海南岛东南外海海底沉积物特征及其声学物理性质研究
A study on seafloor sediment and its acouso-physical properties in the southeast offshore sea area of Hainan Island in China
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摘要: 分析研究了南海北部大陆架西南缘的海南岛东南外海海底沉积物声学物理特性,在多个航次中进行了海底沉积层取样、海水CTD测量、浅地层及旁侧声呐扫测等工作.在实验室里对沉积物样品进行声学参数、沉积学基本参数、物理力学参数和14C年龄测试等分析.根据多尔特曼公式求解出弹性模量、体积弹性模量、压缩系数、切变模量、泊松比和拉梅常数等六项沉积物弹性参数.分析结果表明在该海区海底沉积物的压缩波速为1.474~1.700 m/s,在不同的海区内有高低声速两类性质的沉积物分布;沉积物的切变波速为150~600 m/s;沉积物在100 kHz的声衰减为35~260 dB/m;沉积物的密度为1.4~2.0 g/cm3;沉积物的孔隙度为42%~88%.Abstract: Acouso-physical properties of seafloor sediments in the southeast offshore sea area of Hainan Island at the northern continental shelf of South China Sea are analyzed.In many cruises CTD measurements of seawater,measurments of shallow stratum and side-scan sonar have been made.Acoustic parameters, basic sedimentary parameters,physico-mechanical parameters and 14C age,etc.have been measured.Sedi-menteastic parameters,including Young's modulus,bulk modulus,constrained modulus,rigidity modulus,Poisson's ratio,Lames constant,etc.,have been calculated.Results show that the compression wave velocity of the seafloor sediment in the sea area ranges from 1.474 to 1.700 km/s,and there are high and low sound velocity sediment types in the different sea areas;the shear wave velocity is 150~600 m/s;at 100 kHz the sediment sound attenuation is 35~260 dB/m,the sediment density is 1.4~2.0 g/cm3;the sediment porosity is 42%~88%.Sound field parameters and describing sound reciprocity between sea and seafloor are described.
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