Long range sound propagation near the ground
Abstract
The characteristics of long-range sound propagation near the ground were investigated, and semiempirical laws valid for several reliefs and soils, and various meteorological conditions were derived. Experiments were conducted at Villeau, France, a flat area with a 100-m-high meteorological tower. Instantaneous values of temperature, air hygrometry, and wind velocity and direction in a horizontal plane were available at heights of 4, 6, 12, 24, 48, 72, and 96 m; the sound source was placed at 3 m above the ground. Acoustic measurements were documented, with simultaneous recordings of 13 signals in three different directions, along with meteorological data. The two series of tests analyzed in the present paper gave partial results. However, comparison of these computations with experimental results showed that sound attenuation was predicted with a sufficient accuracy.
- Publication:
-
ONERA
- Pub Date:
- 1988
- Bibcode:
- 1988inno.conf.....C
- Keywords:
-
- Atmospheric Turbulence;
- Ground Wave Propagation;
- Meteorological Parameters;
- Sound Propagation;
- Wind Effects;
- Acoustic Attenuation;
- Humidity Measurement;
- Temperature Effects;
- Acoustics