Comparison of FFP predictions with measurements of a low-frequency signal propagated in the atmosphere
Abstract
An experimental study of low-frequency propagation over a distance of 770 m was previously reported (J. Acoust. Soc. Am. Suppl. 1 86, S120 (1989)). For that study, sound speed profiles were reconstructed entirely from surface-layer micrometeorological data. When the acoustic data were compared with theoretical predictions from a fast field program (FFP), it was found that the FFP underpredicted sound levels measured in a shadow zone. Here, the effect on the predictions of including meteorological data for heights greater than the surface layer, i.e., wind profiles measured by a Doppler sodar, is discussed. Vertical structure of turbulence is simulated by stochastically perturbing the mean profiles, and the agreement between the acoustic data and FFP predictions is improved.
- Publication:
-
4th International Symposium on Long-Range Sound Propagation
- Pub Date:
- December 1990
- Bibcode:
- 1990lrsp.work..187W
- Keywords:
-
- Acoustic Properties;
- Acoustic Velocity;
- Atmospheric Turbulence;
- Low Frequencies;
- Meteorological Parameters;
- Micrometeorology;
- Sodar;
- Sound Propagation;
- Vertical Distribution;
- Wind Profiles;
- Comparison;
- Computer Programs;
- Distance;
- Height;
- Predictions;
- Simulation;
- Surface Layers;
- Acoustics