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| 原位测量技术在黄海沉积声学调查中的应用 |
| Application of in-situ measurement technique to the survey of seafloor sediment acoustic properties in the Yellow Sea |
| 投稿时间：2010-01-15 修订日期：2010-03-21 |
| DOI： |
| 中文关键词: 原位测量系统 声速 声衰减系数 海底沉积物 |
| 英文关键词:in situ measurement system, sound speed, sound attenuation coefficient, seafloor sediments |
| 基金项目:国家“863”计划项目(2008AA09Z305和2008AA09Z301);海洋公益性行业科研专项经费项目(200805008);基本科研业务费专项基金项目(2007G14) |
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| 中文摘要: |
| 介绍了最新研制的基于液压驱动贯入的自容式海底沉积声学原位测量系统及其在南黄海中部海底沉积声学调查中的应用。系统可以实现对海底沉积物声速和声衰减系数的原位测量，通过液压驱动装置将四根声学探杆匀速贯入到海底沉积物，减少了对沉积物的扰动，可按照预设的工作参数在海底全自动工作，无需甲板人员实时控制，采集的声波信号自容式存储于存储单元。系统工作水深500m，测量深度1m，测量频率30kHz，采样频率10MHz。使用该系统在南黄海中部获得了40个站位不同类型沉积物的声学特性原位测量数据，并使用CTD剖面仪对系统声速测量进行了标定，相对误差均小于0.5%，表明该系统测量数据准确、可靠。 |
| 英文摘要: |
| A novel self-contained in situ sediment acoustic measurement system based on hydraulic driving penetration and its application in the middle area of the Southern Yellow Sea are introduced in detail. The system was designed for the in situ measurement of sound speeds and attenuation coefficients of seafloor sediments. By using a hydraulic driving device, the system drives four acoustic probes into sediments at an even speed, and this decreases disturbances to sediments introduced by the penetration of acoustic probes. It can work full-automatically on the seafloor without real-time control, and the data are stored self-containedly into its storage unit. Its operating water depth and measuring depth is 500 m and 1.0 m respectively. The measuring frequency is 30 kHz, and the sampling rate of A/D converter is 10 MHz. A set of in situ sound speeds and attenuation coefficients of seafloor sediments were obtained at 40 stations in the middle area of the Southern Yellow Sea. The seawater sound speeds measured by the in situ system are calibrated according to the seawater sound speeds measured by a CTD profiler. The relative errors are less than 0.5%. The result indicates that the data measured by the in situ sediment acoustic system are accurate and credible. |
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