The Key Laboratory of Underwater Environment, Institute of Acoustics, Chinese Academy of Sciences, No. 21 Bei Si Huan Xilu, Beijing 100190, China
J Acoust Soc Am. 2013 Nov;134(5):EL394-9. doi: 10.1121/1.4822421.
An inversion scheme based on time-warping is presented for estimating seabed sound attenuation from modal dispersion of close-range single-hydrophone data. The dispersion information is extracted directly from the warped signal spectrum. Seabed sound speed and density are inverted from the modal group velocity curves, and the attenuation is inverted from the normalized modal amplitudes. The method is applied to experimental data collected in the Yellow Sea of China during the winter of 2002. The inverted sound speed and density are consistent with the sand-silt-clay sediment at the site, and the attenuation is nonlinear over the frequency band from 125-500 Hz.
提出了一种基于时频弯曲的反演方法，用于从近距离单水听器数据的模态频散估计海底声衰减。频散信息直接从弯曲信号谱中提取。从模态群速度曲线反演海底声速和密度，从归一化模态幅度反演衰减。该方法应用于 2002 年冬季在中国黄海采集的实验数据。反演的声速和密度与该地点的砂-粉砂-粘土沉积物一致，衰减在 125-500 Hz 的频带内呈非线性。
