陆架斜坡海域上坡波导环境中声能量急剧下降现象及其定量分析
发布时间：2019-01-29 00:30
【摘要】：深度较浅的声源其辐射声波在陆架斜坡海域上坡传播时,在斜坡顶端会出现声能量急剧下降现象.利用射线声学模型分析了造成这一现象的原因,并根据抛物方程声场模型计算的深海和浅海平均传播损失定义了"声能量急剧下降距离",定量分析了声源位置对该现象的影响.结果表明:声源深度对"声能量急剧下降距离"影响较大,而声源与斜坡底端水平距离对其影响较小;当声源深度变大时,部分掠射角较小的声线最终能够达到斜坡顶端,致使"声能量急剧下降距离"增大,继续增加声源深度,将导致上坡声能量急剧下降现象消失.利用抛物方程声场模型对陆架斜坡海域上坡声传播进行数值仿真,结合"声能量急剧下降距离"的定义,计算并比较了声源位置不同时该距离的变化,数值计算结果验证了理论分析.
[Abstract]:The sound energy of the shallow source will drop sharply when the sound wave propagates up the slope of the continental shelf slope. The causes of this phenomenon are analyzed by means of the ray acoustic model, and the "sharp drop distance of sound energy" is defined according to the average propagation losses in the deep sea and shallow water calculated by the sound field model of parabolic equation. The influence of sound source location on this phenomenon is quantitatively analyzed. The results show that the depth of sound source has a great influence on the distance of sharp drop of sound energy, but the horizontal distance between the sound source and the bottom of the slope has little effect on it. When the depth of the sound source becomes larger, the acoustic lines with small grazing angle can finally reach the top of the slope, which leads to the increase of the "distance of sharp drop of sound energy" and the further increase of the depth of the sound source, which will lead to the disappearance of the phenomenon of sharp decline of the sound energy up the slope. Using the parabolic equation sound field model, the numerical simulation of the sound propagation in the upper slope of the continental shelf is carried out, and the variation of the sound source position at different time is calculated and compared by combining the definition of "sharp drop distance of sound energy". The numerical results verify the theoretical analysis.
【作者单位】： 西北工业大学海洋声学信息感知工业和信息化部重点实验室;西北工业大学航海学院;
【基金】：国家自然科学基金(批准号:11534009)资助的课题~~
【分类号】：P733.2
，
本文编号：2417461
[Abstract]:The sound energy of the shallow source will drop sharply when the sound wave propagates up the slope of the continental shelf slope. The causes of this phenomenon are analyzed by means of the ray acoustic model, and the "sharp drop distance of sound energy" is defined according to the average propagation losses in the deep sea and shallow water calculated by the sound field model of parabolic equation. The influence of sound source location on this phenomenon is quantitatively analyzed. The results show that the depth of sound source has a great influence on the distance of sharp drop of sound energy, but the horizontal distance between the sound source and the bottom of the slope has little effect on it. When the depth of the sound source becomes larger, the acoustic lines with small grazing angle can finally reach the top of the slope, which leads to the increase of the "distance of sharp drop of sound energy" and the further increase of the depth of the sound source, which will lead to the disappearance of the phenomenon of sharp decline of the sound energy up the slope. Using the parabolic equation sound field model, the numerical simulation of the sound propagation in the upper slope of the continental shelf is carried out, and the variation of the sound source position at different time is calculated and compared by combining the definition of "sharp drop distance of sound energy". The numerical results verify the theoretical analysis.
【作者单位】： 西北工业大学海洋声学信息感知工业和信息化部重点实验室;西北工业大学航海学院;
【基金】：国家自然科学基金(批准号:11534009)资助的课题~~
【分类号】：P733.2
，
本文编号：2417461
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