Zheng Guangying, Huang Yiwang, Hua Jian
Acoustic Science and Technology Laboratory and College of Underwater Acoustic Engineering, Harbin Engineering University, 145 Nantong Street, Harbin 150001, China.
J Acoust Soc Am. 2017 Aug;142(2):530. doi: 10.1121/1.4996440.
A predictive model for acoustic dispersion and attenuation in gassy sediments is proposed. The model combines the linear solution for gas-bubble pulsations in a viscoelastic medium with corrected Biot equations involving gas-bubble pulsations. Numerical results for sound speed and attenuation are compared with predictions from Anderson and Hampton's model to demonstrate the advantages of the proposed model. The most important advantage of the current model is that it combines the dispersion regimes associated with gas-bubble pulsations and relative motion between the pore water and solid framework. The reflection coefficient at the water/gassy-sediment interface is derived based on the current model, and numerical results show that gas-bubble resonance can lead to the highest reflection. This model can also be used with a full acoustic inversion to estimate gas-bubble size distributions.
提出了一种用于预测含气沉积物中声散射和衰减的模型。该模型将粘弹性介质中气泡脉动的线性解与包含气泡脉动的修正毕奥方程相结合。将声速和衰减的数值结果与安德森和汉普顿模型的预测结果进行比较，以证明所提模型的优势。当前模型最重要的优势在于它结合了与气泡脉动以及孔隙水和固体骨架之间相对运动相关的散射机制。基于当前模型推导了水/含气沉积物界面处的反射系数，数值结果表明气泡共振可导致最高反射。该模型还可用于全声反演以估计气泡尺寸分布。
