Characterization of surficial mudflat sediments using shear wave elastography, core-logging, and microscopy techniquesa).

IF 2.3 2区 物理与天体物理 Q2 ACOUSTICS
Gabriel R Venegas, Jane McCue, Yu-Hsuan Chao, Kang Kim, John M Cormack
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引用次数: 0

Abstract

Surficial sediments are highly susceptible to physical, biological, and chemical processes, which can create significant heterogeneity, affecting the transmission and scattering of elastic waves. Non-invasive medical shear wave elastography (SWE) can potentially resolve shear speed heterogeneity in this delicate surficial layer. Samples were extracted from two mudflats in New Hampshire, USA, where sound speed and attenuation were measured 1 cm below the water-sediment interface using the core and resonance logger (200 kHz-1 MHz). Subsequently, propagating shear waves (50-200 Hz) were generated using acoustic radiation force and imaged with high-frame-rate ultrasound, yielding two-dimensional shear speed maps in the top 1 cm. Finally, subsamples were imaged using a suite of microscopy techniques. SWE revealed stiff millimeter-scale inclusions with shear speeds up to 16 m/s suspended in a lower-shear-speed medium with values around 2 m/s. In the 1000-20,000 m-1 band, shear speed spatial spectral strengths are between -42 and -38 dB re 1 m and the spectral slope is 3.5. Positive shear speed depth gradients between 189 and 332 s-1 are observed, where microscopy revealed that pore and grain connectivity decreased and increased with depth, respectively. Finally, the grain shearing model was fit to measured wave parameters. Results are consistent with highly lubricated and compliant grain contacts in the presence of large volume fractions of organo-clay.

利用剪切波弹性成像、岩心测井和显微技术表征浅层泥滩沉积物。
表层沉积物极易受到物理、生物和化学过程的影响,这些过程会产生显著的非均质性,影响弹性波的传输和散射。无创医用横波弹性成像(SWE)可以潜在地解决这一微妙表层的剪切速度不均匀性。样品取自美国新罕布什尔州的两个泥滩,使用岩心和共振记录仪(200 kHz-1 MHz)测量了水-沉积物界面以下1 cm处的声速和衰减。随后,利用声辐射力产生传播剪切波(50-200 Hz),并用高帧率超声成像,得到顶部1cm的二维剪切速度图。最后,使用一套显微镜技术对子样本进行成像。SWE发现,剪切速度高达16 m/s的刚性毫米级夹杂物悬浮在剪切速度较低的介质中,剪切速度约为2 m/s。在1000 ~ 20000 m-1波段,剪切速度空间光谱强度在-42 ~ -38 dB / m之间,光谱斜率为3.5。在189 ~ 332 s-1之间观察到正的剪切速度深度梯度,显微镜观察发现孔隙和颗粒的连通性分别随着深度的增加而减少和增加。最后,将颗粒剪切模型与实测波浪参数拟合。结果表明,在存在大量有机粘土的情况下,颗粒接触具有高度润滑和柔顺性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
4.60
自引率
16.70%
发文量
1433
审稿时长
4.7 months
期刊介绍: Since 1929 The Journal of the Acoustical Society of America has been the leading source of theoretical and experimental research results in the broad interdisciplinary study of sound. Subject coverage includes: linear and nonlinear acoustics; aeroacoustics, underwater sound and acoustical oceanography; ultrasonics and quantum acoustics; architectural and structural acoustics and vibration; speech, music and noise; psychology and physiology of hearing; engineering acoustics, transduction; bioacoustics, animal bioacoustics.
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