Outdoor sound level variations due to fluctuating meteorological parameters
✍ Scribed by Bengt Hallberg; Conny Larsson; Sven Israelsson
- Publisher
- Elsevier Science
- Year
- 1989
- Tongue
- English
- Weight
- 276 KB
- Volume
- 26
- Category
- Article
- ISSN
- 0003-682X
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✦ Synopsis
Simultaneous measurenwnts of meteorological parameters and octave-band sound levels from a point source, over .finite impedance ground, have been carried out. A ray-tracing model was used to predict sound levels. A 5-rain nwasurement period was divided into lO-s intervals, and the effect of the meteorological.fluctuations on the measured and predicted sound levels was studied. The nwteorological fluctuations were rather large due to the lapse conditions. The results with the ray-tracing model were more sensitive to nwteorological variations than was indicated by the measurements. A verages ~['the predicted sound levels, based on the lO-s intervals, were compared with those predieted ./i'om average meteorological conditions, as well as with average nwasured sound levels. The.h'rst of these ray-tracing results was in better agreenwnt with the measurenwnts. It seems that during periods with large meteorological.fluctuations, the predicted sound level based on averages can be quite h7 error. It was also concluded that meteorological fluctuations on a longer tinw-scale can give similar results to the small-scale turbulence effect, causing decoherence o['sound rays.