Shear Wave Speed Dispersion Characteristics of Seafloor Sediments in the Northern South China Sea

• 作者: KAN Guangming MENG Xiangmei WANG Jingqiang CAO Guolin LI Guanbao LIU Baohua ZHI Pengyao
• 来源期刊: 中国海洋大学学报（自然科学英文版）
• 年，卷（期）: 2022,（1）
• 所属期刊栏目: Marine and Atmospheric Sciences
• 页码范围: 91-100
• 页数: 10页
• 语种: 英文

摘要

To accurately characterize the shear wave speed dispersion of seafloor sediments in the northern South China Sea, five types of sediments including silty clay, clayey silt, sandy silt, silty sand, and clayey sand were selected, on which the measurements of the shear wave speed at 0.5 – 2.0 kHz and related physical properties were performed. Results reveal that the shear wave speed of sediments increases as the frequency increases, and the dispersion enhanced in the sediments in the order of silty clay, clayey silt, sandy silt, silty sand, and clayey sand, at a linear change rate of 0.727, 0.787, 3.32, 4.893, and 6.967 m s?1 kHz?1, respectively. Through regression analysis, linear and logarithmic regression equations for the correlation between shear wave speed and frequency were established for each sediment type and the determination coefficients of regression equations indicate that the correlation is closer to a logarithmic relationship. The Grain-Shearing (GS) and Biot-Stoll models were used to calculate the shear wave speed dispersion of the five sediment types, and the comparison between theoretical prediction and measured results of shear wave speeds shows that the GS model can more accurately describe the shear wave speed dispersion characteristics of these sediments in the frequency band of 0.5 – 2.0 kHz. In the same band, the predictions obtained by using the Biot-Stoll model are significantly different from the measured data.