Acoustic mode coupling due to subaqueous sand dunes in the South China Sea

被引：2

作者：

Chiu, Linus Y. S. ^{[1
]}

Reeder, D. Benjamin ^{[2
]}

机构：

[1] Natl Sun Yat Sen Univ, Inst Appl Marine Phys & Undersea Technol, Kaohsiung 80424, Taiwan

[2] Naval Postgrad Sch, Dept Oceanog, Monterey, CA 93943 USA

来源：

JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA | 2013年 / 134卷 / 02期

关键词：

PROPAGATION; SHELFBREAK;

D O I：

10.1121/1.4812862

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

摘要：

The large subaqueous sand dunes on the upper continental slope of the South China Sea are expected to couple acoustic propagating normal modes. In this letter, the criterion of adiabatic invariance is extended to the case of a waveguide possessing bedforms. Using the extended criterion to examine mode propagation over the bedforms observed in the sand dune field in 2012, results demonstrate that bedforms increase mode coupling strength such that the criterion for adiabatic propagation is exceeded for waveguides with small bedform amplitude to water depth ratios; increasing bedform amplitude enhances mode coupling. Numerical simulations confirm the extended criterion parameterization. (C) 2013 Acoustical Society of America

引用

页码：EL198 / EL204

页数：7

共 10 条

[1] An energy-conserving one-way coupled mode propagation model [J].

Abawi, AT .

JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, 2002, 111 (01) :160-167

[2] Enhanced acoustic mode coupling resulting from an internal solitary wave approaching the shelfbreak in the South China Sea [J].

Chiu, Linus Y. S. ;

Reeder, D. Benjamin ;

Chang, Yuan-Ying ;

Chen, Chi-Fang ;

Chiu, Ching-Sang ;

Lynch, James F. .

JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, 2013, 133 (03) :1306-1319

[3]

Collins M. D., 1988, 365 NORDA NAV RES LA

[4] Acoustic mode coupling by nonlinear internal wave packets in a shelfbreak front area [J].

Duda, TF .

IEEE JOURNAL OF OCEANIC ENGINEERING, 2004, 29 (01) :118-125

[5] RAY AND WAVE INVARIANTS FOR SOFAR CHANNEL PROPAGATION [J].

MILDER, DM .

JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, 1969, 46 (5P2) :1259-&

[6] EXTENSION OF METHOD OF NORMAL MODES TO SOUND PROGATION IN AN ALMOST-STRATIFIED MEDIUM [J].

PIERCE, AD .

JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, 1965, 37 (01) :19-&

[7] Coupled acoustic mode propagation through continental-shelf internal solitary waves [J].

Preisig, JC ;

Duda, TF .

IEEE JOURNAL OF OCEANIC ENGINEERING, 1997, 22 (02) :256-269

[8] Very large subaqueous sand dunes on the upper continental slope in the South China Sea generated by episodic, shoaling deep-water internal solitary waves [J].

Reeder, D. Benjamin ;

Ma, Barry B. ;

Yang, Yiing Jang .

MARINE GEOLOGY, 2011, 279 (1-4) :12-18

[9]

Shang E. C., 1993, Journal of Computational Acoustics, V1, P91, DOI 10.1142/S0218396X93000068

[10] Coupled-mode solutions in generalized ocean environments [J].

Stotts, SA .

JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, 2002, 111 (04) :1623-1643

← 1 →