Influence of Environmental Conditions on the Sound Velocity Ratio of Seafloor Surficial Sediment

Zou, Dapeng; Zeng, Ziwen; Kan, Guangming; Liu, Wei; Xiao, Tao

doi:10.1007/s11802-021-4628-0

Cited by 6 publications

(4 citation statements)

References 36 publications

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“…These values align with the measurement datasets recorded on the continental shelf and continental slope of the North Pacific Ocean (Hamilton, 1971), the datasets in the South China Sea (SCS) (Wang et al, 2018a;Liu et al, 2019) and the datasets in the Yellow Sea (YS) (Kan et al, 2011;Liu et al, 2019). By utilizing the sound velocity ratio to analyze the relationships between acoustic and physical characteristics of different seafloor sediment types, the influence of in situ temperature variations at different measurement stations can be mitigated (Kan et al, 2019;Zou et al, 2021).…”

Section: Principle Of P-edfmmentioning

confidence: 99%

“…This analysis takes into account the impact of temperature, which is a significant factor to consider when comparing results obtained in different seasons and at various seafloor depths. Currently, there is no effective method to correct for the temperature effect on the sound attenuation coefficient, as the velocity ratio correction method is used specifically to address the impact on sound velocity (Zou et al, 2021).…”

Section: In Situ Acoustic Characteristic Analysis Based On P-edfmmentioning

confidence: 99%

“…A fixed sound velocity ratio correction method is employed to adjust the in situ temperature sate to the laboratory temperature state (Kan et al, 2019;Zou et al, 2021). The temperature-corrected in situ sound velocity values, compared with the laboratorymeasured sound velocities, are presented in Figure 4.…”

Section: Difference Of Sound Velocity Characteristics Between In Situ...mentioning

confidence: 99%

“…In situ acoustic measurement causes significantly less disturbance to seafloor sediments than laboratory acoustic measurement but with the complex process and long operation period. Furthermore, to obtain the physical characteristics of seafloor sediment and acoustic characteristics across a wider frequency range, it is necessary to collect sediment samples and transport them to the laboratory for measurement and analysis (Buckingham and Richardson, 2002;Kim et al, 2018c), conduct controlled environmental state measurement research (Kan et al, 2019;Zhou et al, 2019;Zou et al, 2021), and perform acoustic characteristic measurements at various frequencies (Zimmer et al, 2010;Yu et al, 2017;Wang et al, 2018b). The aforementioned research emphasizes the significance of factors such as physical properties of seafloor sediments, measurement frequency and measurement environmental state in understanding the differences in acoustic properties of seafloor sediments.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the variation of in situ seafloor sediments acoustic characteristics with porosity based EDFM

Zou,

Xie,

Meng

et al. 2023

Front. Mar. Sci.

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Numerous factors influence the acoustic characteristics of seafloor sediments, necessitating a comprehensive study that combines theoretical analysis, laboratory measurements and in situ measurements to support acoustic prediction and inversion. In this study, a porosity-based effective density fluid model (P-EDFM) is established to analyze the variation of acoustic properties with the porosity of seafloor sediments. On the biases of P-EDFM, the attribute of measured sound velocity and acoustic attenuation coefficient of seafloor sediment in Series 9B of the SAX99 was well interpreted within the frequency range of 25-100 kHz. The in situ measured sound velocity ratio was well predicated by the P-EDFM in the East China Sea and Yellow Sea. It reveals that the in situ sound velocity ratio decreases with increasing bulk porosity and with decreasing bulk density. The scattering and differences in the acoustic attenuation coefficient measured in situ in seafloor sediments are found to be greater than those observed for sound velocity. After considering the influence of temperature in the P-EDFM, the prediction of in situ sound velocity aligns well with the measured dataset. While, the acoustic attenuation coefficient exhibits an inflection point, increasing initially and then decreasing with changes in porosity, similar to the observed pattern in Hamilton’s observation and estimation. By incorporating temperature and frequency influences, the in situ measurements of sound velocity of seafloor sediments are corrected into laboratory sound velocities by using the P-EDFM. The result reveals the sediment samples’ sampling and transmitting process has a much greater impact on the sound velocity of sandy sediment in the East China Sea compared to muddy sediment. Overall, P-EDFM can predict the in situ sound velocity and sound attenuation coefficient under different temperatures and frequencies, with a lower prediction error for sound velocity compared to sound attenuation coefficient.

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Section: Principle Of P-edfmmentioning

confidence: 99%

Section: In Situ Acoustic Characteristic Analysis Based On P-edfmmentioning

confidence: 99%

Section: Difference Of Sound Velocity Characteristics Between In Situ...mentioning

confidence: 99%