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首页> 外文期刊>The Journal of the Acoustical Society of America >Velocity dispersion and attenuation in granular marine sediments: Comparison of measurements with predictions using acoustic models
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Velocity dispersion and attenuation in granular marine sediments: Comparison of measurements with predictions using acoustic models

机译：颗粒状海洋沉积物中的速度散布和衰减：使用声学模型将测量结果与预测结果进行比较

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摘要

The large velocity dispersion recently reported could be explained by a gap stiffness model incorporated into the Biot model (the BIMGS model) proposed by the author. However, at high frequencies, some measured results have been reported for negative velocity dispersion and attenuation proportional to the first to fourth power of frequency. In this study, first, it is shown that the results of velocity dispersion and attenuation calculated using the BIMGS model are consistent with the results measured in two kinds of water-saturated sands with different grain sizes, except in the high-frequency range. Then, the velocity dispersion and attenuation in six kinds of water-saturated glass beads and four kinds of water-saturated silica sands with different grain sizes are measured in the frequency ranges of 80-140 and 300-700 kHz. The measured results are compared with those calculated using the BIMGS model plus some acoustic models. It is shown that the velocity dispersion and attenuation are well predicted by using the BIMGS model in the range of kd 0.5 (k: wavenumber in water, d: grain diameter) and by using the BIMGS model plus multiple scattering effects in the range of kd 0.5 in which negative velocity dispersion appears.
机译：作者最近提出的Biot模型（BIMGS模型）中包含的间隙刚度模型可以解释最近报道的大速度弥散。但是，在高频下，已经报告了一些负速度色散和衰减的测量结果，它们与频率的第一至第四次幂成比例。在本研究中，首先表明，使用BIMGS模型计算出的速度色散和衰减结果与在两种不同粒径的水饱和砂中测得的结果一致，除了在高频范围内。然后，在80-140和300-700 kHz的频率范围内，测量了六种不同粒径的水饱和玻璃珠和四种水饱和硅砂的速度色散和衰减。将测量结果与使用BIMGS模型以及一些声学模型计算得到的结果进行比较。结果表明，使用BIMGS模型在kd 0.5范围内（k：水中波数，d：晶粒直径）并使用BIMGS模型加上在kd范围内的多重散射效应，可以很好地预测速度色散和衰减0.5，其中出现负速度分散。

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