| 摘要: |
| 采用结合匹配法和经验正交函数法的射线声层析反演方法, 针对流场水平分布不均匀特点, 使用距离等效分段方法对反演算法进行改进, 利用三个断面声层析数据, 对胶州湾口潮流场的垂直和水平分布进行反演。与传统方法比较, 大大降低与实测流速垂直分布间的偏差, 平均偏差小于0.02 m/s,流场垂直分布间的相关系数提高到0.85 以上。分析了声传播断面上不同的流场结构, 以及涨潮期间在胶州湾团岛附近出现的涡流现象, 并计算得到湾口海水流量变化。结果表明, 改进的射线声层析反演方法可有效地用于水平分布不均匀流场监测, 仅采用少量声学观测站位, 即可获得大范围的复杂流场三维信息, 有利于近海海洋资源开发、海洋环境保护和船舶航行安全。 |
| 关键词: 射线走时声层析 经验正交函数 匹配方法 距离等效分段 胶州湾 |
| DOI：10.11759/hykx20130510003 |
| 分类号: |
| 基金项目:国家海洋局第二海洋研究所卫星海洋环境动力学国家重点实验室开放基金项目(SOED1001); 国家自然科学基金项目(41176033);国家重点基础研究发展计划项目(2007CB411803); 国家高技术研究发展计划(863 计划)(2006AA09Z114) |
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| Determination of inversion current field in the Jiaozhou Bay based on coastal acoustic tomography data |
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LIU Xu-dong1, LIN Ju1, WANG Huan1, ZHU Xiao-hua2
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1.College of Information Science and Engineering, Ocean University of China;2.Second Institute of Oceanography, State Oceanic Administration
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| Abstract: |
| Based on coastal acoustic tomography data, the ray time-of-flight acoustic tomography method is combined with the matching field method and empirical orthogonal function analysis to invert the current field along three sections. The inversion method is improved using the subsection equivalent method to invert the vertical and horizontal distributions of the current in a current-range-dependent case. The deviation between the inversion results and the current measurements are considerably reduced compared with the use of the traditional inversion method; the average deviation is below 0.02 m/s, and the correlation coefficient of current vertical profile is increased to over 0.85. According to the inversion results, the current field in the acoustic experiment domain near the mouth of the Jiaozhou Bay is analyzed, and the transport volume is calculated. The results show that the modified ray time-flight acoustic tomography method can be applied to monitor current fields that have a range-dependent horizontal distribution, and the large-scale three dimensional information of the complicated current field can be obtained by deploying a small number of acoustic stations, which are useful in the studies of coastal marine resource exploitation, marine environment conservation, and shipping traffic safety. |
| Key words: ray time-of-flight acoustic tomography empirical orthogonal function matching field method subsection-equivalent method the Jiaozhou Bay |
