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Related Experiment Videos

Noise duration for a single overflight.

Rufin Makarewicz1, Hanna Wojciechowska

  • 1Institute of Acoustics, A. Mickiewicz University, 61-614 Poznan, Umultowska 85, Poland. makaaku@amu.edu.pl

The Journal of the Acoustical Society of America
|July 26, 2003
PubMed
Summary

Aircraft overflights disrupt natural soundscapes in protected areas. This study introduces a noise metric, P, calculating the percentage of time aircraft are audible, crucial for park acoustics management.

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Area of Science:

  • Acoustics
  • Environmental Science
  • Aviation Noise

Background:

  • Overflights in national parks and preserves disrupt natural communication and soundscapes.
  • Audible aircraft noise percentage (P) is a key metric for assessing noise pollution.
  • Calculating P requires determining the overflight time (tau) for individual aircraft.

Purpose of the Study:

  • To develop a method for calculating aircraft overflight time (tau).
  • To establish a noise metric (P) for assessing the impact of aircraft noise in natural areas.
  • To derive analytical formulas for tau under different flight conditions.

Main Methods:

  • Modeling aircraft as a point source for noise propagation.
  • Accounting for geometrical spreading, air absorption, and atmospheric refraction in sound propagation.
  • Characterizing the atmosphere using the effective sound speed gradient.
  • Deriving analytical formulas for tau in downwind and crosswind flight scenarios.

Main Results:

  • A method for calculating aircraft overflight time (tau) has been established.
  • Analytical formulas for tau were successfully derived for downwind and crosswind flights.
  • The study provides a foundation for calculating the audible aircraft noise percentage (P).

Conclusions:

  • The developed method accurately calculates aircraft overflight time (tau).
  • This research contributes to a better understanding and quantification of aircraft noise impacts in national parks and preserves.
  • The noise metric P, based on tau, can aid in managing and mitigating noise pollution in sensitive environments.

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