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Sound speed profile structure and variability measured over flat terrain

Bradley, SG, Waddington, DC and Von Hunerbein, S 2006, Sound speed profile structure and variability measured over flat terrain , in: 13th International Conference on Sound and Vibration, 2 - 6 July 2006, Vienna, Austria.

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Abstract

This paper describes a fundamental data base and data-variability guide for outdoor sound propagation models requiring sound speed profiles. The vertical sound speed profile has been measured directly over an extended period at a flat terrain site and to a height of 150m using a RASS (radio-acoustic sounding instrument). Additionally, vector wind profiles were available at 10m height intervals from a SODAR (an acoustic radar), and carefully calibrated wind and temperature data recorded at a number of fixed sites on a 120m mast. Combinations of these data sources are used to evaluate a number of influences, which include: applicability of the log-linear approximation; vertical variability of sound speed; change of wind direction with height; vector sound speed variability; effects of averaging intervals; short-term gust effects; longer-term diurnal effects; and fetch. These results demonstrate how variations in temperature, wind speed, and wind direction propagate through to sound speed profile changes, and into fitted parameter changes, thereby providing guidance on interpretation of comparisons between model output and propagation measurements.

Item Type: Conference or Workshop Item (Paper)
Themes: Subjects / Themes > Q Science > QC Physics > QC221-246 Acoustics - Sound
Subjects / Themes > Q Science > QC Physics > QC851-999 Meteorology - Climatology
Subjects outside of the University Themes
Schools: Colleges and Schools > College of Science & Technology
Colleges and Schools > College of Science & Technology > School of Computing, Science and Engineering
Colleges and Schools > College of Science & Technology > School of Computing, Science and Engineering > Acoustics Research Centre
Refereed: Yes
Depositing User: SUM Von-Hunerbein
Date Deposited: 19 Aug 2010 10:43
Last Modified: 20 Aug 2013 16:20
URI: http://usir.salford.ac.uk/id/eprint/9593

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