A contourtionist should not be confused with a contortionist: 'con-tor-tion-ist': one who contorts; specifically: an acrobat able to twist the body into unusual postures [Merriam-Webster's 11th Collegiate Dictionary). 'con-tour-tion-ist': one who calculates contours; specifically: a highway noise analyst able to twist traffic noise exposures into misleading positions. However, traffic noise contours are often desired by local land planning and zoning authorities to represent sound level exposures on land that is being considered for development and is adjacent to highways. The noise generated by a roadway is dictated by its traffic conditions. The traffic sound level at a particular location is determined by the generated noise and the sound attenuation from the roadway to the noise-sensitive location. This article is intended as a cautionary guide to estimating noise contours for highway noise exposures and to the limitations of contours for presenting noise exposure information. It is a consolidation of two recent papers - one explored the influence of site model geometry and contour computation parameters on estimated contour shape using the U.S. Federal Highway Administration (FHWA) Traffic Noise Model (TNM). The second examined the significance of a substantial upgrade to TNM released after the preparation of the initial paper and extended the previously reported contour modeling analyses.
Presenting highway noise exposures - the downfall of contourtionists
Vorlage Lärmbelastung Autobahn - the downfall of contourtionists
Sound and Vibration ; 40 , 8 ; 16-21
2006
6 Seiten, 16 Bilder, 4 Tabellen, 6 Quellen
Aufsatz (Zeitschrift)
Englisch
Representing Highway Noise Exposures: Return of the "Contourtionist"
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