METEOROLOGICAL AND GROUND EFFECTS ON THE PROPAGATION OF AIRCRAFT NOISE CLOSE TO THE EARTH'S SURFACE

Dickinson reported observations of unexpectedly low attenuations between aircraft take-off noise levels measured at ranges of 320 m and 2900 m at London (Gatwick) Airport. The anomalous attenuations were attributed to the effects of focussing by a temperature inversion. These data are investigated and a ray trace study shows that the low attenuations are unlikely to be caused by atmospheric focussing by the temperature inversion. Further, it is shown that a combination of the effects of a finite impedance ground and of atmospheric refraction in overcoming part of the ground absorption at the distant position can adequately explain the observed data.

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  • Corporate Authors:

    Academic Press Incorporated

    24-28 Oval Road
    London NW1 7DX,   England 
  • Authors:
    • Chessell, C I
  • Publication Date: 1978-9

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Filing Info

  • Accession Number: 00194694
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: Jun 13 1979 12:00AM