VALIDATION AND EVOLUTION OF THE ROAD TRAFFIC NOISE PREDICTION MODEL NMPB-96 - PART 1: COMPARISON BETWEEN CALCULATION AND MEASUREMENT RESULTS

The French road traffic noise prediction model NMPB-96 takes into account the influence of the real weather conditions of the site on sound propagation. In order to complement the model validation and to prepare its final version, a measurement campaign took place on six sites bordering motorways. On each site, sound levels at short and large distance (up to 400 m from the road), weather parameters and traffic were measured on 10 minute periods during at least two weeks so as to observe a large diversity of weather conditions. These 10 minute samples have been classified and averaged according to the weather conditions. The sound attenuation due to propagation has been compared with the predictions given by NMPB-96 for conditions favourable to propagation (positive sound speed gradient) in all directions and for homogeneous atmosphere conditions (roughly no sound speed gradient). Measurement results for whole daytime and night-time periods have also been compared to predictions based on the relevant distribution of weather conditions. The agreement between calculation and measurement results is satisfactory, even at large distances, for microphones with a direct view of the road, and also when the road is screened off by a vertical obstacle. For microphones located below the road level (road on embankment or viaduct), the model overestimates the measurements by 3 to 5 dB (A). A few other specific situations have also been considered to need enhancements in the model. The work carried out to upgrade NMPB is described in part 2: Improvements based on theoretical models. (A) For the covering abstract see ITRD E113232.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/980655414
• Corporate Authors:

  CONGRESS SECRETARIAT

  VOORWEG 105-A
  ZOETERMEER,   Netherlands  NG 2715
• Authors:
  • BESNARD, F
  • LEFEVRE, H
  • ZOUBOFF, V
• Conference:
  • INTER-NOISE 2001 - ABSTRACTS FROM INTERNATIONAL CONGRESS AND EXHIBITION ON NOISE CONTROL ENGINEERING
  • Location: THE HAGUE , Netherlands
  • Date: 2001-8-27 to 2001-8-30
• Publication Date: 2001

Language

• English

Media Info

• Features: References;
• Pagination: p. 2401-6

Subject/Index Terms

• TRT Terms: Bridges; Conferences; Cutting (Earthwork); Embankments; Forecasting; Freeways; Mathematical models; Noise; Traffic; Weather
• Geographic Terms: France
• ITRD Terms: 3455: Bridge; 8525: Conference; 2812: Cutting (earthworks); 2801: Embankment; 132: Forecast; 8036: France; 6473: Mathematical model; 2752: Motorway; 2492: Noise; 755: Traffic; 2545: Weather
• Subject Areas: Bridges and other structures; Environment; Highways; Operations and Traffic Management;

Filing Info

• Accession Number: 00927118
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• ISBN: 9-806554-1-4
• Files: ITRD
• Created Date: Jul 8 2002 12:00AM