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中文核心期刊

海洋锋对浅海全波导中低频声传播特性的影响

Influence of oceanic fronts on the low-frequency sound propagation in full waveguides of the shallow sea

  • 摘要: 针对海洋锋对浅海低频声传播的影响问题, 使用有限元方法在浅海全波导声场计算模型下仿真研究了锋面性质、锋面梯度和锋面坡度对低频声传播特性的影响规律, 并利用射线声学理论给出了物理解释。研究结果表明: 负声速梯度锋面会引起声线的向下偏转, 造成声线入射海底的掠射角增大, 增强声能量向海底“泄露”效应, 而正梯度锋面的影响与之相反; 随着锋面声速梯度绝对值的下降, 负梯度锋面中声线入射海底的掠射角逐渐减小以及跨度逐渐增大, 会减弱声能量向海底的“泄露”效应, 而正梯度锋面会略微增强声能量向海底“泄露”效应; 随着锋面坡度的减小, 声线入射海底的掠射角逐渐增大且跨度减小, 从而导致声能量泄露的峰值位置向锋面倾斜的方向移动。

     

    Abstract: Aiming at the problem of the influence of the ocean front on low-frequency sound propagation in the shallow sea, based on the finite element method, the influence law of front properties, front gradient and front slope on low-frequency sound propagation characteristics is simulated and analyzed under the calculation model of full-waveguide sound field in the shallow sea, and the physical explanation is given in combination with the ray acoustic theory. The results show that the front with a negative sound velocity gradient will cause downward deflection of sound rays, increase the grazing angle of sound rays entering the seabed, and enhance the leakage effect of sound energy to the seabed, while the front with a positive gradient will have the opposite effect; With the decline of the absolute value of the front sound velocity gradient, the grazing angle of the sound line incident on the seabed in the negative gradient front gradually decreases, and the span gradually increases, which will weaken the leakage effect of sound energy to the seabed, while the positive gradient front will slightly enhance the leakage effect of sound energy to the seabed; With the decrease of the front slope, the grazing angle of the sound ray incident on the seabed increases gradually, and the span decreases, which causes the peak position of the sound energy leakage to move towards the front tilt direction.

     

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