Abstract
Because the sound speeds of seawater and seafloor sediment both increase with temperature, the influence of temperature on the bottom reflection characteristics of seafloor sediments needs to be investigated. Based on the calculation of the temperature-controlled experimental measurement data of typical seafloor surface sediment samples, the temperature-dependent acoustic characteristics, including acoustic impedance, acoustic impedance ratio between surface sediment and seawater, and reflection coefficient, were analyzed. The effective density fluid model was used to analyze and explain the reflection coefficient variation of surface sediments with temperature and predict the dispersion characteristics. Results show that the acoustic impedance of the seabed sediment increases with temperature, whereas the acoustic impedance ratio and acoustic reflection coefficient slightly decrease. The acoustic impedance, acoustic impedance ratio, and acoustic reflection coefficient of sandy, silty, and clayey sediments vary similarly with temperature variation. Moreover, the influence of temperature on these acoustic characteristics is independent of detection frequencies.
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Acknowledgements
The authors are grateful for the invaluable support and assistance of the members of the EHIMCE Research Group, Guangdong University of Technology, and would like to especially thank Prof. Guangming Kan from the First Institute of Oceanography of Ministry of Natural Resources for his help and advice throughout the project. This study is supported by the National Natural Science Foundation of China (No. 41776043), the Natural Science Foundation of Guangdong Province (No. 2019A1515011055), the Opening Fund of the State Key Laboratory of Acoustics, Chinese Academy of Sciences (No. SKLA202105), and the Opening Fund of Qingdao National Laboratory for Marine Science and Technology (No. MGQNLM-KF201805).
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Zou, D., Ye, G., Liu, W. et al. Effect of Temperature on the Acoustic Reflection Characteristics of Seafloor Surface Sediments. J. Ocean Univ. China 21, 62–68 (2022). https://doi.org/10.1007/s11802-022-4874-9
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DOI: https://doi.org/10.1007/s11802-022-4874-9