Comments on “The influence of wind and temperature gradients on sound propagation, calculated with the two way wave equations” [J. Acoust. Soc. Am. 87, 1987-1998 (1990)]

Richard Raspet, Lixin Yao, Steven J Franke, Michael J. White

Research output: Contribution to journalLetter

Abstract

In a recent paper Nijs and Wapenaar [J. Acoust. Am. 87, 1987-1998 (1990)] have developed a method for solving for the effects of horizontal winds on sound propagation in the atmosphere. In this development, Nijs and Wapenaar neglect terms containing the density gradient of the atmosphere which in their notation are comparable to the effects of the adiabatic temperature lapse rate on the sound-speed gradient. Their method represents a significant improvement over the use of an effective sound-speed gradient to express the effects of the wind only for high propagation angles. For these situations, one would expect errors due to the change in ambient pressure and density to be greatest. In this letter, a numerically attractive method to incorporate horizontal winds and a hydrostatic density gradient into a two-dimensional transform solution for sound propagation in the atmosphere is developed. In addition, Nijs and Wapenaar approximate the two-dimensional Fourier transforms by a single one-dimensional transform with little justification. Conditions are discussed under which such an approximation may be valid and it is demonstrated that these conditions are unlikely to be met by the two-dimensional kernal of Nijs and Wapenaar.

Original languageEnglish (US)
Pages (from-to)498-500
Number of pages3
JournalJournal of the Acoustical Society of America
Volume91
Issue number1
DOIs
StatePublished - Jan 1992

ASJC Scopus subject areas

  • Acoustics and Ultrasonics
  • Arts and Humanities (miscellaneous)

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