Correlations between the in situ acoustic properties and geotechnical parameters of sediments in the Yellow Sea,China |
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| Institution: | 1. National Deep Sea Center, 6 Xianxialing Road, Qingdao 266061, China;2. First Institute of Oceanography, SOA, 6 Xianxialing Road, Qingdao 266061, China;1. Environmental Geotechnical Engineering Institute, Ocean University of China, Qingdao 266100, China;2. Key Laboratory of Marine Environment & Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China;3. Key Laboratory of State Oceanic Administration for Marine Sedimentology and Environmental Geology, The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;4. Griffith School of Engineering, Griffith University Gold Coast Campus, Queensland, QLD 4222, Australia;1. Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, SOA, No. 6 Xianxialing Road, Laoshan District, Qingdao, 266061, China;2. Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, No.1 Wenhai Road, Jimo City, Qingdao, 266237, China;3. National Deep Sea Center, SOA, No. 1 Weiyang Road, Jimo City, Qingdao, 266237, China |
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| Abstract: | Knowledge about the marine sediment acoustic properties is a key to understanding wave propagation in sediments and is very important for military oceanography and ocean engineering. We developed a hydraulic-drived self-contained in situ sediment acoustic measurement system, and measured for the first time the in situ acoustic properties of sediments on 78 stations in the Yellow Sea, China, by employing this system. The relationships between the in situ measured acoustic properties and the onboard or laboratory determined geotechnical parameters were analyzed. Porosity was found to be the dominant factor in reducing velocity in a quadratic fashion; velocity showed an increment with bulk density and a decrement with mean grain size and clay content both with a nonlinear dependence; acoustic attenuation showed a bell-shaped correlation with porosity and mean grain size but reduced with clay content of the sediments. The attenuation results indicate that intergrain friction rather than viscous interactions between pore fluid and solid grains is the dominant loss mechanism in our marine sediments. The relationships established would be used to predict the geotechnical parameters from in situ measured acoustic properties and vice versa, as well as being an indicator of the seafloor processes, potential gas bubbles hazard and gas hydrates resources or other suitable targets of acoustic surveys. |
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| Keywords: | In situ Acoustic properties Marine sediments Yellow Sea |
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