Variation of temperature-dependent sound velocity in unconsolidated marine sediments: Laboratory measurements |
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| Authors: | Sora Kim Daechoul Kim Jooyoung Hahn Woo-Hun Ryang |
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| Institution: | 1. Petroleum &2. Marine Research Division, Korea Institute of Geoscience and Mineral Resources (KIGAM), Daejeon, South Korea;3. Department of Energy Resource Engineering, Pukyong National University (PKNU), Busan, South Korea;4. Department of Energy Resource Engineering, Pukyong National University (PKNU), Busan, South Korea;5. Agency for Defense Development, Jinhae, South Korea;6. Division of Science Education and Institute of Science Education, Chonbuk National University, Jeonju, South Korea |
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| Abstract: | Laboratory measurements of sound velocity in unconsolidated marine sediment were performed to establish specific correction curves between temperature and sound velocity. Cores from the Hupo Basin and the southern sea of Geumo Island were cooled and sound velocity was measured while gradually increasing temperature (from 3 to 30°C). Sediment textural and physical properties (porosity, water content, and bulk density) were measured at the same depth. Sound velocity increases with temperature for clay, mud, silt, and sand sediment, resulting in values of approximately 2.65, 2.72, 2.78, and 3.10?m/s/°C, respectively. These results are similar to those of previous studies, and differences are likely due to density, porosity, and clay contents of the sediment. Using these results, we present correction curves for sound velocity temperature dependence for each sediment texture, which can be used to correct from laboratory to in situ values to develop accurate geoacoustic model. |
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| Keywords: | In situ sound velocity laboratory sound velocity marine sediment physical property temperature correction |
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