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Sound propagation from the shelfbreak to deep water

  • [设施]:实验1
  • [期刊/会议名称]:SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
  • [摘要]:Motivated by a phenomenon in an experiment conducted in the Northwestern Pacific indicating that the energy of the received signal around the sound channel axis is much greater than that at shallower depths, we study sound propagation from the transitional area (shelfbreak) to deep water. Numerical simulations with different source depths are first performed, from which we reach the following conclusions. When the source is located near the sea surface, sound will be strongly attenuated by bottom losses in a range-independent oceanic environment, whereas it can propagate to a very long range because of the continental slope. When the source is mounted on the bottom in shallow water, acoustic energy will be trapped near the sound channel axis, and it converges more evidently than the case where the source is located near the sea surface. Then, numerical simulations with different source ranges are performed. By comparing the relative energy level in the vertical direction between the numerical simulations and the experimental data, the range of the air-gun source can be approximated.
  • [发表日期]:2014
  • [第一作者]:Qin, JX
  • [第一作者单位]:中科院声学所
  • [通讯作者]:Qin, JX
  • [通讯作者单位]:中科院声学所
  • [论文类型]:期刊
  • [期刊分类]:
  • [学科分类]:
  • [影响因子]:
  • [关键词]:sound propagation; transitional area; deep water; parabolic equation
  • [卷号]:6
  • [期号]:57
  • [起止页码]:1031-1037
  • [简介]:附近和斜坡表面两种情况下斜坡分别对声传播的影响。通过数值模拟,得到了不同声源深度下的传播损失和脉冲的时域波形。数值结果表明,当声源置于海面附近时,声波在水平不变深海环境中随距离衰减很快,而大陆坡的存在可实现能量的远距离传播;当声源置于斜坡表面时,大陆坡会改变水体中声波能量的分布,使其在声道轴深度附近比较集中,这种传播条件下小掠射角声线产生的时间展宽很小。另外,仿真了不同声源距离下的传播损失。通过比较数值仿真和实验数据在垂直方向上的相对能量级,可以近似得到气枪声源的距离。