物理学报Issue(19)：1-9,9.DOI:10.7498/aps.63.194303
浅海内波影响下的波导不变量变化特性分析
Time-varying characteristics of the waveguide invariant under internal wave condition in the shallow water area
摘要
Abstract
To explain the change of the waveguide invariantβcaused by the internal wave, the waveguide invariant is expressed as a stochastic distribution and the time-varying characteristics ofβare analyzed;then the cause and principle of variation of β are discussed in terms of the normal modes theory of the acoustic field. It turns out that the waveguide invariant shows great frequency-dependent characteristics. And in the internal wave environment, when the sound is propagated parallel to the internal wave front, the sound field’s composition of normal modes remains unchanged, but the turbulence in the group slowness and phase slowness of the main normal modes in the sound field may also change the distribution ofβ;when the sound is propagated perpendicular to the internal wave front, the coupling between acoustic normal modes might also cause obvious changes in the values ofβ.关键词
负跃层波导/内波/声场/波导不变量Key words
thermocline/internal wave/tide/sound field/waveguide invaraiant引用本文复制引用
宋文华,胡涛,郭圣明,马力..浅海内波影响下的波导不变量变化特性分析[J].物理学报,2014,(19):1-9,9.基金项目
国家自然科学基金(批准号:11004214,11274338)资助的课题.* Project supported by the National Natural Science Foundation of China (Grant Nos.11004214,11274338) （批准号:11004214,11274338）
