东海大陆斜坡海底沉积物分类研究
文献类型：学位论文
| 作者 | 赵梅 |
| 学位类别 | 博士 |
| 答辩日期 | 2009-05-14 |
| 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 | 大陆斜坡 海底沉积物分类 声学参数反演 声传播损失 代价函数 |
| 其他题名 | Research of the Seabed Sediment Classification in the Continental Slope Environment of East China Sea |
| 学位专业 | 声学 |
| 中文摘要 | 海底沉积物分类一直是海底施工、海洋矿产资源、海洋油气平台、港口码头建设、渔业资源、专属经济区界定等领域必不可少的研究内容，具有重要的军事及民用意义。对海底沉积物分类研究包括：熟悉海底沉积物的物理特性以及其中的声学特性；了解海底沉积物的类型及分类命名；重点分析和讨论海底沉积物的分类方法。本文以东海大陆斜坡为海洋环境对海底沉积物分类进行研究，并利用声学参数反演方法结合采样分析对海底沉积物进行分类。分类与命名时以谢帕德沉积物粒度三角分类法为基础，并考虑了Hamilton等人的习惯。 本文首先对海底沉积物分类进行综述，其次对海底沉积物的声学参数反演方法进行重点研究，然后基于东海大陆斜坡海上实验数据进行海底沉积物分类，最后考察了东海大陆斜坡海底沉积物分类的历史资料记录，对实验采样结果分析并分类。 在对实验海区海底沉积物分类时，采用声学参数反演方法。利用近场爆炸声源反演海底沉积物密度和声速：通过提取爆炸声源信号中的直达波和海底反射波，得到海底垂直反射系数，进而得到海底等效声阻抗，结合Hamilton的经验公式反演出海底沉积物密度和声速，反演结果与海底采样结果相符合；在已反演出海底沉积物密度和声速的情况下，由声传播损失反演海底沉积物声衰减：选取适当的代价（目标）函数，调整声衰减，使得代价函数最小，从而反演出海底沉积物声衰减，由海底沉积物声学参数反演结果计算的传播损失值与实验结果符合较好。根据海底沉积物的声学参数与类型之间的关系，利用声学参数反演结果对海底沉积物进行分类。 |
| 英文摘要 | The seabed sediment classification is always essential in the fields of seabed construction, marine mineral resources, marine oil-gas platform, harbor construction, fishery resources, exclusive economic zone definition and so on. It is of great significancy in military and civil. The research of the seabed sediment classification includes being familiar with the physical properties and acoustical properties, knowing the seabed sediment types and their naming criterion, studying the sediment classification methods. In this paper, the seabed sediment classification is studied in the continental slope environment of East China Sea. The classification and naming are based on Shepard criterion combined with the usage of Hamilton and others. In this paper, the seabed sediment classification is summarized at first, the acoustic parameters inversion methods of sediment classification are mainly studied secondly, and then the sediments are classified based on processing data from the experiment of East China Sea continental slope. At last, the historical data of sediment types on East China Sea continental slope are surveyed and the cores in the experimental area are analyzed. This paper uses acoustic parameters inversion methods to classify the seabed sediments in the experimental area. The sound velocity and density of seabed sediment are estimated by the wide-band explosive sources nearby. The vertical reflection coefficient of seabed is obtained by extracting direct wave and bottom reflection wave from the explosive source signals, the equivalent impedance of seabed is achieved accordingly, then the sound velocity and density of seabed sediment are separated by the impedance combining Hamilton’s empirical equations. The results are similar to the cores in the experimental area. The attenuation is inverted from the transmission loss once the sound velocity and density of seabed sediment have been inverted. The cost function needs to be chosen properly, because it is varied with the sediment attenuation. When the value of the cost function reaches the minimum, the estimated attenuation is inverted. The transmission loss which calculated from the inversion results is in agreement with the experimental values. When the acoustic parameters are inverted, the seabed sediments can be classified based on the close relation between the acoustic parameters and the sediment types. |
| 语种 | 中文 |
| 公开日期 | 2011-05-07 |
| 页码 | 63 |
| 源URL | [http://159.226.59.140/handle/311008/582]  |
| 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 | 赵梅. 东海大陆斜坡海底沉积物分类研究[D]. 声学研究所. 中国科学院声学研究所. 2009. |
入库方式： OAI收割
来源：声学研究所
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