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Noise directionality for surface sources in range-dependent environments

 

作者: C. H. Harrison,  

 

期刊: The Journal of the Acoustical Society of America  (AIP Available online 1997)
卷期: Volume 102, issue 5  

页码: 2655-2662

 

ISSN:0001-4966

 

年代: 1997

 

DOI:10.1121/1.420319

 

出版商: Acoustical Society of America

 

数据来源: AIP

 

摘要:

An earlier paper [J. Acoust. Soc. Am.99, 2055–2066 (1996)] tackled the calculation of ambient noise and noise coherence in a range-independent reflecting or refracting environment with horizontal distributions of noise sources. The approach was analytical producing some closed-form solutions and never more than a single well-behaved integral to solve. In this paper the azimuth and elevation dependence of the noise over a sloping bottom is investigated. The analytical and graphical results explicitly show the effects of upslope and downslope bottom reflections on the “noise notch,” and in passing they explain the flatness of the angle distribution sought by Dashen and Munk [J. Acoust. Soc. Am.76, 540–554 (1984)]. It is also clear that, contrary to one’s intuition, three-dimensional horizontal bending effects on the noise directionality may be significant because of the large contribution from distant sources.

 

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