Research on the sediment acoustic properties based on a water coupled laboratory measurement system |
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| Authors: | Lei Sun Xiangmei Meng Guanbao Li Guangming Kan Baohua Liu |
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| Institution: | 1. Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao, China;2. Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China;3. Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China;4. National Deep Sea Center, Ministry of Natural Resources, Qingdao, China |
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| Abstract: | AbstractThe high-frequency acoustic properties of seafloor sediments are very significant in seafloor study and underwater acoustic study field. In order to measure the sound speed and the attenuation for the small-scale sediment cores more accurately, this study developed a water coupled acoustic laboratory measurement system based on Richardson-Briggs technique. This method used the correlation comparison of waveforms received in sediment core and in identical reference tubes filled with water to measure sound speed and attenuation. The sound speed and attenuation of a clayey silt sediment sample were measured using the water coupled acoustic laboratory measurement system. This frequency dependence of the sound speed and attenuation showed that the clayey silt sediment has a weak positive sound speed dispersion, while the attenuation increases with a strong positive gradient within the measurement frequency range. This study also noted that the measured sound speed ratio match well with the empirical equations from literature. The measured attenuation factor data can fall in the Hamilton’s empirical prediction range. |
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| Keywords: | Sound speed attenuation marine sediments laboratory measurement |
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