Statistics of normal mode amplitudes in an ocean with random sound-speed perturbations: Cross-mode coherence and mean intensity

被引:41
|
作者
Colosi, John A. [1 ]
Morozov, Andrey K. [2 ]
机构
[1] USN, Postgrad Sch, Dept Oceanog, Monterey, CA 93943 USA
[2] Woods Hole Oceanog Inst, Dept Appl Ocean Phys & Engn, Woods Hole, MA 02543 USA
来源
关键词
ACOUSTIC PULSE-PROPAGATION; INTERNAL WAVES; LONG-RANGE; FLUCTUATIONS; SCATTERING; FIELD;
D O I
10.1121/1.3158818
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
In this paper Creamer's [(1996). J. Acoust. Soc. Am. 99, 2825-2838] transport equation for the mode amplitude coherence matrix resulting from coupled mode propagation through random fields of internal waves is examined in more detail. It is shown that the mode energy equations are approximately independent of the cross mode coherences, and that cross mode coherences and mode energy can evolve over very similar range scales. The decay of cross mode coherence depends on the relative mode phase randomization caused by coupling and adiabatic effects, each of which can be quantified by the theory. This behavior has a dramatic effect on the acoustic field second moments like mean intensity. Comparing estimates of the coherence matrix and mean intensity from Monte Carlo simulation, and the transport equations, good agreement is demonstrated for a 100-Hz deep-water example. (C) 2009 Acoustical Society of America. [DOI: 10.1121/1.3158818]
引用
收藏
页码:1026 / 1035
页数:10
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