Effect of Temperature on the Acoustic Reflection Characteristics of Seafloor Surface Sediments

Zou, Dapeng; Ye, Guican; Liu, Wei; Sun, Han; Li, Jun; Xiao, Tao

doi:10.1007/s11802-022-4874-9

Cited by 4 publications

(1 citation statement)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They are closely related to the sediment physical and mechanical properties, as well as to the measurement methods and environmental conditions. Currently, three primary methods are employed for obtaining the acoustic properties of seafloor sediments: geoacoustic inversion, laboratory acoustic measurement, and in situ acoustic measurement (Tao et al, 2006;Jackson and Richardson, 2007;Liu et al, 2019;Zou et al, 2022). Due to these methods differing in terms of measurement technology, frequency and environmental conditions, challenges arise on how to effectively apply different methods, diverse measurement datasets, and various fitting empirical equations from different sea areas.…”

Section: Introductionmentioning

confidence: 99%

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

Zou,

Xie,

Meng

et al. 2023

Front. Mar. Sci.

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%