| ZHENG Jiewen,LIU Baohua,KAN Guangming,LI Guanbao,PEI Yanliang,LIU Xiaolei. 2016. The sound velocity and bulk properties of sediments in the Bohai Sea and the Yellow Sea of China. Acta Oceanologica Sinica, 35(7):76－86 |
| The sound velocity and bulk properties of sediments in the Bohai Sea and the Yellow Sea of China |
| 中国黄渤海沉积物声速与物理性质研究 |
| Received:July 09, 2015 Revised:September 24, 2015 |
| DOI：10.1007/s13131-016-0906-x |
| Key words:sound velocity particle composition physical properties frequency dispersion empirical equation |
| 中文关键词: 声速 粒度组分 物理性质 频散 经验关系函数 |
| 基金项目:The National Natural Science Foundation of China under contract Nos 41106061, 41506077, 41330965 and 41402253; the Specialized Research Fund of First Insititute of Oceanography under contract No. GY0215G06; the Public Science and Technology Research Funds Projects of Ocean of State Oceanic Administration under contract No. 201405032. |
| Author Name | Affiliation | E-mail | | ZHENG Jiewen | Key Laboratory of Marine Sedimentology and Environmental Geology of State Oceanic Administration, State Oceanic Administration, Qingdao 266061, China
First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China | | | LIU Baohua | Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China | | | KAN Guangming | Key Laboratory of Marine Sedimentology and Environmental Geology of State Oceanic Administration, State Oceanic Administration, Qingdao 266061, China
First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China | | | LI Guanbao | Key Laboratory of Marine Sedimentology and Environmental Geology of State Oceanic Administration, State Oceanic Administration, Qingdao 266061, China
First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China | | | PEI Yanliang | Key Laboratory of Marine Sedimentology and Environmental Geology of State Oceanic Administration, State Oceanic Administration, Qingdao 266061, China
First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China | | | LIU Xiaolei | First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
National Deep Sea Center, State Oceanic Administration, Qingdao 266237, China | xiaolei@ouc.edu.cn |
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| Abstract: |
| In order to investigate the correlation between a sound velocity and sediment bulk properties and explore the influence of frequency dependence of the sound velocity on the prediction of the sediment properties by the sound velocity, a compressional wave velocity is measured at frequencies of 25-250 kHz on marine sediment samples collected from the Bohai Sea and the Yellow Sea in laboratory, together with the geotechnical parameters of sediments. The results indicate that the sound velocity ranges from 1.232 to 1.721 km/s for the collected sediment samples with a significant dispersion within the series measuring frequency. Poorly sorted sediments are highly dispersive nearly with a positive linear relationship. The porosity shows a better negative logarithmic correlation with the sound velocity compared with other geotechnical parameters. Generally, the sound velocity increases with the increasing of the average particle size, sand content, wet and dry bulk densities, and decreasing of the clay content, and water content. An important point should be demonstrated that the higher correlation can be obtained when the measuring frequency is low within the frequency ranges from 25 to 250 kHz since the inhomogeneity of sediment properties has a more remarkably influence on the laboratory sound velocity measurement at the high frequency. |
| 中文摘要: |
| 为建立考虑沉积物声速频散效应的海洋沉积物声速与物理性质关系模型，本文基于黄渤海沉积物样品在25-250 kHz频率范围的压缩波速与土工参数的测量分析，研究了考虑沉积物声速频散效应的海洋沉积物声速与物理性质参量间的经验关系模型。研究结果表明黄渤海沉积物声速频散效应明显，在测量频率范围内，沉积物声速在1.232 km/s与1.721 km/s范围内变化。沉积物分选程度越低，声速频散现象越明显，两者近似呈负线性增长关系。与沉积物其他土工参数相比，沉积物孔隙度与声速表现出非常好的负对数函数关系。一方面，沉积物声速随平均粒径、砂粒含量、湿容重与干容重的增加而增长，随黏粒含量与含水量的降低而增长。另一方面，由于沉积物非均匀性对高频声速测量影响明显，导致低频测量声速与沉积物物理参数的经验关系函数相关程度明显高于高频声速。 |
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