Distributions and vertical variation patterns of sound speed of surface sediments in South China Sea

Wang, Jingqiang; Guo, Changsheng; Hou, Zhengyu; Fu, Yongtao; Yan, Jun

doi:10.1016/j.jseaes.2014.03.026

Cited by 24 publications

(7 citation statements)

References 28 publications

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“…We also calculated sound velocities using Buckingham's theory [28,29] and compared them with our measured data. The calculated V follows the trend of the measured data accurately over the three geographical areas (for a detailed discussion see Wang et al [30]). The Wood [31] equation outlines the layer of non-rigid sediment (consisting of mineral grains suspended in fluid), is also plotted in Figure 4.…”

Section: Sound Velocitysupporting

confidence: 57%

Seafloor Sediment Study from South China Sea: Acoustic & Physical Property Relationship

et al. 2015

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Seafloor sediments of different geographical areas in the southern South China Sea (continental shelf, continental slope, and Okinawa Trough) were gravity cored at 21 locations. Sound velocities (V) of the samples were measured at 15-cm increments immediately upon retrieval, and porosity, wet bulk density, and mean grain size were measured later in the laboratory. Empirical equations from previous studies were applied to predict V of sediment samples from the measured physical properties and it was found that the sound velocities derived from the existing equations did not closely match the measured sound velocities. Therefore empirical equations were reconstructed based on the measured data that represent the relationships between physical and acoustic properties of the different geographical area in the study area. Possible explanations for the discrepancies between the measured data and those of previous studies were investigated and found that physical properties, sediment types, geographical area, etc. are important factors that influence sound velocity. The empirical equations of this report should be preferred for prediction of sediment sound velocity for high-frequency acoustic experiments.

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Section: Sound Velocitysupporting

confidence: 57%

Seafloor Sediment Study from South China Sea: Acoustic & Physical Property Relationship

et al. 2015

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“…Several studies have shown that effective macro characteristics are an external embodiment of the microstructure, and that the macro characteristics of slope creep are affected by microstructural changes (Sun et al, 2020;Zheng et al, 2021). Muddy submarine channel slope soil is a kind of structurally soft soil, which has characteristic properties of high water content, low strength, remarkable structure deformation and longer duration (Wang et al, 2014;Wu et al, 2021). Under the action of periodic cyclic loading, a series of dynamic response processes will occur in the slope sediments and the stress will concentrate in some parts.…”

Section: Creep Mechanism Of Channel Slope Instabilitymentioning

confidence: 99%

Creep characteristics of muddy submarine channel slope instability

Cun-yong¹,

Hou²

2022

Front. Mar. Sci.

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Creep is an important factor of muddy submarine channel slope instability. In this study, a sub-bottom profiler was used to monitor the continuous internal change of a muddy submarine channel slope in the laboratory to better understand the creep characteristics and mechanism of slope instability. The creep process was analyzed according to changes in the slope internal sound intensity. The results indicate a notable change of the creep characteristics during the slope instability process. Changes in the sound intensity time series decrease with increasing slope depth, and the fluctuation depth of the vertical sound intensity series varies during the slope creep process. The creep process of slope instability can be roughly divided into four stages based on the sub-bottom profile data: an expansion stage; an unstable expansion stage; a fracture stage; and a post-fracture development stage. An adjustment of the sediment microstructure in the slope is ascribed to slope creep deformation. This study highlights the prospects of high-resolution acoustic monitoring to detect and quantify the entire creep process of muddy submarine channel slope instability, which is of great significance for the evaluation and early warning prediction of channel slope instability.

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“…The physical parameters of the sedimentary column are summarized in Table 2. The porosity and permeability were obtained by averaging the measured data of the Qiongdongnan Basin as well as some surrounding areas of the South China Sea [41,42]. The temperature and pressure are adopted from the reported data in the Northern Slope of the South China Sea [43,44].…”

Section: Physical Parameters Used In the Modelmentioning

confidence: 99%

Numerical Simulation on Authigenic Barite Formation in Marine Sediments

Shang

Tian

et al. 2019

Minerals

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Submarine cold seep and its associated authigenic minerals in sediment are meaningful to indicate the existence of underlying natural gas hydrate. The anaerobic oxidation of methane (AOM) is coupled with sulfate reduction (SR) and influences the dissolution and precipitation of barite. However, the forming mechanism of barite is not yet clearly understood. In order to investigate the forming process of authigenic barite and its relationship with methane leakage flux, based on the measured data of the Qiongdongnan Basin in the Northern slope of the South China Sea, we constructed a 1D model of a sedimentary column to reproduce the formation of barite using the numerical simulation method. The results show that the original equilibrium of barite was broken by the cold seep fluids and Ba2+ was carried upward to the sulfate-rich zone leading to the formation of barite front. When there is no flux of methane from the bottom of sediment, the barite front disappears. The relationship between methane leakage flux and authigenic minerals was also discussed. It can be concluded that high methane flux corresponds to a shallow barite front in the sediment, furthermore, the barite content first increases and then decreases as the methane flux increases. At the same time, an inverse relationship between the ratio of authigenic barite to calcite and methane flux was obtained.

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Distributions and vertical variation patterns of sound speed of surface sediments in South China Sea

Cited by 24 publications

References 28 publications

Seafloor Sediment Study from South China Sea: Acoustic & Physical Property Relationship

Seafloor Sediment Study from South China Sea: Acoustic & Physical Property Relationship

Creep characteristics of muddy submarine channel slope instability

Numerical Simulation on Authigenic Barite Formation in Marine Sediments

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