Ocean acoustic wave propagation and ray method correspondence: Internal wave fine structure

被引:19
作者
Hegewisch, KC [1 ]
Cerruti, NR [1 ]
Tomsovic, S [1 ]
机构
[1] Washington State Univ, Dept Phys, Pullman, WA 99164 USA
关键词
D O I
10.1121/1.1854842
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
Acoustic wave fields propagating! long ranges through the ocean are refracted by the inhomogeneities in the ocean's sound speed profile. Intuitively, for a given acoustic source frequency, the inhomogeneities become ineffective at refracting the field beyond a certain fine scale determined by the acoustic wavelength. On the other hand, ray methods are sensitive to infinitely tine features. Thus, it is possible to complicate arbitrarily the ray dynamics, and yet have the wave field propagate unchanged. This feature raises doubts about the ray/wave correspondence. Given the importance of various analyses relying on ray methods, a proper model should, at a minimum, exclude all of the fine structure that does not significantly alter the propagated wave field when the correspondence to the ray dynamics is integral. We develop a simple, efficient, smoothing technique to be applied to the inhomogeneities-a low pass filtering performed in the spatial domain-and give a characterization of its necessary extent as a function of acoustic source frequency. We indicate how the smoothing improves the ray/wave correspondence, and show that the so-called "ray chaos" problem remains above a very low frequency (similar to 15-25 Hz). (c) 2005 Acoustical Society of America.
引用
收藏
页码:1582 / 1594
页数:13
相关论文
共 34 条
[1]  
[Anonymous], P S APPL MATH
[2]  
[Anonymous], 1991, CHAOS QUANTUM PHYS
[3]   CONDITION OF STOCHASTICITY IN QUANTUM NON-LINEAR SYSTEMS [J].
BERMAN, GP ;
ZASLAVSKY, GM .
PHYSICA A, 1978, 91 (3-4) :450-460
[4]   Ray stability in weakly range-dependent sound channels [J].
Beron-Vera, FJ ;
Brown, MG .
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, 2003, 114 (01) :123-130
[5]   EVOLUTION OF SEMI-CLASSICAL QUANTUM STATES IN PHASE-SPACE [J].
BERRY, MV ;
BALAZS, NL .
JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL, 1979, 12 (05) :625-642
[6]   QUANTUM MAPS [J].
BERRY, MV ;
BALAZS, NL ;
TABOR, M ;
VOROS, A .
ANNALS OF PHYSICS, 1979, 122 (01) :26-63
[7]   Ray dynamics in long-range deep ocean sound propagation [J].
Brown, MG ;
Colosi, JA ;
Tomsovic, S ;
Virovlyansky, AL ;
Wolfson, MA ;
Zaslavsky, GM .
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, 2003, 113 (05) :2533-2547
[8]   Stochastic ray theory for long-range sound propagation in deep ocean environments [J].
Brown, MG ;
Viechnicki, J .
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, 1998, 104 (04) :2090-2104
[9]   Efficient numerical stimulation of stochastic internal-wave-induced sound-speed perturbation fields [J].
Colosi, JA ;
Brown, MG .
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, 1998, 103 (04) :2232-2235
[10]   Comparisons of measured and predicted acoustic fluctuations for a 3250-km propagation experiment in the eastern North Pacific Ocean [J].
Colosi, JA ;
Scheer, EK ;
Flatté, SM ;
Cornuelle, BD ;
Dzieciuch, MA ;
Munk, WH ;
Worcester, PF ;
Howe, BM ;
Mercer, JA ;
Spindel, RC ;
Metzger, K ;
Birdsall, TG ;
Baggeroer, AB .
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, 1999, 105 (06) :3202-3218