The sound velocity and bulk properties of sediments in the Bohai Sea and the Yellow Sea of China
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The sound velocity and bulk properties of sediments in the Bohai Sea and the Yellow Sea of China ZHENG Jiewen1, 2, 3, LIU Baohua4, KAN Guangming1, 2, 3, LI Guanbao1, 2, 3, PEI Yanliang1, 2, 3, LIU Xiaolei3, 5* 1 Key Laboratory of Marine Sedimentology and Environmental Geology of State Oceanic Administration, State
Oceanic Administration, Qingdao 266061, China 2 First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China 3 Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China 4 National Deep Sea Center, State Oceanic Administration, Qingdao 266237, China 5 Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Ocean University of
China, Qingdao 266100, China Received 9 July 2015; accepted 24 September 2015 ©The Chinese Society of Oceanography and Springer-Verlag Berlin Heidelberg 2016
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. Key words: sound velocity, particle composition, physical properties, frequency dispersion, empirical equation Citation: 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, doi: 10.1007/s13131-016-0906-x
1 Introduction The structures of seabed sediment, where biological, geological, biogeochemical, and hydrodynamic processes operate, determine the typical sediment bulk properties (e.g., bulk density, water content, grain size distribution), sediment behavior (geoacoustic, and rheologic) under various stress-strain conditions, and sediment acoustic properties such as propagation and scattering of high-frequency acoustic sound in or at the sea
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