Research on the sediment acoustic properties based on a water coupled laboratory measurement system
Research on the sediment acoustic properties based on a water coupled laboratory measurement system
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基于水耦合实验室测量系统的沉积物声学特性研究
DOI：
10.1080/1064119x.2019.1605638
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发表时间：
2020
影响因子：
2.2
通讯作者：
Lu Dequan
中科院分区：
文献类型：
--
作者：
Sun Lei;Meng Xiangmei;Wang Jingqiang;Li Guanbao;Kan Guangming;Liu Baohua;Lu Dequan
摘要 海底沉积物的高频声学特性在海底研究和水声研究领域具有重要意义。为了更准确地测量小尺度沉积物岩心的声速和衰减，本研究开发了基于Richardson-Briggs技术的水耦合声学实验室测量系统。该方法利用沉积物岩心和装满水的相同参考管中接收到的波形的相关性比较来测量声速和衰减。使用水耦合声学实验室测量系统测量粘土质粉砂沉积物样品的声速和衰减。声速和衰减的频率依赖性表明，粘土质粉砂沉积物具有弱的正声速色散，而衰减在测量频率范围内以强的正梯度增加。这项研究还指出，测量的声速比与文献中的经验方程非常匹配。测量的衰减因子数据可以落在汉密尔顿的经验预测范围内。
Abstract The high-frequency acoustic properties of seafloor sediments are very significant in seafloor study and underwater acoustic study field. In order to measure the sound speed and the attenuation for the small-scale sediment cores more accurately, this study developed a water coupled acoustic laboratory measurement system based on Richardson-Briggs technique. This method used the correlation comparison of waveforms received in sediment core and in identical reference tubes filled with water to measure sound speed and attenuation. The sound speed and attenuation of a clayey silt sediment sample were measured using the water coupled acoustic laboratory measurement system. This frequency dependence of the sound speed and attenuation showed that the clayey silt sediment has a weak positive sound speed dispersion, while the attenuation increases with a strong positive gradient within the measurement frequency range. This study also noted that the measured sound speed ratio match well with the empirical equations from literature. The measured attenuation factor data can fall in the Hamilton’s empirical prediction range.