摘要
利用数值仿真分析和总结了不同斜坡海底条件下声场水平相关性随水平间隔和传播距离的变化规律,并利用楔形简正波理论对海底倾斜引起的声场水平纵向相关变化机理进行了解释。研究结果表明,上坡和下坡地形的声场水平纵向相关性具有很大的差别。与水平海底相比,下坡海底会增加声场水平纵向相关性,上坡海底会减小声场水平纵向相关性。有效简正波之间的干涉会使得水平纵向相关出现震荡现象,上坡和下坡地形将分别使这种震荡半径减小和加大。
The sound field horizontal longitudinal correlation as a function of horizontal span and range in sloping bot-tom environment is studied by numerical simulations.The wedge mode theory is used to explain the numerical results.It is shown that there is much difference of the sound field horizontal longitudinal correlation between the up-sloping and the down-sloping sea bottoms.In comparison to a flat-bottom sound channel,the down-sloping bottom induces in-crease of the horizontal longitudinal coherence and the up-sloping one induces decrease of the horizontal longitudinal coherence.Oscillating phenomenon of the horizontal longitudinal correlations caused by the interference between normal modes is observed,and the up-sloping or down-sloping bottom will correspondingly decrease or increase the radius of the oscillation.
出处
《声学技术》
CSCD
2011年第4期311-315,共5页
Technical Acoustics
基金
国家自然科学基金资助项目(10734100)
关键词
斜坡
声场
水平纵向相关性
sloping bottom
acoustical field
horizontal longitudinal correlation
