Experimental study of the ballast in situ sediment acoustic measurement system in South China Sea

Wang, Jingqiang; Li, Guanbao; Liu, Baohua; Kan, Guangming; Sun, Zhe; Meng, Xianwei; Hua, Qingfeng

doi:10.1080/1064119x.2017.1348413

Cited by 18 publications

(8 citation statements)

References 24 publications

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“…Furthermore, the average value of three receiving channels is used to reduce measurement error. The BISAMS demonstrates stable performance and high measurement accuracy, and has been utilized in seafloor acoustic measurement expeditions in the East China Sea [17], the South China Sea [28], and the west Pacific Ocean [15].…”

Section: Methodsmentioning

confidence: 99%

“…Furthermore, the of three receiving channels is used to reduce measurement error. The BIS strates stable performance and high measurement accuracy, and has been u floor acoustic measurement expeditions in the East China Sea [17], the So [28], and the west Pacific Ocean [15]. The ratio of sediment sound speed to the seawater sound speed under perature and pressure conditions is defined as the sound speed ratio (SSR perimentally and theoretically proved to remain constant [29][30][31].…”

Section: Methodsmentioning

confidence: 99%

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Seafloor Sediment Acoustic Properties on the Continental Slope in the Northwestern South China Sea

Li,

Wang,

Meng

et al. 2024

JMSE

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The acoustic properties of seafloor sediments on continental slopes play a crucial role in underwater acoustic propagation, communication, and detection. To investigate the acoustic characteristics and spatial distribution patterns of sediments on the continental slope, a geoacoustic experiment was conducted in the northwestern South China Sea. The experiment covered two sections: one crossing the shelf and slope in the downslope direction, and the other near the shelf break in the along-slope direction. In situ techniques, sediment sampling, and laboratory measurements were used to acquire data on sediment acoustic properties (such as sound speed and attenuation) and physical properties (including particle composition, density, porosity, and mean grain size). The experimental findings revealed several key points: (1) Acoustic properties of shallow water coarse-grained sediments and deep-sea sediments were higher when measured in the laboratory compared to in situ measurements. (2) Relationships between measured attenuation and physical properties, as well as between sound speed and mean grain size, showed deviations from previous empirical equations. (3) Sediment acoustic and physical properties exhibited significant variations in the downslope direction, while showing gradual variations in the along-slope direction. These variations can be attributed to sedimentary environmental factors such as material sources, hydrodynamic conditions, and water depth.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Seafloor Sediment Acoustic Properties on the Continental Slope in the Northwestern South China Sea

Li,

Wang,

Meng

et al. 2024

JMSE

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“…The BISAMS has been introduced in detail in Wang et al (2018), as shown in Figure 1. The BISAMS uses a ballast penetrating method to insert the acoustic transducers into seafloor sediments.…”

Section: In Situ Sediment Acoustic Measurementmentioning

confidence: 99%

Measurement and Modeling of High‐Frequency Acoustic Properties in Fine Sandy Sediments

Wang

Liu

et al. 2019

Earth and Space Science

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The object of this study was to obtain the acoustic properties of fine sandy sediments with approximately 22% clay content from the East China Sea Shelf. This study conducted the in situ acoustic measurement to measure the sound speed and attenuation, and eight sediment cores were collected and measured the wet bulk density, porosity, and mean grain size in laboratory environment. The correlations between in situ sound speed ratio and physical properties show good accordance with two empirical equations, while the in situ attenuation factor deviated the regression curves. Both the sound speed ratio and the attenuation data show the obvious change against the measurement frequency. The comparisons of the measured sound speed ratio and attenuation to the Biot-Stoll model predictions were performed. The sound speed ratio dispersion agrees well with the model prediction, when the permeability and pore size were calculated using the extended Kozeny-Carman's equation and the extended Hovem's equation. The attenuation data in this study accords better with the prediction curves reported for fine sediments than that for coarse sediments from the 1999 Sediment Acoustics Experiment.

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“…Consequently, sample-based densities and shear wave velocities may not necessarily represent the in-situ sediment stiffness of shallow sediments (see data in Dai and Santamarina 2014). On the other hand, S-wave velocity measurements in the field are cumbersome and may require scuba divers or remotely operated vehicles ROVs (Hamilton et al 1970;Richardson et al 1991;Wang et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Shallow Seafloor Sediments: Density and Shear Wave Velocity

Ramirez

Park

Terzariol

et al. 2023

J. Geotech. Geoenviron. Eng.

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Near-surface seafloor properties affect offshore mining and infrastructure engineering. Shallow seafloor sediments experience extremely low effective stress, and consequently, these sediments exhibit very low in-situ density, shear wave velocity, and shear stiffness. We combined data extracted from the literature with new laboratory and field results to develop a comprehensive understanding of shallow seafloor sediments. First, we explored the sediment-dependent self-compaction characteristics starting with the asymptotic void ratio at the interface between the water column and the sediment column. The asymptotic void ratio depends on the particle size and shape in coarse-grained sediments and on mineralogy and pore fluid chemistry in fine-grained clayey sediments; overall, the asymptotic void ratio correlates with the sediment-specific surface and compressibility. Second, we developed a fork-type insertion probe to measure shear wave velocity profiles with depth. Detailed data analyses confirm the prevalent role of effective stress on shear wave velocity V s ¼ αðσ 0 m =kPaÞ β , and the inverse relationship between α and β parameters reveals that electrical interactions alter the velocity profile only in very high specific surface area sediments at very low effective stress and shows that ray bending affects the computed velocities only in the upper few centimeters (for the probe geometry used in this study). Probe insertion causes excess pore fluid pressure and effective stress changes; the ensuing time-dependent diffusion detected through shear wave velocity changes can be analyzed to estimate the coefficient of consolidation. Shear wave velocity profiles and velocity transients after insertion provide valuable information for sediment preclassification and engineering design.

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Experimental study of the ballast in situ sediment acoustic measurement system in South China Sea

Cited by 18 publications

References 24 publications

Seafloor Sediment Acoustic Properties on the Continental Slope in the Northwestern South China Sea

Seafloor Sediment Acoustic Properties on the Continental Slope in the Northwestern South China Sea

Measurement and Modeling of High‐Frequency Acoustic Properties in Fine Sandy Sediments

Shallow Seafloor Sediments: Density and Shear Wave Velocity

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