
    • For each area for action
      • identification and ranking of the noise sources
      • for each source:
        • noise reduction measures proposed,
        • its expected reduction in noise levels quantified
        • and a schedule for its implementation proposed.
      • detailed noise maps before and after implementation of noise abatement measures.
    • Criteria:
      • action on the noisiest source
      • measures with the best cost-benefit ratio.
      • priority for action at the source,
      • actions on the propagation path or on the receiver as 2nd option
  • 16. Noise abatement measures
    • Actions on the source:
      • Traffic volume reduction
      • Traffic deviation
      • Replacement of road pavement
      • Street requalification / narrowing
      • Elevated pedestrian crossings
      • Creation of 30 Km/h areas
  • 17. Noise abatement measures
    • Actions on the propagation path:
      • Artificial noise barriers
      • Natural noise barriers
    • Action on the receiver
      • Façade insulation
  • 18. Expected results
    • Substantial reduction of number of people and total area exposed to levels in excess of more than 5 dB(A)
      • example: reduction of 71% on number of people exposed to more than 70 dB(A) of Lden.
    • More moderate reduction for number of people and area exposed to excess levels of less than 5 dB(A)
    • Just below legal limits for mixed zones it is observed a slight increase in number of persons exposed, basically due to people who were exposed to higher levels and moved to this noise class. In the exposed areas a consistent reduction is expected.
  • 19. Conclusions
    • The Municipal Noise Reduction Plan presented in this paper was one of the first to be done in Portugal.
    • For such a Plan to be successful, the acoustic consultancy team must work together and very close to the Municipality staff, from Departments of Environment, Planning, Traffic, and the political level should also be involved to some extent.
    • The results show that the Plan, although not solving all noise problems in the municipality, will definitely have a positive impact on the reduction of noise levels and on the number of people exposed to the highest noise levels.
    • A weak point in the Plan is the lack of definition of the measures to be taken for some of the major roads in the municipality, which are managed by entities external to the municipality.
    • It is recommended that in future similar situations more effort is put in trying to involve in an effective way all entities with responsibilities over noise sources with impact within the municipality.

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