Acoustic characteristics of seafloor sediments in the abyssal areas of the South China Sea
Acoustic characteristics of seafloor sediments in the abyssal areas of the South China Sea
复制标题
南海深海区海底沉积物的声学特征
DOI：
10.1016/j.oceaneng.2018.03.013
复制
发表时间：
2018
影响因子：
5
通讯作者：
Luo Yun
中科院分区：
文献类型：
--
作者：
Hou Zhengyu;Chen Zhong;Wang Jingqiang;Zheng Xufeng;Yan Wen;Tian Yuhang;Luo Yun
利用频率为100 kHz的WSD-3型数字声学仪器，在南海深海（水深 > 4000 m）采集了深海沉积物岩心，分析了岩心的声学特征。根据沉积物的性质（特别是平均粒径和速度），将盆地中部海底沉积物的纵波速度（Vp）划分为3个省。H1省和H2省纵波速度高，颗粒粗，中部L省纵波速度低，颗粒细。结果表明，vpis的分布与沉积物物性、沉积物来源和洋流有关。纵向变化表明，高速区随埋深增大，低速区随埋深增大，反映了L省沉积环境较为活跃或复杂，可能受地形影响。提出了一种基于哈密顿声速比法的实验室声速测量方法。此外，该方法的测量值与通过调节沉积物样品温度测定的原位声速接近。
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 H1 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 ofVpis related to the sediment physical properties, sediment sources and ocean current. Vertical variations in theVpindicate 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.