Distribution of geoacoustic properties and related influencing factors of surface sediments in the southern South China Sea
Distribution of geoacoustic properties and related influencing factors of surface sediments in the southern South China Sea
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南海南部表层沉积物地声特征分布及相关影响因素
DOI：
10.1007/s11001-016-9294-z
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发表时间：
2016
影响因子：
1.4
通讯作者：
Han Guozhong
中科院分区：
文献类型：
--
作者：
Wang Jingqiang;Guo Changsheng;Liu Baohua;Hou Zhengyu;Han Guozhong
为了对南海南部中国海区的海底沉积物进行特征描述和填图，对21个测站的海底沉积物进行了物性和地声学性质的测量和分析。在甲板上使用同轴差动测距方法测量声速，并使用实验室速度修正方法将声速修正为现场声速。结果表明，声速比和声阻抗的分布与沉积物的物理性质密切相关。将研究区划分为三个地声区：舜他陆架上的最高速度区、陆坡和南沙海槽的中低速带。声速比与物理参数之间的关系符合类似的线性关系，甚至比以前研究中得出的二次关系更好。然而，这种良好的匹配可能是由于本研究使用的数据样本范围有限。与Hamilton和Bachman或Anderson经验公式预测的声速相比，实测值较小，这可能是由于沉积环境和测量方法的不同所致。
In order to characterize and map the seafloor sediments in the southern South China Sea, the physical and geoacoustic properties of the sediments were measured and analyzed at 21 stations. Sound speeds were measured using the coaxial differential distance measurement method on deck, and were corrected to in situ sound speeds using the correction-to-laboratory-velocity method. The results show that the distributions of sound speed ratio and acoustic impedance are closely related to the sediments physical properties. The study area can be divided into 3 geoacoustic provinces: the highest speed zone on the Sunda Shelf, and the intermediate and lowest speed zones on the continental slope and Nansha Trough. The correlations between the sound speed ratio and physical parameters fit linear relationships similarly or even better than the quadratic relationships derived in previous studies. This good fit may however be due to the limited range of data samples used in this study. Compared with the predicted sound speeds from Hamilton and Bachman’s or Anderson’s empirical equations, the measured values are smaller, which is probably due to different sedimentary environments and measurement methods.