浅海海洋环境噪声空间相关特性研究
文献类型：学位论文
| 作者 | 何利 |
| 学位类别 | 博士 |
| 答辩日期 | 2007-06-08 |
| 授予单位 | 中国科学院声学研究所 |
| 授予地点 | 声学研究所 |
| 关键词 | 海洋环境噪声模型 水平相关 垂直相关 |
| 其他题名 | Research on the spatial correlation of ambient noise in shallow water |
| 学位专业 | 声学 |
| 中文摘要 | 本文通过对两次海上实验记录的海洋环境噪声数据进行详细的处理，深入地研究了浅海海域海洋环境噪声场相关特性。 通过对2005年在青岛海域航道附近记录的大量海洋环境噪声数据进行水平相关特性的分析，发现用已有的噪声场模型无法解释低频噪声场水平相关特性。究其原因，海洋环境噪声场模型都假设噪声源均匀的分布在海面上，没考虑附近离散船噪声的影响，而实验海域位于航道附近，过往的船只较多。所以，本文对噪声场模型进行了改进，使得空间任意两点间的噪声场互相关函数既考虑海面均匀分布的噪声源也考虑了附近离散分布船只辐射噪声的影响。改进后的海洋环境噪声模型可很好地解释实验获得的噪声水平相关特性。 用2001年东中国海中美联合考察实验中记录的海洋环境噪声，深入分析了不同时间段噪声场的频谱特性和垂直相关特性。为了有效解释实验现象，用数值仿真的方法研究了噪声场垂直相关对声学参数的宽容性，结果表明：噪声场垂直相关随海水声速剖面，海水深度，海底声速，海底密度，海底衰减系数的变化较小；噪声源深度对低频（小于200Hz）噪声场垂直相关的影响很小，对高频噪声场影响较大；大于2度的垂直阵倾斜对噪声场垂直相关的影响较大。在此基础上，用已有海洋环境噪声模型对低频噪声场垂直相关做了合理的解释。针对已有的噪声源深度单一分布的模型无法解释实验得到的高频噪声垂直相关，提出了噪声源深度连续分布的海洋环境噪声模型。大量实验结果表明，改进后的海洋环境噪声模型可以有效地解释高频噪声场垂直相关特性。 从理论上研究了应用海洋环境噪声场提取海洋声信道特性的可能性。结果表明：噪声场中两点间的互相关函数与此两点间的格林函数具有一定的相似性，可以通过对海洋环境噪声的分析，提取海洋环境噪声场中两点间的互相关函数来获取此两点间的格林函数。 |
| 英文摘要 | By analyzing the spatial correlations of the ambient noise data measured in two experiments, the classical ambient noise model was promoted separately considering the effects of discrete near ships and the depth of noise source distribution. The feasibility of using ambient noise correlation to obtain the characteristic of the ocean waveguide is also theoretically studied. Ambient noise data measured in shallow water near a sea-route were analyzed. It is observed that, at low frequency, the horizontal correlation has an obvious difference with that predicted by the classical ambient noise model. The theoretical analyses show that this phenomenon is mainly caused by homogeneously statistically distributed sources together with discrete near shipping noise. The classical ambient noise model is promoted to include the effects of both homogeneously distributed sources and discrete near shipping sources. The promoted model can be used to forecast the ambient noise field near the sea-route. Data measured at different times are used to verify the validity of the model. Ambient noise data measured in the ASIAEX2001 were analyzed. The results show that the experimental vertical correlation is consistent with the predicted one by the classical ambient noise mode at low frequency. However, for high frequency, the predicted vertical correlation can not match the experimental result, because the vertical correlation is sensitive to source depth of noise. Considering the fact that the noise sources may distribute at different depth below sea surface, an ambient noise model with continuously distributed source is proposed. The vertical correlation predicted by the proposed model is consistent with the experimental result. |
| 语种 | 中文 |
| 公开日期 | 2011-05-07 |
| 页码 | 82 |
| 源URL | [http://159.226.59.140/handle/311008/184]  |
| 专题 | 声学研究所_声学所博硕士学位论文_1981-2009博硕士学位论文 |
| 推荐引用方式 GB/T 7714 | 何利. 浅海海洋环境噪声空间相关特性研究[D]. 声学研究所. 中国科学院声学研究所. 2007. |
入库方式： OAI收割
来源：声学研究所
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