Impulse propagation in the nocturnal boundary layer: analysis of the geometric component

The Journal of the Acoustical Society of America
Philip Blom, Roger Waxler

Abstract

On clear dry nights over flat land, a temperature inversion and stable nocturnal wind jet lead to an acoustic duct in the lowest few hundred meters of the atmosphere. An impulsive signal propagating in such a duct is received at long ranges from the source as an extended wave train consisting of a series of weakly dispersed distinct arrivals followed by a strongly dispersed low-frequency tail. The leading distinct arrivals have been previously shown to be well modeled by geometric acoustics. In this paper, the geometric acoustics approximation for the leading arrivals is investigated. Using the solutions of the eikonal and transport equations, travel times, amplitudes, and caustic structures of the distinct arrivals have been determined. The time delay between and relative amplitudes of the direct-refracted and single ground reflection arrivals have been investigated as parameters for an inversion scheme. A two parameter quadratic approximation to the effective sound speed profile has been fit and found to be in strong agreement with meteorological measurements from the time of propagation.

References

Oct 26, 2002·The Journal of the Acoustical Society of America·Oleg A Godin
May 19, 2005·The Journal of the Acoustical Society of America·Igor ChunchuzovVitaly Perepelkin
Feb 4, 2006·The Journal of the Acoustical Society of America·Roger WaxlerKenneth E Gilbert
Dec 3, 2008·The Journal of the Acoustical Society of America·Roger WaxlerCarrick Talmadge
Dec 10, 2008·The Journal of the Acoustical Society of America·Carrick L TalmadgeSergey Kulichkov

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Citations

Oct 15, 2013·The Journal of the Acoustical Society of America·Julius T FrickeLäslo G Evers
Oct 18, 2014·The Journal of the Acoustical Society of America·Omar MarcilloW Scott Phillips
Apr 24, 2016·The Journal of the Acoustical Society of America·Rufin Makarewicz
Apr 30, 2015·The Journal of the Acoustical Society of America·Roger WaxlerPhillip Blom
Jul 3, 2016·The Journal of the Acoustical Society of America·Philip BlomStephen Arrowsmith
Jan 1, 2018·The Journal of the Acoustical Society of America·Philip Blom, Roger Waxler
Oct 3, 2019·Nature Communications·Thomas R WalterPeter Gaebler
May 3, 2018·The Journal of the Acoustical Society of America·Sarah AlbertDouglas Seastrand
May 4, 2017·The Journal of the Acoustical Society of America·Philip Blom, Roger Waxler
May 3, 2019·The Journal of the Acoustical Society of America·Philip Blom
Dec 3, 2020·The Journal of the Acoustical Society of America·I Vera RodriguezA Le Pichon
Jan 1, 2021·The Journal of the Acoustical Society of America·Fransiska K Dannemann DugickStephen Arrowsmith
Nov 4, 2020·The Journal of the Acoustical Society of America·Philip Blom
Aug 27, 2021·Geophysical Research Letters·Quentin BrissaudGerald J Walsh

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