
Accession Number : ADA293657
Title : The Effects of Large and Small Scale Turbulence on Sound Propagation in the Atmosphere.
Corporate Author : ARMY RESEARCH LAB WHITE SANDS MISSILE RANGE NM
Personal Author(s) : Noble, John M. ; Auvermann, Harry J.
PDF Url : ADA293657
Report Date : MAR 1995
Pagination or Media Count : 64
Abstract : Propagation of acoustic waves in the atmosphere is affected by several mechanisms. Two of the effects are the scattering of sound by smallscale atmospheric turbulence and fluctuation of the speed of sound gradients by the passage of largescale atmospheric turbulence. Small and largescale atmospheric turbulence causes the acoustic waves to be altered by different mechanisms. Until recently, the majority of work in turbulence effect on acoustics has concentrated on the smallscale turbulence regime of the inertial subrange of the Kolmogorov spectrum. Earlier smallscale turbulence models have concentrated on the statisticalbased work of Tatarski. Current turbulence models deal more with the structural nature of the turbulence because the statistical approach does not account for all of the turbulence effects being measured during acoustic propagation experiments. The largescale turbulence problem cannot be handled very well with a statistical approach to atmospheric turbulence because the regime of the largescale turbulence extends into the energy containing subrange or sometimes referred to as the source region. This report discusses the current and past turbulence models used to treat the effect of small and largescale turbulence on atmospheric acoustic propagation. (AN)
Descriptors : *TURBULENCE, *ATMOSPHERIC MOTION, *ACOUSTIC SCATTERING, MATHEMATICAL MODELS, EXPERIMENTAL DATA, COMPARISON, TIME SERIES ANALYSIS, TEMPERATURE GRADIENTS, MATHEMATICAL PREDICTION, WAVE PROPAGATION, SOUND TRANSMISSION, WIND VELOCITY, ACOUSTIC SIGNALS, SOUND WAVES, STATISTICAL PROCESSES, GREENS FUNCTIONS, ACOUSTIC VELOCITY, ATMOSPHERIC REFRACTION, BACKGROUND NOISE, ACOUSTIC FIELDS, ACOUSTIC IMPEDANCE, EARTH ATMOSPHERE, SOUND RANGING.
Subject Categories : Acoustics
Distribution Statement : APPROVED FOR PUBLIC RELEASE