Correction for effects of temperature and pressure on sound speed in shallow seafloor sediments |
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| Authors: | Guangming Kan Dapeng Zou Baohua Liu Xiangmei Meng Guanbao Li |
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| Institution: | 1. First Institute of Oceanography, SOA, Key Laboratory of Marine Sedimentology and Environmental Geology, Laoshan District, Qingdao, China;2. Qingdao Polit National Laboratory for Marine Science and Technology, Laboratory for Marine Geology, Jimo City, Qingdao, China;3. Guangdong Provincial Key Lab of Computer Integrated Manufacturing, Guangdong University of Technology, Guangzhou, China;4. Qingdao Polit National Laboratory for Marine Science and Technology, Laboratory for Marine Geology, Jimo City, Qingdao, China;5. National Deep Sea Center, SOA, Jimo District, Qingdao, China |
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| Abstract: | AbstractThree types of sediments were selected to measure their sound speed under changing temperature and pressure conditions in laboratory. The effects of temperature and pressure on sound speed in sediments and their trends were analyzed. The results showed that, with increasing temperature and pressure, the sound speed exhibits an increasing trend in all selected sediments. For each sample, the ratio of the sound speed in sediments to that in seawater almost remained unchanged at different pressures and temperatures, with a maximum fluctuation of 1.09% for temperature dependence and 0.68% pressure dependence. Combining the analysis of experimental results and sound speed correction procedure given by Hamilton, specific correction formulas of sound speed for temperature and pressure were presented. The laboratory-measured sound speed in the experiment and the sound speed obtained in the South Yellow Sea were corrected to reduce the effects of temperature and pressure using the correction formulas. The results show that the correction formulas with constant sound speed ratio are effective for correcting the sound speed measurement errors caused by changes in temperature and pressure. As a further consideration, the effects of the fluctuation of sound speed ratio on sound speed correction were analyzed. |
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| Keywords: | Seafloor sediment sound speed in situ measurement temperature pressure correction of sound speed |
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