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
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
收藏
页码:EL198 / EL204
页数:7
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