THE PROPAGATION OF AVERAGE SOUND LEVELS OF TRAFFIC NOISE IN FLAT UNBUILT-UP AREAS

ZUR AUSBREITUNG DES MITTELUNGSPEGELS VON STRASSENVERKEHRSGERAEUSCHEN IN HORIZONTALEM UNBEBAUTEN GELAENDE

The reduction in the average level of traffic noise was measured in relation to the distance from the centre of the highway, or in the case of motorways from the centre of the nearest carriageway, across horizontal open space (meadows and fields). Evaluation of the results shows that wind has little influence on noise levels when it is blowing from the road to emission point but it has a very strong influence when it is blowing in the opposite direction. It affects the noise level over 200M by 3 db(a) when the sound travels with the wind and by 10 db(a) when it is in the opposite direction. The wind direction is therefore critical when calculating the average sound level. An analysis of results shows when the wind is blowing from the source, that the equivalent sound level of a traffic stream with a small emission angle of under 10 degrees is dependent upon the size of the angle. From the test results the effect of the angle can be established. The mathematical relations are described in detail, and also for the case where woodland is sited between the road and the emmission site. (TRRL)

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  • Corporate Authors:

    VJF Lehmanns Verlag

    Agnes-Bernauer Platz 8
    8 Munich 21,   Germany 
  • Authors:
    • ULLRICH, S
  • Publication Date: 1977-12

Language

  • German

Media Info

  • Features: Figures; References;
  • Pagination: p. 168-173
  • Serial:
    • Kampf dem Laerm
    • Volume: 24
    • Issue Number: 6
    • Publisher: VJF Lehmanns Verlag
    • ISSN: 0022-8249

Subject/Index Terms

Filing Info

  • Accession Number: 00309527
  • Record Type: Publication
  • Source Agency: Bundesanstalt für Straßenwesen (BASt)
  • Report/Paper Numbers: ANALYTIC
  • Files: ITRD, TRIS
  • Created Date: Mar 12 1981 12:00AM