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Acoustic characteristics of seafloor sediments in the abyssal areas of the South China Sea

机译：南海深海区海底沉积物的声学特征

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摘要

Deep-sea sediment cores were obtained from abyssal areas (water depth 4000 m) in the South China Sea (SCS) to derive acoustic characteristics by using a WSD-3 digital acoustic instrument at a frequency of 100 kHz. The compressional wave velocity (Vp) of the seafloor sediments in the central basin is differentiated into 3 provinces on the basis of the sediment properties (esp. mean grain size and velocity). Provinces 1.11 and H2 have a high compressional wave velocity and coarse particles, while the middle province L. has a low compressional wave velocity and fine particles. The results show that the distribution of Vp is related to the sediment physical properties, sediment sources and ocean current. Vertical variations in the Vp indicate that it increases with burial depth in the high-velocity province, but is complicated in the low-velocity province, reflecting that the more active or complicated sedimentary environment in province L may be affected by the topography. We proposed a laboratory sound velocity measurement method based on Hamilton sound velocity ratio method. In addition, the measurement values from this method are close to the in situ sound velocity determined by adjusting the temperature of the sediment samples.
机译：通过使用WSD-3数字声学仪器以100 kHz的频率从南中国海（SCS）的深海区域（水深> 4000 m）获得深海沉积物岩心，以得出声学特征。根据沉积物的性质（特别是平均粒径和速度），将中部盆地海底沉积物的压缩波速度（Vp）分为3个省。省份1.11和H2具有较高的压缩波速度和较粗的颗粒，而中部省份L.具有较低的压缩波速度和较细的颗粒。结果表明，Vp的分布与沉积物的物理性质，沉积物来源和洋流有关。 Vp的垂直变化表明，在高速省份，Vp随埋藏深度的增加而增加，而在低速省份，则复杂，反映了L省较为活跃或复杂的沉积环境可能受到地形的影响。我们提出了一种基于汉密尔顿声速比法的实验室声速测量方法。此外，此方法的测量值接近通过调节沉积物样品的温度确定的原位声速。

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  • 来源
    《Ocean Engineering》 |2018年第may15期|93-100|共8页
  • 作者

    Hou Zhengyu; Chen Zhong; Wang Jingqiang; Zheng Xufeng; Yan Wen; Tian Yuhang; Luo Yun;

  • 作者单位

    Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China;

    Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China;

    SOA, Inst Oceanog 1, Key Lab Seafloor Sedimentol & Environm Geol, Qingdao 266061, Peoples R China;

    Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China;

    Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China;

    Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China;

    Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Acoustic characteristics; Abyssal areas; Sound velocity ratio; South China sea;

    机译：声学特性深海区声速比南中国海;

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